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- /* Target-dependent code for QNX Neutrino x86.
- Copyright (C) 2003-2022 Free Software Foundation, Inc.
- Contributed by QNX Software Systems Ltd.
- 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 "frame.h"
- #include "osabi.h"
- #include "regcache.h"
- #include "target.h"
- #include "i386-tdep.h"
- #include "i387-tdep.h"
- #include "nto-tdep.h"
- #include "solib.h"
- #include "solib-svr4.h"
- #ifndef X86_CPU_FXSR
- #define X86_CPU_FXSR (1L << 12)
- #endif
- /* Why 13? Look in our /usr/include/x86/context.h header at the
- x86_cpu_registers structure and you'll see an 'exx' junk register
- that is just filler. Don't ask me, ask the kernel guys. */
- #define NUM_GPREGS 13
- /* Mapping between the general-purpose registers in `struct xxx'
- format and GDB's register cache layout. */
- /* From <x86/context.h>. */
- static int i386nto_gregset_reg_offset[] =
- {
- 7 * 4, /* %eax */
- 6 * 4, /* %ecx */
- 5 * 4, /* %edx */
- 4 * 4, /* %ebx */
- 11 * 4, /* %esp */
- 2 * 4, /* %epb */
- 1 * 4, /* %esi */
- 0 * 4, /* %edi */
- 8 * 4, /* %eip */
- 10 * 4, /* %eflags */
- 9 * 4, /* %cs */
- 12 * 4, /* %ss */
- -1 /* filler */
- };
- /* Given a GDB register number REGNUM, return the offset into
- Neutrino's register structure or -1 if the register is unknown. */
- static int
- nto_reg_offset (int regnum)
- {
- if (regnum >= 0 && regnum < ARRAY_SIZE (i386nto_gregset_reg_offset))
- return i386nto_gregset_reg_offset[regnum];
- return -1;
- }
- static void
- i386nto_supply_gregset (struct regcache *regcache, char *gpregs)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- gdb_assert (tdep->gregset_reg_offset == i386nto_gregset_reg_offset);
- i386_gregset.supply_regset (&i386_gregset, regcache, -1,
- gpregs, NUM_GPREGS * 4);
- }
- static void
- i386nto_supply_fpregset (struct regcache *regcache, char *fpregs)
- {
- if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
- i387_supply_fxsave (regcache, -1, fpregs);
- else
- i387_supply_fsave (regcache, -1, fpregs);
- }
- static void
- i386nto_supply_regset (struct regcache *regcache, int regset, char *data)
- {
- switch (regset)
- {
- case NTO_REG_GENERAL:
- i386nto_supply_gregset (regcache, data);
- break;
- case NTO_REG_FLOAT:
- i386nto_supply_fpregset (regcache, data);
- break;
- }
- }
- static int
- i386nto_regset_id (int regno)
- {
- if (regno == -1)
- return NTO_REG_END;
- else if (regno < I386_NUM_GREGS)
- return NTO_REG_GENERAL;
- else if (regno < I386_NUM_GREGS + I387_NUM_REGS)
- return NTO_REG_FLOAT;
- else if (regno < I386_SSE_NUM_REGS)
- return NTO_REG_FLOAT; /* We store xmm registers in fxsave_area. */
- return -1; /* Error. */
- }
- static int
- i386nto_register_area (struct gdbarch *gdbarch,
- int regno, int regset, unsigned *off)
- {
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- *off = 0;
- if (regset == NTO_REG_GENERAL)
- {
- if (regno == -1)
- return NUM_GPREGS * 4;
- *off = nto_reg_offset (regno);
- if (*off == -1)
- return 0;
- return 4;
- }
- else if (regset == NTO_REG_FLOAT)
- {
- unsigned off_adjust, regsize, regset_size, regno_base;
- /* The following are flags indicating number in our fxsave_area. */
- int first_four = (regno >= I387_FCTRL_REGNUM (tdep)
- && regno <= I387_FISEG_REGNUM (tdep));
- int second_four = (regno > I387_FISEG_REGNUM (tdep)
- && regno <= I387_FOP_REGNUM (tdep));
- int st_reg = (regno >= I387_ST0_REGNUM (tdep)
- && regno < I387_ST0_REGNUM (tdep) + 8);
- int xmm_reg = (regno >= I387_XMM0_REGNUM (tdep)
- && regno < I387_MXCSR_REGNUM (tdep));
- if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
- {
- off_adjust = 32;
- regsize = 16;
- regset_size = 512;
- /* fxsave_area structure. */
- if (first_four)
- {
- /* fpu_control_word, fpu_status_word, fpu_tag_word, fpu_operand
- registers. */
- regsize = 2; /* Two bytes each. */
- off_adjust = 0;
- regno_base = I387_FCTRL_REGNUM (tdep);
- }
- else if (second_four)
- {
- /* fpu_ip, fpu_cs, fpu_op, fpu_ds registers. */
- regsize = 4;
- off_adjust = 8;
- regno_base = I387_FISEG_REGNUM (tdep) + 1;
- }
- else if (st_reg)
- {
- /* ST registers. */
- regsize = 16;
- off_adjust = 32;
- regno_base = I387_ST0_REGNUM (tdep);
- }
- else if (xmm_reg)
- {
- /* XMM registers. */
- regsize = 16;
- off_adjust = 160;
- regno_base = I387_XMM0_REGNUM (tdep);
- }
- else if (regno == I387_MXCSR_REGNUM (tdep))
- {
- regsize = 4;
- off_adjust = 24;
- regno_base = I387_MXCSR_REGNUM (tdep);
- }
- else
- {
- /* Whole regset. */
- gdb_assert (regno == -1);
- off_adjust = 0;
- regno_base = 0;
- regsize = regset_size;
- }
- }
- else
- {
- regset_size = 108;
- /* fsave_area structure. */
- if (first_four || second_four)
- {
- /* fpu_control_word, ... , fpu_ds registers. */
- regsize = 4;
- off_adjust = 0;
- regno_base = I387_FCTRL_REGNUM (tdep);
- }
- else if (st_reg)
- {
- /* One of ST registers. */
- regsize = 10;
- off_adjust = 7 * 4;
- regno_base = I387_ST0_REGNUM (tdep);
- }
- else
- {
- /* Whole regset. */
- gdb_assert (regno == -1);
- off_adjust = 0;
- regno_base = 0;
- regsize = regset_size;
- }
- }
- if (regno != -1)
- *off = off_adjust + (regno - regno_base) * regsize;
- else
- *off = 0;
- return regsize;
- }
- return -1;
- }
- static int
- i386nto_regset_fill (const struct regcache *regcache, int regset, char *data)
- {
- if (regset == NTO_REG_GENERAL)
- {
- int regno;
- for (regno = 0; regno < NUM_GPREGS; regno++)
- {
- int offset = nto_reg_offset (regno);
- if (offset != -1)
- regcache->raw_collect (regno, data + offset);
- }
- }
- else if (regset == NTO_REG_FLOAT)
- {
- if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
- i387_collect_fxsave (regcache, -1, data);
- else
- i387_collect_fsave (regcache, -1, data);
- }
- else
- return -1;
- return 0;
- }
- /* Return whether THIS_FRAME corresponds to a QNX Neutrino sigtramp
- routine. */
- static int
- i386nto_sigtramp_p (struct frame_info *this_frame)
- {
- CORE_ADDR pc = get_frame_pc (this_frame);
- const char *name;
- find_pc_partial_function (pc, &name, NULL, NULL);
- return name && strcmp ("__signalstub", name) == 0;
- }
- /* Assuming THIS_FRAME is a QNX Neutrino sigtramp routine, return the
- address of the associated sigcontext structure. */
- static CORE_ADDR
- i386nto_sigcontext_addr (struct frame_info *this_frame)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- gdb_byte buf[4];
- CORE_ADDR ptrctx;
- /* We store __ucontext_t addr in EDI register. */
- get_frame_register (this_frame, I386_EDI_REGNUM, buf);
- ptrctx = extract_unsigned_integer (buf, 4, byte_order);
- ptrctx += 24 /* Context pointer is at this offset. */;
- return ptrctx;
- }
- static void
- init_i386nto_ops (void)
- {
- nto_regset_id = i386nto_regset_id;
- nto_supply_gregset = i386nto_supply_gregset;
- nto_supply_fpregset = i386nto_supply_fpregset;
- nto_supply_altregset = nto_dummy_supply_regset;
- nto_supply_regset = i386nto_supply_regset;
- nto_register_area = i386nto_register_area;
- nto_regset_fill = i386nto_regset_fill;
- nto_fetch_link_map_offsets =
- svr4_ilp32_fetch_link_map_offsets;
- }
- static void
- i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- static struct target_so_ops nto_svr4_so_ops;
- /* Deal with our strange signals. */
- nto_initialize_signals ();
- /* NTO uses ELF. */
- i386_elf_init_abi (info, gdbarch);
- /* Neutrino rewinds to look more normal. Need to override the i386
- default which is [unfortunately] to decrement the PC. */
- set_gdbarch_decr_pc_after_break (gdbarch, 0);
- tdep->gregset_reg_offset = i386nto_gregset_reg_offset;
- tdep->gregset_num_regs = ARRAY_SIZE (i386nto_gregset_reg_offset);
- tdep->sizeof_gregset = NUM_GPREGS * 4;
- tdep->sigtramp_p = i386nto_sigtramp_p;
- tdep->sigcontext_addr = i386nto_sigcontext_addr;
- tdep->sc_reg_offset = i386nto_gregset_reg_offset;
- tdep->sc_num_regs = ARRAY_SIZE (i386nto_gregset_reg_offset);
- /* Setjmp()'s return PC saved in EDX (5). */
- tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */
- set_solib_svr4_fetch_link_map_offsets
- (gdbarch, svr4_ilp32_fetch_link_map_offsets);
- /* Initialize this lazily, to avoid an initialization order
- dependency on solib-svr4.c's _initialize routine. */
- if (nto_svr4_so_ops.in_dynsym_resolve_code == NULL)
- {
- nto_svr4_so_ops = svr4_so_ops;
- /* Our loader handles solib relocations differently than svr4. */
- nto_svr4_so_ops.relocate_section_addresses
- = nto_relocate_section_addresses;
- /* Supply a nice function to find our solibs. */
- nto_svr4_so_ops.find_and_open_solib
- = nto_find_and_open_solib;
- /* Our linker code is in libc. */
- nto_svr4_so_ops.in_dynsym_resolve_code
- = nto_in_dynsym_resolve_code;
- }
- set_solib_ops (gdbarch, &nto_svr4_so_ops);
- set_gdbarch_wchar_bit (gdbarch, 32);
- set_gdbarch_wchar_signed (gdbarch, 0);
- }
- void _initialize_i386nto_tdep ();
- void
- _initialize_i386nto_tdep ()
- {
- init_i386nto_ops ();
- gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO,
- i386nto_init_abi);
- gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
- nto_elf_osabi_sniffer);
- }
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