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- /* Target-dependent code for the CSKY architecture, for GDB.
- Copyright (C) 2010-2022 Free Software Foundation, Inc.
- Contributed by C-SKY Microsystems and Mentor Graphics.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "gdbsupport/gdb_assert.h"
- #include "frame.h"
- #include "inferior.h"
- #include "symtab.h"
- #include "value.h"
- #include "gdbcmd.h"
- #include "language.h"
- #include "gdbcore.h"
- #include "symfile.h"
- #include "objfiles.h"
- #include "gdbtypes.h"
- #include "target.h"
- #include "arch-utils.h"
- #include "regcache.h"
- #include "osabi.h"
- #include "block.h"
- #include "reggroups.h"
- #include "elf/csky.h"
- #include "elf-bfd.h"
- #include "symcat.h"
- #include "sim-regno.h"
- #include "dis-asm.h"
- #include "frame-unwind.h"
- #include "frame-base.h"
- #include "trad-frame.h"
- #include "infcall.h"
- #include "floatformat.h"
- #include "remote.h"
- #include "target-descriptions.h"
- #include "dwarf2/frame.h"
- #include "user-regs.h"
- #include "valprint.h"
- #include "csky-tdep.h"
- #include "regset.h"
- #include "opcode/csky.h"
- #include <algorithm>
- #include <vector>
- /* Control debugging information emitted in this file. */
- static bool csky_debug = false;
- static const reggroup *cr_reggroup;
- static const reggroup *fr_reggroup;
- static const reggroup *vr_reggroup;
- static const reggroup *mmu_reggroup;
- static const reggroup *prof_reggroup;
- /* Convenience function to print debug messages in prologue analysis. */
- static void
- print_savedreg_msg (int regno, int offsets[], bool print_continuing)
- {
- gdb_printf (gdb_stdlog, "csky: r%d saved at offset 0x%x\n",
- regno, offsets[regno]);
- if (print_continuing)
- gdb_printf (gdb_stdlog, "csky: continuing\n");
- }
- /* Check whether the instruction at ADDR is 16-bit or not. */
- static int
- csky_pc_is_csky16 (struct gdbarch *gdbarch, CORE_ADDR addr)
- {
- gdb_byte target_mem[2];
- int status;
- unsigned int insn;
- int ret = 1;
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- status = target_read_memory (addr, target_mem, 2);
- /* Assume a 16-bit instruction if we can't read memory. */
- if (status)
- return 1;
- /* Get instruction from memory. */
- insn = extract_unsigned_integer (target_mem, 2, byte_order);
- if ((insn & CSKY_32_INSN_MASK) == CSKY_32_INSN_MASK)
- ret = 0;
- else if (insn == CSKY_BKPT_INSN)
- {
- /* Check for 32-bit bkpt instruction which is all 0. */
- status = target_read_memory (addr + 2, target_mem, 2);
- if (status)
- return 1;
- insn = extract_unsigned_integer (target_mem, 2, byte_order);
- if (insn == CSKY_BKPT_INSN)
- ret = 0;
- }
- return ret;
- }
- /* Get one instruction at ADDR and store it in INSN. Return 2 for
- a 16-bit instruction or 4 for a 32-bit instruction. */
- static int
- csky_get_insn (struct gdbarch *gdbarch, CORE_ADDR addr, unsigned int *insn)
- {
- gdb_byte target_mem[2];
- unsigned int insn_type;
- int status;
- int insn_len = 2;
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- status = target_read_memory (addr, target_mem, 2);
- if (status)
- memory_error (TARGET_XFER_E_IO, addr);
- insn_type = extract_unsigned_integer (target_mem, 2, byte_order);
- if (CSKY_32_INSN_MASK == (insn_type & CSKY_32_INSN_MASK))
- {
- status = target_read_memory (addr + 2, target_mem, 2);
- if (status)
- memory_error (TARGET_XFER_E_IO, addr);
- insn_type = ((insn_type << 16)
- | extract_unsigned_integer (target_mem, 2, byte_order));
- insn_len = 4;
- }
- *insn = insn_type;
- return insn_len;
- }
- /* Implement the read_pc gdbarch method. */
- static CORE_ADDR
- csky_read_pc (readable_regcache *regcache)
- {
- ULONGEST pc;
- regcache->cooked_read (CSKY_PC_REGNUM, &pc);
- return pc;
- }
- /* Implement the write_pc gdbarch method. */
- static void
- csky_write_pc (regcache *regcache, CORE_ADDR val)
- {
- regcache_cooked_write_unsigned (regcache, CSKY_PC_REGNUM, val);
- }
- /* C-Sky ABI register names. */
- static const char * const csky_register_names[] =
- {
- /* General registers 0 - 31. */
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
- "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
- "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
- /* DSP hilo registers 36 and 37. */
- "", "", "", "", "hi", "lo", "", "",
- /* FPU/VPU general registers 40 - 71. */
- "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7",
- "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15",
- "vr0", "vr1", "vr2", "vr3", "vr4", "vr5", "vr6", "vr7",
- "vr8", "vr9", "vr10", "vr11", "vr12", "vr13", "vr14", "vr15",
- /* Program counter 72. */
- "pc",
- /* Optional registers (ar) 73 - 88. */
- "ar0", "ar1", "ar2", "ar3", "ar4", "ar5", "ar6", "ar7",
- "ar8", "ar9", "ar10", "ar11", "ar12", "ar13", "ar14", "ar15",
- /* Control registers (cr) 89 - 119. */
- "psr", "vbr", "epsr", "fpsr", "epc", "fpc", "ss0", "ss1",
- "ss2", "ss3", "ss4", "gcr", "gsr", "cr13", "cr14", "cr15",
- "cr16", "cr17", "cr18", "cr19", "cr20", "cr21", "cr22", "cr23",
- "cr24", "cr25", "cr26", "cr27", "cr28", "cr29", "cr30", "cr31",
- /* FPU/VPU control registers 121 ~ 123. */
- /* User sp 127. */
- "fid", "fcr", "fesr", "", "", "", "usp",
- /* MMU control registers: 128 - 136. */
- "mcr0", "mcr2", "mcr3", "mcr4", "mcr6", "mcr8", "mcr29", "mcr30",
- "mcr31", "", "", "",
- /* Profiling control registers 140 - 143. */
- /* Profiling software general registers 144 - 157. */
- "profcr0", "profcr1", "profcr2", "profcr3", "profsgr0", "profsgr1",
- "profsgr2", "profsgr3", "profsgr4", "profsgr5", "profsgr6", "profsgr7",
- "profsgr8", "profsgr9", "profsgr10","profsgr11","profsgr12", "profsgr13",
- "", "",
- /* Profiling architecture general registers 160 - 174. */
- "profagr0", "profagr1", "profagr2", "profagr3", "profagr4", "profagr5",
- "profagr6", "profagr7", "profagr8", "profagr9", "profagr10","profagr11",
- "profagr12","profagr13","profagr14", "",
- /* Profiling extension general registers 176 - 188. */
- "profxgr0", "profxgr1", "profxgr2", "profxgr3", "profxgr4", "profxgr5",
- "profxgr6", "profxgr7", "profxgr8", "profxgr9", "profxgr10","profxgr11",
- "profxgr12",
- /* Control registers in bank1. */
- "", "", "", "", "", "", "", "",
- "", "", "", "", "", "", "", "",
- "cp1cr16", "cp1cr17", "cp1cr18", "cp1cr19", "cp1cr20", "", "", "",
- "", "", "", "", "", "", "", "",
- /* Control registers in bank3 (ICE). */
- "sepsr", "sevbr", "seepsr", "", "seepc", "", "nsssp", "seusp",
- "sedcr", "", "", "", "", "", "", "",
- "", "", "", "", "", "", "", "",
- "", "", "", "", "", "", "", ""
- };
- /* Implement the register_name gdbarch method. */
- static const char *
- csky_register_name (struct gdbarch *gdbarch, int reg_nr)
- {
- if (reg_nr < 0)
- return NULL;
- if (reg_nr >= gdbarch_num_regs (gdbarch))
- return NULL;
- return csky_register_names[reg_nr];
- }
- /* Construct vector type for vrx registers. */
- static struct type *
- csky_vector_type (struct gdbarch *gdbarch)
- {
- const struct builtin_type *bt = builtin_type (gdbarch);
- struct type *t;
- t = arch_composite_type (gdbarch, "__gdb_builtin_type_vec128i",
- TYPE_CODE_UNION);
- append_composite_type_field (t, "u32",
- init_vector_type (bt->builtin_int32, 4));
- append_composite_type_field (t, "u16",
- init_vector_type (bt->builtin_int16, 8));
- append_composite_type_field (t, "u8",
- init_vector_type (bt->builtin_int8, 16));
- t->set_is_vector (true);
- t->set_name ("builtin_type_vec128i");
- return t;
- }
- /* Return the GDB type object for the "standard" data type
- of data in register N. */
- static struct type *
- csky_register_type (struct gdbarch *gdbarch, int reg_nr)
- {
- /* PC, EPC, FPC is a text pointer. */
- if ((reg_nr == CSKY_PC_REGNUM) || (reg_nr == CSKY_EPC_REGNUM)
- || (reg_nr == CSKY_FPC_REGNUM))
- return builtin_type (gdbarch)->builtin_func_ptr;
- /* VBR is a data pointer. */
- if (reg_nr == CSKY_VBR_REGNUM)
- return builtin_type (gdbarch)->builtin_data_ptr;
- /* Float register has 64 bits, and only in ck810. */
- if ((reg_nr >=CSKY_FR0_REGNUM) && (reg_nr <= CSKY_FR0_REGNUM + 15))
- return arch_float_type (gdbarch, 64, "builtin_type_csky_ext",
- floatformats_ieee_double);
- /* Vector register has 128 bits, and only in ck810. */
- if ((reg_nr >= CSKY_VR0_REGNUM) && (reg_nr <= CSKY_VR0_REGNUM + 15))
- return csky_vector_type (gdbarch);
- /* Profiling general register has 48 bits, we use 64bit. */
- if ((reg_nr >= CSKY_PROFGR_REGNUM) && (reg_nr <= CSKY_PROFGR_REGNUM + 44))
- return builtin_type (gdbarch)->builtin_uint64;
- if (reg_nr == CSKY_SP_REGNUM)
- return builtin_type (gdbarch)->builtin_data_ptr;
- /* Others are 32 bits. */
- return builtin_type (gdbarch)->builtin_int32;
- }
- /* Data structure to marshall items in a dummy stack frame when
- calling a function in the inferior. */
- struct stack_item
- {
- stack_item (int len_, const gdb_byte *data_)
- : len (len_), data (data_)
- {}
- int len;
- const gdb_byte *data;
- };
- /* Implement the push_dummy_call gdbarch method. */
- static CORE_ADDR
- csky_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
- struct regcache *regcache, CORE_ADDR bp_addr,
- int nargs, struct value **args, CORE_ADDR sp,
- function_call_return_method return_method,
- CORE_ADDR struct_addr)
- {
- int argnum;
- int argreg = CSKY_ABI_A0_REGNUM;
- int last_arg_regnum = CSKY_ABI_LAST_ARG_REGNUM;
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- std::vector<stack_item> stack_items;
- /* Set the return address. For CSKY, the return breakpoint is
- always at BP_ADDR. */
- regcache_cooked_write_unsigned (regcache, CSKY_LR_REGNUM, bp_addr);
- /* The struct_return pointer occupies the first parameter
- passing register. */
- if (return_method == return_method_struct)
- {
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: struct return in %s = %s\n",
- gdbarch_register_name (gdbarch, argreg),
- paddress (gdbarch, struct_addr));
- }
- regcache_cooked_write_unsigned (regcache, argreg, struct_addr);
- argreg++;
- }
- /* Put parameters into argument registers in REGCACHE.
- In ABI argument registers are r0 through r3. */
- for (argnum = 0; argnum < nargs; argnum++)
- {
- int len;
- struct type *arg_type;
- const gdb_byte *val;
- arg_type = check_typedef (value_type (args[argnum]));
- len = TYPE_LENGTH (arg_type);
- val = value_contents (args[argnum]).data ();
- /* Copy the argument to argument registers or the dummy stack.
- Large arguments are split between registers and stack.
- If len < 4, there is no need to worry about endianness since
- the arguments will always be stored in the low address. */
- if (len < 4)
- {
- CORE_ADDR regval
- = extract_unsigned_integer (val, len, byte_order);
- regcache_cooked_write_unsigned (regcache, argreg, regval);
- argreg++;
- }
- else
- {
- while (len > 0)
- {
- int partial_len = len < 4 ? len : 4;
- if (argreg <= last_arg_regnum)
- {
- /* The argument is passed in an argument register. */
- CORE_ADDR regval
- = extract_unsigned_integer (val, partial_len,
- byte_order);
- if (byte_order == BFD_ENDIAN_BIG)
- regval <<= (4 - partial_len) * 8;
- /* Put regval into register in REGCACHE. */
- regcache_cooked_write_unsigned (regcache, argreg,
- regval);
- argreg++;
- }
- else
- {
- /* The argument should be pushed onto the dummy stack. */
- stack_items.emplace_back (4, val);
- }
- len -= partial_len;
- val += partial_len;
- }
- }
- }
- /* Transfer the dummy stack frame to the target. */
- std::vector<stack_item>::reverse_iterator iter;
- for (iter = stack_items.rbegin (); iter != stack_items.rend (); ++iter)
- {
- sp -= iter->len;
- write_memory (sp, iter->data, iter->len);
- }
- /* Finally, update the SP register. */
- regcache_cooked_write_unsigned (regcache, CSKY_SP_REGNUM, sp);
- return sp;
- }
- /* Implement the return_value gdbarch method. */
- static enum return_value_convention
- csky_return_value (struct gdbarch *gdbarch, struct value *function,
- struct type *valtype, struct regcache *regcache,
- gdb_byte *readbuf, const gdb_byte *writebuf)
- {
- CORE_ADDR regval;
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int len = TYPE_LENGTH (valtype);
- unsigned int ret_regnum = CSKY_RET_REGNUM;
- /* Csky abi specifies that return values larger than 8 bytes
- are put on the stack. */
- if (len > 8)
- return RETURN_VALUE_STRUCT_CONVENTION;
- else
- {
- if (readbuf != NULL)
- {
- ULONGEST tmp;
- /* By using store_unsigned_integer we avoid having to do
- anything special for small big-endian values. */
- regcache->cooked_read (ret_regnum, &tmp);
- store_unsigned_integer (readbuf, (len > 4 ? 4 : len),
- byte_order, tmp);
- if (len > 4)
- {
- regcache->cooked_read (ret_regnum + 1, &tmp);
- store_unsigned_integer (readbuf + 4, 4, byte_order, tmp);
- }
- }
- if (writebuf != NULL)
- {
- regval = extract_unsigned_integer (writebuf, len > 4 ? 4 : len,
- byte_order);
- regcache_cooked_write_unsigned (regcache, ret_regnum, regval);
- if (len > 4)
- {
- regval = extract_unsigned_integer ((gdb_byte *) writebuf + 4,
- 4, byte_order);
- regcache_cooked_write_unsigned (regcache, ret_regnum + 1,
- regval);
- }
- }
- return RETURN_VALUE_REGISTER_CONVENTION;
- }
- }
- /* Implement the frame_align gdbarch method.
- Adjust the address downward (direction of stack growth) so that it
- is correctly aligned for a new stack frame. */
- static CORE_ADDR
- csky_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
- {
- return align_down (addr, 4);
- }
- /* Unwind cache used for gdbarch fallback unwinder. */
- struct csky_unwind_cache
- {
- /* The stack pointer at the time this frame was created; i.e. the
- caller's stack pointer when this function was called. It is used
- to identify this frame. */
- CORE_ADDR prev_sp;
- /* The frame base for this frame is just prev_sp - frame size.
- FRAMESIZE is the distance from the frame pointer to the
- initial stack pointer. */
- int framesize;
- /* The register used to hold the frame pointer for this frame. */
- int framereg;
- /* Saved register offsets. */
- trad_frame_saved_reg *saved_regs;
- };
- /* Do prologue analysis, returning the PC of the first instruction
- after the function prologue. */
- static CORE_ADDR
- csky_analyze_prologue (struct gdbarch *gdbarch,
- CORE_ADDR start_pc,
- CORE_ADDR limit_pc,
- CORE_ADDR end_pc,
- struct frame_info *this_frame,
- struct csky_unwind_cache *this_cache,
- lr_type_t lr_type)
- {
- CORE_ADDR addr;
- unsigned int insn, rn;
- int framesize = 0;
- int stacksize = 0;
- int register_offsets[CSKY_NUM_GREGS_SAVED_GREGS];
- int insn_len;
- /* For adjusting fp. */
- int is_fp_saved = 0;
- int adjust_fp = 0;
- /* REGISTER_OFFSETS will contain offsets from the top of the frame
- (NOT the frame pointer) for the various saved registers, or -1
- if the register is not saved. */
- for (rn = 0; rn < CSKY_NUM_GREGS_SAVED_GREGS; rn++)
- register_offsets[rn] = -1;
- /* Analyze the prologue. Things we determine from analyzing the
- prologue include the size of the frame and which registers are
- saved (and where). */
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: Scanning prologue: start_pc = 0x%x,"
- "limit_pc = 0x%x\n", (unsigned int) start_pc,
- (unsigned int) limit_pc);
- }
- /* Default to 16 bit instruction. */
- insn_len = 2;
- stacksize = 0;
- for (addr = start_pc; addr < limit_pc; addr += insn_len)
- {
- /* Get next insn. */
- insn_len = csky_get_insn (gdbarch, addr, &insn);
- /* Check if 32 bit. */
- if (insn_len == 4)
- {
- /* subi32 sp,sp oimm12. */
- if (CSKY_32_IS_SUBI0 (insn))
- {
- /* Got oimm12. */
- int offset = CSKY_32_SUBI_IMM (insn);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: got subi sp,%d; continuing\n",
- offset);
- }
- stacksize += offset;
- continue;
- }
- /* stm32 ry-rz,(sp). */
- else if (CSKY_32_IS_STMx0 (insn))
- {
- /* Spill register(s). */
- int start_register;
- int reg_count;
- int offset;
- /* BIG WARNING! The CKCore ABI does not restrict functions
- to taking only one stack allocation. Therefore, when
- we save a register, we record the offset of where it was
- saved relative to the current stacksize. This will
- then give an offset from the SP upon entry to our
- function. Remember, stacksize is NOT constant until
- we're done scanning the prologue. */
- start_register = CSKY_32_STM_VAL_REGNUM (insn);
- reg_count = CSKY_32_STM_SIZE (insn);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: got stm r%d-r%d,(sp)\n",
- start_register,
- start_register + reg_count);
- }
- for (rn = start_register, offset = 0;
- rn <= start_register + reg_count;
- rn++, offset += 4)
- {
- register_offsets[rn] = stacksize - offset;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: r%d saved at 0x%x"
- " (offset %d)\n",
- rn, register_offsets[rn],
- offset);
- }
- }
- if (csky_debug)
- gdb_printf (gdb_stdlog, "csky: continuing\n");
- continue;
- }
- /* stw ry,(sp,disp). */
- else if (CSKY_32_IS_STWx0 (insn))
- {
- /* Spill register: see note for IS_STM above. */
- int disp;
- rn = CSKY_32_ST_VAL_REGNUM (insn);
- disp = CSKY_32_ST_OFFSET (insn);
- register_offsets[rn] = stacksize - disp;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- else if (CSKY_32_IS_MOV_FP_SP (insn))
- {
- /* SP is saved to FP reg, means code afer prologue may
- modify SP. */
- is_fp_saved = 1;
- adjust_fp = stacksize;
- continue;
- }
- else if (CSKY_32_IS_MFCR_EPSR (insn))
- {
- unsigned int insn2;
- addr += 4;
- int mfcr_regnum = insn & 0x1f;
- insn_len = csky_get_insn (gdbarch, addr, &insn2);
- if (insn_len == 2)
- {
- int stw_regnum = (insn2 >> 5) & 0x7;
- if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_EPSR_REGNUM. */
- rn = CSKY_NUM_GREGS;
- offset = CSKY_16_STWx0_OFFSET (insn2);
- register_offsets[rn] = stacksize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- else
- {
- /* INSN_LEN == 4. */
- int stw_regnum = (insn2 >> 21) & 0x1f;
- if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_EPSR_REGNUM. */
- rn = CSKY_NUM_GREGS;
- offset = CSKY_32_ST_OFFSET (insn2);
- register_offsets[rn] = framesize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- }
- else if (CSKY_32_IS_MFCR_FPSR (insn))
- {
- unsigned int insn2;
- addr += 4;
- int mfcr_regnum = insn & 0x1f;
- insn_len = csky_get_insn (gdbarch, addr, &insn2);
- if (insn_len == 2)
- {
- int stw_regnum = (insn2 >> 5) & 0x7;
- if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum
- == stw_regnum))
- {
- int offset;
- /* CSKY_FPSR_REGNUM. */
- rn = CSKY_NUM_GREGS + 1;
- offset = CSKY_16_STWx0_OFFSET (insn2);
- register_offsets[rn] = stacksize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- else
- {
- /* INSN_LEN == 4. */
- int stw_regnum = (insn2 >> 21) & 0x1f;
- if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_FPSR_REGNUM. */
- rn = CSKY_NUM_GREGS + 1;
- offset = CSKY_32_ST_OFFSET (insn2);
- register_offsets[rn] = framesize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- }
- else if (CSKY_32_IS_MFCR_EPC (insn))
- {
- unsigned int insn2;
- addr += 4;
- int mfcr_regnum = insn & 0x1f;
- insn_len = csky_get_insn (gdbarch, addr, &insn2);
- if (insn_len == 2)
- {
- int stw_regnum = (insn2 >> 5) & 0x7;
- if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_EPC_REGNUM. */
- rn = CSKY_NUM_GREGS + 2;
- offset = CSKY_16_STWx0_OFFSET (insn2);
- register_offsets[rn] = stacksize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- else
- {
- /* INSN_LEN == 4. */
- int stw_regnum = (insn2 >> 21) & 0x1f;
- if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_EPC_REGNUM. */
- rn = CSKY_NUM_GREGS + 2;
- offset = CSKY_32_ST_OFFSET (insn2);
- register_offsets[rn] = framesize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- }
- else if (CSKY_32_IS_MFCR_FPC (insn))
- {
- unsigned int insn2;
- addr += 4;
- int mfcr_regnum = insn & 0x1f;
- insn_len = csky_get_insn (gdbarch, addr, &insn2);
- if (insn_len == 2)
- {
- int stw_regnum = (insn2 >> 5) & 0x7;
- if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_FPC_REGNUM. */
- rn = CSKY_NUM_GREGS + 3;
- offset = CSKY_16_STWx0_OFFSET (insn2);
- register_offsets[rn] = stacksize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- else
- {
- /* INSN_LEN == 4. */
- int stw_regnum = (insn2 >> 21) & 0x1f;
- if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum))
- {
- int offset;
- /* CSKY_FPC_REGNUM. */
- rn = CSKY_NUM_GREGS + 3;
- offset = CSKY_32_ST_OFFSET (insn2);
- register_offsets[rn] = framesize - offset;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- break;
- }
- }
- else if (CSKY_32_IS_PUSH (insn))
- {
- /* Push for 32_bit. */
- if (CSKY_32_IS_PUSH_R29 (insn))
- {
- stacksize += 4;
- register_offsets[29] = stacksize;
- if (csky_debug)
- print_savedreg_msg (29, register_offsets, false);
- }
- if (CSKY_32_PUSH_LIST2 (insn))
- {
- int num = CSKY_32_PUSH_LIST2 (insn);
- int tmp = 0;
- stacksize += num * 4;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: push regs_array: r16-r%d\n",
- 16 + num - 1);
- }
- for (rn = 16; rn <= 16 + num - 1; rn++)
- {
- register_offsets[rn] = stacksize - tmp;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: r%d saved at 0x%x"
- " (offset %d)\n", rn,
- register_offsets[rn], tmp);
- }
- tmp += 4;
- }
- }
- if (CSKY_32_IS_PUSH_R15 (insn))
- {
- stacksize += 4;
- register_offsets[15] = stacksize;
- if (csky_debug)
- print_savedreg_msg (15, register_offsets, false);
- }
- if (CSKY_32_PUSH_LIST1 (insn))
- {
- int num = CSKY_32_PUSH_LIST1 (insn);
- int tmp = 0;
- stacksize += num * 4;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: push regs_array: r4-r%d\n",
- 4 + num - 1);
- }
- for (rn = 4; rn <= 4 + num - 1; rn++)
- {
- register_offsets[rn] = stacksize - tmp;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: r%d saved at 0x%x"
- " (offset %d)\n", rn,
- register_offsets[rn], tmp);
- }
- tmp += 4;
- }
- }
- framesize = stacksize;
- if (csky_debug)
- gdb_printf (gdb_stdlog, "csky: continuing\n");
- continue;
- }
- else if (CSKY_32_IS_LRW4 (insn) || CSKY_32_IS_MOVI4 (insn)
- || CSKY_32_IS_MOVIH4 (insn) || CSKY_32_IS_BMASKI4 (insn))
- {
- int adjust = 0;
- int offset = 0;
- unsigned int insn2;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: looking at large frame\n");
- }
- if (CSKY_32_IS_LRW4 (insn))
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int literal_addr = (addr + ((insn & 0xffff) << 2))
- & 0xfffffffc;
- adjust = read_memory_unsigned_integer (literal_addr, 4,
- byte_order);
- }
- else if (CSKY_32_IS_MOVI4 (insn))
- adjust = (insn & 0xffff);
- else if (CSKY_32_IS_MOVIH4 (insn))
- adjust = (insn & 0xffff) << 16;
- else
- {
- /* CSKY_32_IS_BMASKI4 (insn). */
- adjust = (1 << (((insn & 0x3e00000) >> 21) + 1)) - 1;
- }
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: base stacksize=0x%x\n", adjust);
- /* May have zero or more insns which modify r4. */
- gdb_printf (gdb_stdlog,
- "csky: looking for r4 adjusters...\n");
- }
- offset = 4;
- insn_len = csky_get_insn (gdbarch, addr + offset, &insn2);
- while (CSKY_IS_R4_ADJUSTER (insn2))
- {
- if (CSKY_32_IS_ADDI4 (insn2))
- {
- int imm = (insn2 & 0xfff) + 1;
- adjust += imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: addi r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_SUBI4 (insn2))
- {
- int imm = (insn2 & 0xfff) + 1;
- adjust -= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: subi r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_NOR4 (insn2))
- {
- adjust = ~adjust;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: nor r4,r4,r4\n");
- }
- }
- else if (CSKY_32_IS_ROTLI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- int temp = adjust >> (32 - imm);
- adjust <<= imm;
- adjust |= temp;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: rotli r4,r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_LISI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- adjust <<= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: lsli r4,r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_BSETI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- adjust |= (1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bseti r4,r4 %d\n", imm);
- }
- }
- else if (CSKY_32_IS_BCLRI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- adjust &= ~(1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bclri r4,r4 %d\n", imm);
- }
- }
- else if (CSKY_32_IS_IXH4 (insn2))
- {
- adjust *= 3;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: ixh r4,r4,r4\n");
- }
- }
- else if (CSKY_32_IS_IXW4 (insn2))
- {
- adjust *= 5;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: ixw r4,r4,r4\n");
- }
- }
- else if (CSKY_16_IS_ADDI4 (insn2))
- {
- int imm = (insn2 & 0xff) + 1;
- adjust += imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: addi r4,%d\n", imm);
- }
- }
- else if (CSKY_16_IS_SUBI4 (insn2))
- {
- int imm = (insn2 & 0xff) + 1;
- adjust -= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: subi r4,%d\n", imm);
- }
- }
- else if (CSKY_16_IS_NOR4 (insn2))
- {
- adjust = ~adjust;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: nor r4,r4\n");
- }
- }
- else if (CSKY_16_IS_BSETI4 (insn2))
- {
- int imm = (insn2 & 0x1f);
- adjust |= (1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bseti r4, %d\n", imm);
- }
- }
- else if (CSKY_16_IS_BCLRI4 (insn2))
- {
- int imm = (insn2 & 0x1f);
- adjust &= ~(1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bclri r4, %d\n", imm);
- }
- }
- else if (CSKY_16_IS_LSLI4 (insn2))
- {
- int imm = (insn2 & 0x1f);
- adjust <<= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: lsli r4,r4, %d\n", imm);
- }
- }
- offset += insn_len;
- insn_len = csky_get_insn (gdbarch, addr + offset, &insn2);
- };
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog, "csky: done looking for"
- " r4 adjusters\n");
- }
- /* If the next insn adjusts the stack pointer, we keep
- everything; if not, we scrap it and we've found the
- end of the prologue. */
- if (CSKY_IS_SUBU4 (insn2))
- {
- addr += offset;
- stacksize += adjust;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: found stack adjustment of"
- " 0x%x bytes.\n", adjust);
- gdb_printf (gdb_stdlog,
- "csky: skipping to new address %s\n",
- core_addr_to_string_nz (addr));
- gdb_printf (gdb_stdlog,
- "csky: continuing\n");
- }
- continue;
- }
- /* None of these instructions are prologue, so don't touch
- anything. */
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: no subu sp,sp,r4; NOT altering"
- " stacksize.\n");
- }
- break;
- }
- }
- else
- {
- /* insn_len != 4. */
- /* subi.sp sp,disp. */
- if (CSKY_16_IS_SUBI0 (insn))
- {
- int offset = CSKY_16_SUBI_IMM (insn);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: got subi r0,%d; continuing\n",
- offset);
- }
- stacksize += offset;
- continue;
- }
- /* stw.16 rz,(sp,disp). */
- else if (CSKY_16_IS_STWx0 (insn))
- {
- /* Spill register: see note for IS_STM above. */
- int disp;
- rn = CSKY_16_ST_VAL_REGNUM (insn);
- disp = CSKY_16_ST_OFFSET (insn);
- register_offsets[rn] = stacksize - disp;
- if (csky_debug)
- print_savedreg_msg (rn, register_offsets, true);
- continue;
- }
- else if (CSKY_16_IS_MOV_FP_SP (insn))
- {
- /* SP is saved to FP reg, means prologue may modify SP. */
- is_fp_saved = 1;
- adjust_fp = stacksize;
- continue;
- }
- else if (CSKY_16_IS_PUSH (insn))
- {
- /* Push for 16_bit. */
- int offset = 0;
- if (CSKY_16_IS_PUSH_R15 (insn))
- {
- stacksize += 4;
- register_offsets[15] = stacksize;
- if (csky_debug)
- print_savedreg_msg (15, register_offsets, false);
- offset += 4;
- }
- if (CSKY_16_PUSH_LIST1 (insn))
- {
- int num = CSKY_16_PUSH_LIST1 (insn);
- int tmp = 0;
- stacksize += num * 4;
- offset += num * 4;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: push regs_array: r4-r%d\n",
- 4 + num - 1);
- }
- for (rn = 4; rn <= 4 + num - 1; rn++)
- {
- register_offsets[rn] = stacksize - tmp;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: r%d saved at 0x%x"
- " (offset %d)\n", rn,
- register_offsets[rn], offset);
- }
- tmp += 4;
- }
- }
- framesize = stacksize;
- if (csky_debug)
- gdb_printf (gdb_stdlog, "csky: continuing\n");
- continue;
- }
- else if (CSKY_16_IS_LRW4 (insn) || CSKY_16_IS_MOVI4 (insn))
- {
- int adjust = 0;
- unsigned int insn2;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: looking at large frame\n");
- }
- if (CSKY_16_IS_LRW4 (insn))
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int offset = ((insn & 0x300) >> 3) | (insn & 0x1f);
- int literal_addr = (addr + ( offset << 2)) & 0xfffffffc;
- adjust = read_memory_unsigned_integer (literal_addr, 4,
- byte_order);
- }
- else
- {
- /* CSKY_16_IS_MOVI4 (insn). */
- adjust = (insn & 0xff);
- }
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: base stacksize=0x%x\n", adjust);
- }
- /* May have zero or more instructions which modify r4. */
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: looking for r4 adjusters...\n");
- }
- int offset = 2;
- insn_len = csky_get_insn (gdbarch, addr + offset, &insn2);
- while (CSKY_IS_R4_ADJUSTER (insn2))
- {
- if (CSKY_32_IS_ADDI4 (insn2))
- {
- int imm = (insn2 & 0xfff) + 1;
- adjust += imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: addi r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_SUBI4 (insn2))
- {
- int imm = (insn2 & 0xfff) + 1;
- adjust -= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: subi r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_NOR4 (insn2))
- {
- adjust = ~adjust;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: nor r4,r4,r4\n");
- }
- }
- else if (CSKY_32_IS_ROTLI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- int temp = adjust >> (32 - imm);
- adjust <<= imm;
- adjust |= temp;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: rotli r4,r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_LISI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- adjust <<= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: lsli r4,r4,%d\n", imm);
- }
- }
- else if (CSKY_32_IS_BSETI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- adjust |= (1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bseti r4,r4 %d\n", imm);
- }
- }
- else if (CSKY_32_IS_BCLRI4 (insn2))
- {
- int imm = ((insn2 >> 21) & 0x1f);
- adjust &= ~(1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bclri r4,r4 %d\n", imm);
- }
- }
- else if (CSKY_32_IS_IXH4 (insn2))
- {
- adjust *= 3;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: ixh r4,r4,r4\n");
- }
- }
- else if (CSKY_32_IS_IXW4 (insn2))
- {
- adjust *= 5;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: ixw r4,r4,r4\n");
- }
- }
- else if (CSKY_16_IS_ADDI4 (insn2))
- {
- int imm = (insn2 & 0xff) + 1;
- adjust += imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: addi r4,%d\n", imm);
- }
- }
- else if (CSKY_16_IS_SUBI4 (insn2))
- {
- int imm = (insn2 & 0xff) + 1;
- adjust -= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: subi r4,%d\n", imm);
- }
- }
- else if (CSKY_16_IS_NOR4 (insn2))
- {
- adjust = ~adjust;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: nor r4,r4\n");
- }
- }
- else if (CSKY_16_IS_BSETI4 (insn2))
- {
- int imm = (insn2 & 0x1f);
- adjust |= (1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bseti r4, %d\n", imm);
- }
- }
- else if (CSKY_16_IS_BCLRI4 (insn2))
- {
- int imm = (insn2 & 0x1f);
- adjust &= ~(1 << imm);
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: bclri r4, %d\n", imm);
- }
- }
- else if (CSKY_16_IS_LSLI4 (insn2))
- {
- int imm = (insn2 & 0x1f);
- adjust <<= imm;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog,
- "csky: lsli r4,r4, %d\n", imm);
- }
- }
- offset += insn_len;
- insn_len = csky_get_insn (gdbarch, addr + offset, &insn2);
- };
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog, "csky: "
- "done looking for r4 adjusters\n");
- }
- /* If the next instruction adjusts the stack pointer, we keep
- everything; if not, we scrap it and we've found the end
- of the prologue. */
- if (CSKY_IS_SUBU4 (insn2))
- {
- addr += offset;
- stacksize += adjust;
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog, "csky: "
- "found stack adjustment of 0x%x"
- " bytes.\n", adjust);
- gdb_printf (gdb_stdlog, "csky: "
- "skipping to new address %s\n",
- core_addr_to_string_nz (addr));
- gdb_printf (gdb_stdlog, "csky: continuing\n");
- }
- continue;
- }
- /* None of these instructions are prologue, so don't touch
- anything. */
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog, "csky: no subu sp,r4; "
- "NOT altering stacksize.\n");
- }
- break;
- }
- }
- /* This is not a prologue instruction, so stop here. */
- if (csky_debug)
- {
- gdb_printf (gdb_stdlog, "csky: insn is not a prologue"
- " insn -- ending scan\n");
- }
- break;
- }
- if (this_cache)
- {
- CORE_ADDR unwound_fp;
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- this_cache->framesize = framesize;
- if (is_fp_saved)
- {
- this_cache->framereg = CSKY_FP_REGNUM;
- unwound_fp = get_frame_register_unsigned (this_frame,
- this_cache->framereg);
- this_cache->prev_sp = unwound_fp + adjust_fp;
- }
- else
- {
- this_cache->framereg = CSKY_SP_REGNUM;
- unwound_fp = get_frame_register_unsigned (this_frame,
- this_cache->framereg);
- this_cache->prev_sp = unwound_fp + stacksize;
- }
- /* Note where saved registers are stored. The offsets in
- REGISTER_OFFSETS are computed relative to the top of the frame. */
- for (rn = 0; rn < CSKY_NUM_GREGS; rn++)
- {
- if (register_offsets[rn] >= 0)
- {
- this_cache->saved_regs[rn].set_addr (this_cache->prev_sp
- - register_offsets[rn]);
- if (csky_debug)
- {
- CORE_ADDR rn_value = read_memory_unsigned_integer (
- this_cache->saved_regs[rn].addr (), 4, byte_order);
- gdb_printf (gdb_stdlog, "Saved register %s "
- "stored at 0x%08lx, value=0x%08lx\n",
- csky_register_names[rn],
- (unsigned long)
- this_cache->saved_regs[rn].addr (),
- (unsigned long) rn_value);
- }
- }
- }
- if (lr_type == LR_TYPE_EPC)
- {
- /* rte || epc . */
- this_cache->saved_regs[CSKY_PC_REGNUM]
- = this_cache->saved_regs[CSKY_EPC_REGNUM];
- }
- else if (lr_type == LR_TYPE_FPC)
- {
- /* rfi || fpc . */
- this_cache->saved_regs[CSKY_PC_REGNUM]
- = this_cache->saved_regs[CSKY_FPC_REGNUM];
- }
- else
- {
- this_cache->saved_regs[CSKY_PC_REGNUM]
- = this_cache->saved_regs[CSKY_LR_REGNUM];
- }
- }
- return addr;
- }
- /* Detect whether PC is at a point where the stack frame has been
- destroyed. */
- static int
- csky_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
- {
- unsigned int insn;
- CORE_ADDR addr;
- CORE_ADDR func_start, func_end;
- if (!find_pc_partial_function (pc, NULL, &func_start, &func_end))
- return 0;
- bool fp_saved = false;
- int insn_len;
- for (addr = func_start; addr < func_end; addr += insn_len)
- {
- /* Get next insn. */
- insn_len = csky_get_insn (gdbarch, addr, &insn);
- if (insn_len == 2)
- {
- /* Is sp is saved to fp. */
- if (CSKY_16_IS_MOV_FP_SP (insn))
- fp_saved = true;
- /* If sp was saved to fp and now being restored from
- fp then it indicates the start of epilog. */
- else if (fp_saved && CSKY_16_IS_MOV_SP_FP (insn))
- return pc >= addr;
- }
- }
- return 0;
- }
- /* Implement the skip_prologue gdbarch hook. */
- static CORE_ADDR
- csky_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
- {
- CORE_ADDR func_addr, func_end;
- const int default_search_limit = 128;
- /* See if we can find the end of the prologue using the symbol table. */
- if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- {
- CORE_ADDR post_prologue_pc
- = skip_prologue_using_sal (gdbarch, func_addr);
- if (post_prologue_pc != 0)
- return std::max (pc, post_prologue_pc);
- }
- else
- func_end = pc + default_search_limit;
- /* Find the end of prologue. Default lr_type. */
- return csky_analyze_prologue (gdbarch, pc, func_end, func_end,
- NULL, NULL, LR_TYPE_R15);
- }
- /* Implement the breakpoint_kind_from_pc gdbarch method. */
- static int
- csky_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
- {
- if (csky_pc_is_csky16 (gdbarch, *pcptr))
- return CSKY_INSN_SIZE16;
- else
- return CSKY_INSN_SIZE32;
- }
- /* Implement the sw_breakpoint_from_kind gdbarch method. */
- static const gdb_byte *
- csky_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
- {
- *size = kind;
- if (kind == CSKY_INSN_SIZE16)
- {
- static gdb_byte csky_16_breakpoint[] = { 0, 0 };
- return csky_16_breakpoint;
- }
- else
- {
- static gdb_byte csky_32_breakpoint[] = { 0, 0, 0, 0 };
- return csky_32_breakpoint;
- }
- }
- /* Implement the memory_insert_breakpoint gdbarch method. */
- static int
- csky_memory_insert_breakpoint (struct gdbarch *gdbarch,
- struct bp_target_info *bp_tgt)
- {
- int val;
- const unsigned char *bp;
- gdb_byte bp_write_record1[] = { 0, 0, 0, 0 };
- gdb_byte bp_write_record2[] = { 0, 0, 0, 0 };
- gdb_byte bp_record[] = { 0, 0, 0, 0 };
- /* Sanity-check bp_address. */
- if (bp_tgt->reqstd_address % 2)
- warning (_("Invalid breakpoint address 0x%x is an odd number."),
- (unsigned int) bp_tgt->reqstd_address);
- scoped_restore restore_memory
- = make_scoped_restore_show_memory_breakpoints (1);
- /* Determine appropriate breakpoint_kind for this address. */
- bp_tgt->kind = csky_breakpoint_kind_from_pc (gdbarch,
- &bp_tgt->reqstd_address);
- /* Save the memory contents. */
- bp_tgt->shadow_len = bp_tgt->kind;
- /* Fill bp_tgt->placed_address. */
- bp_tgt->placed_address = bp_tgt->reqstd_address;
- if (bp_tgt->kind == CSKY_INSN_SIZE16)
- {
- if ((bp_tgt->reqstd_address % 4) == 0)
- {
- /* Read two bytes. */
- val = target_read_memory (bp_tgt->reqstd_address,
- bp_tgt->shadow_contents, 2);
- if (val)
- return val;
- /* Read two bytes. */
- val = target_read_memory (bp_tgt->reqstd_address + 2,
- bp_record, 2);
- if (val)
- return val;
- /* Write the breakpoint. */
- bp_write_record1[2] = bp_record[0];
- bp_write_record1[3] = bp_record[1];
- bp = bp_write_record1;
- val = target_write_raw_memory (bp_tgt->reqstd_address, bp,
- CSKY_WR_BKPT_MODE);
- }
- else
- {
- val = target_read_memory (bp_tgt->reqstd_address,
- bp_tgt->shadow_contents, 2);
- if (val)
- return val;
- val = target_read_memory (bp_tgt->reqstd_address - 2,
- bp_record, 2);
- if (val)
- return val;
- /* Write the breakpoint. */
- bp_write_record1[0] = bp_record[0];
- bp_write_record1[1] = bp_record[1];
- bp = bp_write_record1;
- val = target_write_raw_memory (bp_tgt->reqstd_address - 2,
- bp, CSKY_WR_BKPT_MODE);
- }
- }
- else
- {
- if (bp_tgt->placed_address % 4 == 0)
- {
- val = target_read_memory (bp_tgt->reqstd_address,
- bp_tgt->shadow_contents,
- CSKY_WR_BKPT_MODE);
- if (val)
- return val;
- /* Write the breakpoint. */
- bp = bp_write_record1;
- val = target_write_raw_memory (bp_tgt->reqstd_address,
- bp, CSKY_WR_BKPT_MODE);
- }
- else
- {
- val = target_read_memory (bp_tgt->reqstd_address,
- bp_tgt->shadow_contents,
- CSKY_WR_BKPT_MODE);
- if (val)
- return val;
- val = target_read_memory (bp_tgt->reqstd_address - 2,
- bp_record, 2);
- if (val)
- return val;
- val = target_read_memory (bp_tgt->reqstd_address + 4,
- bp_record + 2, 2);
- if (val)
- return val;
- bp_write_record1[0] = bp_record[0];
- bp_write_record1[1] = bp_record[1];
- bp_write_record2[2] = bp_record[2];
- bp_write_record2[3] = bp_record[3];
- /* Write the breakpoint. */
- bp = bp_write_record1;
- val = target_write_raw_memory (bp_tgt->reqstd_address - 2, bp,
- CSKY_WR_BKPT_MODE);
- if (val)
- return val;
- /* Write the breakpoint. */
- bp = bp_write_record2;
- val = target_write_raw_memory (bp_tgt->reqstd_address + 2, bp,
- CSKY_WR_BKPT_MODE);
- }
- }
- return val;
- }
- /* Restore the breakpoint shadow_contents to the target. */
- static int
- csky_memory_remove_breakpoint (struct gdbarch *gdbarch,
- struct bp_target_info *bp_tgt)
- {
- int val;
- gdb_byte bp_record[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
- /* Different for shadow_len 2 or 4. */
- if (bp_tgt->shadow_len == 2)
- {
- /* Do word-sized writes on word-aligned boundaries and read
- padding bytes as necessary. */
- if (bp_tgt->reqstd_address % 4 == 0)
- {
- val = target_read_memory (bp_tgt->reqstd_address + 2,
- bp_record + 2, 2);
- if (val)
- return val;
- bp_record[0] = bp_tgt->shadow_contents[0];
- bp_record[1] = bp_tgt->shadow_contents[1];
- return target_write_raw_memory (bp_tgt->reqstd_address,
- bp_record, CSKY_WR_BKPT_MODE);
- }
- else
- {
- val = target_read_memory (bp_tgt->reqstd_address - 2,
- bp_record, 2);
- if (val)
- return val;
- bp_record[2] = bp_tgt->shadow_contents[0];
- bp_record[3] = bp_tgt->shadow_contents[1];
- return target_write_raw_memory (bp_tgt->reqstd_address - 2,
- bp_record, CSKY_WR_BKPT_MODE);
- }
- }
- else
- {
- /* Do word-sized writes on word-aligned boundaries and read
- padding bytes as necessary. */
- if (bp_tgt->placed_address % 4 == 0)
- {
- return target_write_raw_memory (bp_tgt->reqstd_address,
- bp_tgt->shadow_contents,
- CSKY_WR_BKPT_MODE);
- }
- else
- {
- val = target_read_memory (bp_tgt->reqstd_address - 2,
- bp_record, 2);
- if (val)
- return val;
- val = target_read_memory (bp_tgt->reqstd_address + 4,
- bp_record+6, 2);
- if (val)
- return val;
- bp_record[2] = bp_tgt->shadow_contents[0];
- bp_record[3] = bp_tgt->shadow_contents[1];
- bp_record[4] = bp_tgt->shadow_contents[2];
- bp_record[5] = bp_tgt->shadow_contents[3];
- return target_write_raw_memory (bp_tgt->reqstd_address - 2,
- bp_record,
- CSKY_WR_BKPT_MODE * 2);
- }
- }
- }
- /* Determine link register type. */
- static lr_type_t
- csky_analyze_lr_type (struct gdbarch *gdbarch,
- CORE_ADDR start_pc, CORE_ADDR end_pc)
- {
- CORE_ADDR addr;
- unsigned int insn, insn_len;
- insn_len = 2;
- for (addr = start_pc; addr < end_pc; addr += insn_len)
- {
- insn_len = csky_get_insn (gdbarch, addr, &insn);
- if (insn_len == 4)
- {
- if (CSKY_32_IS_MFCR_EPSR (insn) || CSKY_32_IS_MFCR_EPC (insn)
- || CSKY_32_IS_RTE (insn))
- return LR_TYPE_EPC;
- }
- else if (CSKY_32_IS_MFCR_FPSR (insn) || CSKY_32_IS_MFCR_FPC (insn)
- || CSKY_32_IS_RFI (insn))
- return LR_TYPE_FPC;
- else if (CSKY_32_IS_JMP (insn) || CSKY_32_IS_BR (insn)
- || CSKY_32_IS_JMPIX (insn) || CSKY_32_IS_JMPI (insn))
- return LR_TYPE_R15;
- else
- {
- /* 16 bit instruction. */
- if (CSKY_16_IS_JMP (insn) || CSKY_16_IS_BR (insn)
- || CSKY_16_IS_JMPIX (insn))
- return LR_TYPE_R15;
- }
- }
- return LR_TYPE_R15;
- }
- /* Heuristic unwinder. */
- static struct csky_unwind_cache *
- csky_frame_unwind_cache (struct frame_info *this_frame)
- {
- CORE_ADDR prologue_start, prologue_end, func_end, prev_pc, block_addr;
- struct csky_unwind_cache *cache;
- const struct block *bl;
- unsigned long func_size = 0;
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- unsigned int sp_regnum = CSKY_SP_REGNUM;
- /* Default lr type is r15. */
- lr_type_t lr_type = LR_TYPE_R15;
- cache = FRAME_OBSTACK_ZALLOC (struct csky_unwind_cache);
- cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- /* Assume there is no frame until proven otherwise. */
- cache->framereg = sp_regnum;
- cache->framesize = 0;
- prev_pc = get_frame_pc (this_frame);
- block_addr = get_frame_address_in_block (this_frame);
- if (find_pc_partial_function (block_addr, NULL, &prologue_start,
- &func_end) == 0)
- /* We couldn't find a function containing block_addr, so bail out
- and hope for the best. */
- return cache;
- /* Get the (function) symbol matching prologue_start. */
- bl = block_for_pc (prologue_start);
- if (bl != NULL)
- func_size = bl->endaddr - bl->startaddr;
- else
- {
- struct bound_minimal_symbol msymbol
- = lookup_minimal_symbol_by_pc (prologue_start);
- if (msymbol.minsym != NULL)
- func_size = MSYMBOL_SIZE (msymbol.minsym);
- }
- /* If FUNC_SIZE is 0 we may have a special-case use of lr
- e.g. exception or interrupt. */
- if (func_size == 0)
- lr_type = csky_analyze_lr_type (gdbarch, prologue_start, func_end);
- prologue_end = std::min (func_end, prev_pc);
- /* Analyze the function prologue. */
- csky_analyze_prologue (gdbarch, prologue_start, prologue_end,
- func_end, this_frame, cache, lr_type);
- /* gdbarch_sp_regnum contains the value and not the address. */
- cache->saved_regs[sp_regnum].set_value (cache->prev_sp);
- return cache;
- }
- /* Implement the this_id function for the normal unwinder. */
- static void
- csky_frame_this_id (struct frame_info *this_frame,
- void **this_prologue_cache, struct frame_id *this_id)
- {
- struct csky_unwind_cache *cache;
- struct frame_id id;
- if (*this_prologue_cache == NULL)
- *this_prologue_cache = csky_frame_unwind_cache (this_frame);
- cache = (struct csky_unwind_cache *) *this_prologue_cache;
- /* This marks the outermost frame. */
- if (cache->prev_sp == 0)
- return;
- id = frame_id_build (cache->prev_sp, get_frame_func (this_frame));
- *this_id = id;
- }
- /* Implement the prev_register function for the normal unwinder. */
- static struct value *
- csky_frame_prev_register (struct frame_info *this_frame,
- void **this_prologue_cache, int regnum)
- {
- struct csky_unwind_cache *cache;
- if (*this_prologue_cache == NULL)
- *this_prologue_cache = csky_frame_unwind_cache (this_frame);
- cache = (struct csky_unwind_cache *) *this_prologue_cache;
- return trad_frame_get_prev_register (this_frame, cache->saved_regs,
- regnum);
- }
- /* Data structures for the normal prologue-analysis-based
- unwinder. */
- static const struct frame_unwind csky_unwind_cache = {
- "cski prologue",
- NORMAL_FRAME,
- default_frame_unwind_stop_reason,
- csky_frame_this_id,
- csky_frame_prev_register,
- NULL,
- default_frame_sniffer,
- NULL,
- NULL
- };
- static int
- csky_stub_unwind_sniffer (const struct frame_unwind *self,
- struct frame_info *this_frame,
- void **this_prologue_cache)
- {
- CORE_ADDR addr_in_block;
- addr_in_block = get_frame_address_in_block (this_frame);
- if (find_pc_partial_function (addr_in_block, NULL, NULL, NULL) == 0
- || in_plt_section (addr_in_block))
- return 1;
- return 0;
- }
- static struct csky_unwind_cache *
- csky_make_stub_cache (struct frame_info *this_frame)
- {
- struct csky_unwind_cache *cache;
- cache = FRAME_OBSTACK_ZALLOC (struct csky_unwind_cache);
- cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- cache->prev_sp = get_frame_register_unsigned (this_frame, CSKY_SP_REGNUM);
- return cache;
- }
- static void
- csky_stub_this_id (struct frame_info *this_frame,
- void **this_cache,
- struct frame_id *this_id)
- {
- struct csky_unwind_cache *cache;
- if (*this_cache == NULL)
- *this_cache = csky_make_stub_cache (this_frame);
- cache = (struct csky_unwind_cache *) *this_cache;
- /* Our frame ID for a stub frame is the current SP and LR. */
- *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame));
- }
- static struct value *
- csky_stub_prev_register (struct frame_info *this_frame,
- void **this_cache,
- int prev_regnum)
- {
- struct csky_unwind_cache *cache;
- if (*this_cache == NULL)
- *this_cache = csky_make_stub_cache (this_frame);
- cache = (struct csky_unwind_cache *) *this_cache;
- /* If we are asked to unwind the PC, then return the LR. */
- if (prev_regnum == CSKY_PC_REGNUM)
- {
- CORE_ADDR lr;
- lr = frame_unwind_register_unsigned (this_frame, CSKY_LR_REGNUM);
- return frame_unwind_got_constant (this_frame, prev_regnum, lr);
- }
- if (prev_regnum == CSKY_SP_REGNUM)
- return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp);
- return trad_frame_get_prev_register (this_frame, cache->saved_regs,
- prev_regnum);
- }
- static frame_unwind csky_stub_unwind = {
- "csky stub",
- NORMAL_FRAME,
- default_frame_unwind_stop_reason,
- csky_stub_this_id,
- csky_stub_prev_register,
- NULL,
- csky_stub_unwind_sniffer
- };
- /* Implement the this_base, this_locals, and this_args hooks
- for the normal unwinder. */
- static CORE_ADDR
- csky_frame_base_address (struct frame_info *this_frame, void **this_cache)
- {
- struct csky_unwind_cache *cache;
- if (*this_cache == NULL)
- *this_cache = csky_frame_unwind_cache (this_frame);
- cache = (struct csky_unwind_cache *) *this_cache;
- return cache->prev_sp - cache->framesize;
- }
- static const struct frame_base csky_frame_base = {
- &csky_unwind_cache,
- csky_frame_base_address,
- csky_frame_base_address,
- csky_frame_base_address
- };
- /* Initialize register access method. */
- static void
- csky_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
- struct dwarf2_frame_state_reg *reg,
- struct frame_info *this_frame)
- {
- if (regnum == gdbarch_pc_regnum (gdbarch))
- reg->how = DWARF2_FRAME_REG_RA;
- else if (regnum == gdbarch_sp_regnum (gdbarch))
- reg->how = DWARF2_FRAME_REG_CFA;
- }
- /* Create csky register groups. */
- static void
- csky_init_reggroup ()
- {
- cr_reggroup = reggroup_new ("cr", USER_REGGROUP);
- fr_reggroup = reggroup_new ("fr", USER_REGGROUP);
- vr_reggroup = reggroup_new ("vr", USER_REGGROUP);
- mmu_reggroup = reggroup_new ("mmu", USER_REGGROUP);
- prof_reggroup = reggroup_new ("profiling", USER_REGGROUP);
- }
- /* Add register groups into reggroup list. */
- static void
- csky_add_reggroups (struct gdbarch *gdbarch)
- {
- reggroup_add (gdbarch, cr_reggroup);
- reggroup_add (gdbarch, fr_reggroup);
- reggroup_add (gdbarch, vr_reggroup);
- reggroup_add (gdbarch, mmu_reggroup);
- reggroup_add (gdbarch, prof_reggroup);
- }
- /* Return the groups that a CSKY register can be categorised into. */
- static int
- csky_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
- const struct reggroup *reggroup)
- {
- int raw_p;
- if (gdbarch_register_name (gdbarch, regnum) == NULL
- || gdbarch_register_name (gdbarch, regnum)[0] == '\0')
- return 0;
- if (reggroup == all_reggroup)
- return 1;
- raw_p = regnum < gdbarch_num_regs (gdbarch);
- if (reggroup == save_reggroup || reggroup == restore_reggroup)
- return raw_p;
- if (((regnum >= CSKY_R0_REGNUM) && (regnum <= CSKY_R0_REGNUM + 31))
- && (reggroup == general_reggroup))
- return 1;
- if (((regnum == CSKY_PC_REGNUM)
- || ((regnum >= CSKY_CR0_REGNUM)
- && (regnum <= CSKY_CR0_REGNUM + 30)))
- && (reggroup == cr_reggroup))
- return 2;
- if ((((regnum >= CSKY_VR0_REGNUM) && (regnum <= CSKY_VR0_REGNUM + 15))
- || ((regnum >= CSKY_VCR0_REGNUM)
- && (regnum <= CSKY_VCR0_REGNUM + 2)))
- && (reggroup == vr_reggroup))
- return 3;
- if (((regnum >= CSKY_MMU_REGNUM) && (regnum <= CSKY_MMU_REGNUM + 8))
- && (reggroup == mmu_reggroup))
- return 4;
- if (((regnum >= CSKY_PROFCR_REGNUM)
- && (regnum <= CSKY_PROFCR_REGNUM + 48))
- && (reggroup == prof_reggroup))
- return 5;
- if ((((regnum >= CSKY_FR0_REGNUM) && (regnum <= CSKY_FR0_REGNUM + 15))
- || ((regnum >= CSKY_VCR0_REGNUM) && (regnum <= CSKY_VCR0_REGNUM + 2)))
- && (reggroup == fr_reggroup))
- return 6;
- return 0;
- }
- /* Implement the dwarf2_reg_to_regnum gdbarch method. */
- static int
- csky_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int dw_reg)
- {
- if (dw_reg < 0 || dw_reg >= CSKY_NUM_REGS)
- return -1;
- return dw_reg;
- }
- /* Override interface for command: info register. */
- static void
- csky_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file,
- struct frame_info *frame, int regnum, int all)
- {
- /* Call default print_registers_info function. */
- default_print_registers_info (gdbarch, file, frame, regnum, all);
- /* For command: info register. */
- if (regnum == -1 && all == 0)
- {
- default_print_registers_info (gdbarch, file, frame,
- CSKY_PC_REGNUM, 0);
- default_print_registers_info (gdbarch, file, frame,
- CSKY_EPC_REGNUM, 0);
- default_print_registers_info (gdbarch, file, frame,
- CSKY_CR0_REGNUM, 0);
- default_print_registers_info (gdbarch, file, frame,
- CSKY_EPSR_REGNUM, 0);
- }
- return;
- }
- /* Initialize the current architecture based on INFO. If possible,
- re-use an architecture from ARCHES, which is a list of
- architectures already created during this debugging session.
- Called at program startup, when reading a core file, and when
- reading a binary file. */
- static struct gdbarch *
- csky_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
- {
- struct gdbarch *gdbarch;
- /* Find a candidate among the list of pre-declared architectures. */
- arches = gdbarch_list_lookup_by_info (arches, &info);
- if (arches != NULL)
- return arches->gdbarch;
- /* None found, create a new architecture from the information
- provided. */
- csky_gdbarch_tdep *tdep = new csky_gdbarch_tdep;
- gdbarch = gdbarch_alloc (&info, tdep);
- /* Target data types. */
- set_gdbarch_ptr_bit (gdbarch, 32);
- set_gdbarch_addr_bit (gdbarch, 32);
- set_gdbarch_short_bit (gdbarch, 16);
- set_gdbarch_int_bit (gdbarch, 32);
- set_gdbarch_long_bit (gdbarch, 32);
- set_gdbarch_long_long_bit (gdbarch, 64);
- set_gdbarch_float_bit (gdbarch, 32);
- set_gdbarch_double_bit (gdbarch, 64);
- set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
- set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
- /* Information about the target architecture. */
- set_gdbarch_return_value (gdbarch, csky_return_value);
- set_gdbarch_breakpoint_kind_from_pc (gdbarch, csky_breakpoint_kind_from_pc);
- set_gdbarch_sw_breakpoint_from_kind (gdbarch, csky_sw_breakpoint_from_kind);
- /* Register architecture. */
- set_gdbarch_num_regs (gdbarch, CSKY_NUM_REGS);
- set_gdbarch_pc_regnum (gdbarch, CSKY_PC_REGNUM);
- set_gdbarch_sp_regnum (gdbarch, CSKY_SP_REGNUM);
- set_gdbarch_register_name (gdbarch, csky_register_name);
- set_gdbarch_register_type (gdbarch, csky_register_type);
- set_gdbarch_read_pc (gdbarch, csky_read_pc);
- set_gdbarch_write_pc (gdbarch, csky_write_pc);
- set_gdbarch_print_registers_info (gdbarch, csky_print_registers_info);
- csky_add_reggroups (gdbarch);
- set_gdbarch_register_reggroup_p (gdbarch, csky_register_reggroup_p);
- set_gdbarch_stab_reg_to_regnum (gdbarch, csky_dwarf_reg_to_regnum);
- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, csky_dwarf_reg_to_regnum);
- dwarf2_frame_set_init_reg (gdbarch, csky_dwarf2_frame_init_reg);
- /* Functions to analyze frames. */
- frame_base_set_default (gdbarch, &csky_frame_base);
- set_gdbarch_skip_prologue (gdbarch, csky_skip_prologue);
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_frame_align (gdbarch, csky_frame_align);
- set_gdbarch_stack_frame_destroyed_p (gdbarch, csky_stack_frame_destroyed_p);
- /* Functions handling dummy frames. */
- set_gdbarch_push_dummy_call (gdbarch, csky_push_dummy_call);
- /* Frame unwinders. Use DWARF debug info if available,
- otherwise use our own unwinder. */
- dwarf2_append_unwinders (gdbarch);
- frame_unwind_append_unwinder (gdbarch, &csky_stub_unwind);
- frame_unwind_append_unwinder (gdbarch, &csky_unwind_cache);
- /* Breakpoints. */
- set_gdbarch_memory_insert_breakpoint (gdbarch,
- csky_memory_insert_breakpoint);
- set_gdbarch_memory_remove_breakpoint (gdbarch,
- csky_memory_remove_breakpoint);
- /* Hook in ABI-specific overrides, if they have been registered. */
- gdbarch_init_osabi (info, gdbarch);
- /* Support simple overlay manager. */
- set_gdbarch_overlay_update (gdbarch, simple_overlay_update);
- set_gdbarch_char_signed (gdbarch, 0);
- return gdbarch;
- }
- void _initialize_csky_tdep ();
- void
- _initialize_csky_tdep ()
- {
- register_gdbarch_init (bfd_arch_csky, csky_gdbarch_init);
- csky_init_reggroup ();
- /* Allow debugging this file's internals. */
- add_setshow_boolean_cmd ("csky", class_maintenance, &csky_debug,
- _("Set C-Sky debugging."),
- _("Show C-Sky debugging."),
- _("When on, C-Sky specific debugging is enabled."),
- NULL,
- NULL,
- &setdebuglist, &showdebuglist);
- }
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