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- /* Ravenscar SPARC target support.
- Copyright (C) 2004-2022 Free Software Foundation, Inc.
- 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 "gdbcore.h"
- #include "regcache.h"
- #include "sparc-tdep.h"
- #include "inferior.h"
- #include "ravenscar-thread.h"
- #include "sparc-ravenscar-thread.h"
- #include "gdbarch.h"
- struct sparc_ravenscar_ops : public ravenscar_arch_ops
- {
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- /* Register offsets from a referenced address (exempli gratia the
- Thread_Descriptor). The referenced address depends on the register
- number. The Thread_Descriptor layout and the stack layout are documented
- in the GNAT sources, in sparc-bb.h. */
- static const int sparc_register_offsets[] =
- {
- /* G0 - G7 */
- -1, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
- /* O0 - O7 */
- 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
- /* L0 - L7 */
- 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
- /* I0 - I7 */
- 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
- /* F0 - F31 */
- 0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C,
- 0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C,
- 0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC,
- 0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC,
- /* Y PSR WIM TBR PC NPC FPSR CPSR */
- 0x40, 0x20, 0x44, -1, 0x1C, -1, 0x4C, -1
- };
- /* supply register REGNUM, which has been saved on REGISTER_ADDR, to the
- regcache. */
- static void
- supply_register_at_address (struct regcache *regcache, int regnum,
- CORE_ADDR register_addr)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- int buf_size = register_size (gdbarch, regnum);
- gdb_byte *buf;
- buf = (gdb_byte *) alloca (buf_size);
- read_memory (register_addr, buf, buf_size);
- regcache->raw_supply (regnum, buf);
- }
- /* Return true if, for a non-running thread, REGNUM has been saved on the
- stack. */
- static int
- register_on_stack_p (int regnum)
- {
- return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
- || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM);
- }
- /* Return true if, for a non-running thread, REGNUM has been saved on the
- Thread_Descriptor. */
- static int
- register_in_thread_descriptor_p (int regnum)
- {
- return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
- || (regnum == SPARC32_PSR_REGNUM)
- || (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
- || (regnum == SPARC32_Y_REGNUM)
- || (regnum == SPARC32_WIM_REGNUM)
- || (regnum == SPARC32_FSR_REGNUM)
- || (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31)
- || (regnum == SPARC32_PC_REGNUM);
- }
- /* to_fetch_registers when inferior_ptid is different from the running
- thread. */
- void
- sparc_ravenscar_ops::fetch_registers (struct regcache *regcache, int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- const int sp_regnum = gdbarch_sp_regnum (gdbarch);
- const int num_regs = gdbarch_num_regs (gdbarch);
- int current_regnum;
- CORE_ADDR current_address;
- CORE_ADDR thread_descriptor_address;
- ULONGEST stack_address;
- /* The tid is the thread_id field, which is a pointer to the thread. */
- thread_descriptor_address = (CORE_ADDR) inferior_ptid.tid ();
- /* Read the saved SP in the context buffer. */
- current_address = thread_descriptor_address
- + sparc_register_offsets [sp_regnum];
- supply_register_at_address (regcache, sp_regnum, current_address);
- regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address);
- /* Read registers. */
- for (current_regnum = 0; current_regnum < num_regs; current_regnum ++)
- {
- if (register_in_thread_descriptor_p (current_regnum))
- {
- current_address = thread_descriptor_address
- + sparc_register_offsets [current_regnum];
- supply_register_at_address (regcache, current_regnum,
- current_address);
- }
- else if (register_on_stack_p (current_regnum))
- {
- current_address = stack_address
- + sparc_register_offsets [current_regnum];
- supply_register_at_address (regcache, current_regnum,
- current_address);
- }
- }
- }
- /* to_store_registers when inferior_ptid is different from the running
- thread. */
- void
- sparc_ravenscar_ops::store_registers (struct regcache *regcache, int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- int buf_size = register_size (gdbarch, regnum);
- gdb_byte buf[buf_size];
- ULONGEST register_address;
- if (register_in_thread_descriptor_p (regnum))
- register_address =
- inferior_ptid.tid () + sparc_register_offsets [regnum];
- else if (register_on_stack_p (regnum))
- {
- regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM,
- ®ister_address);
- register_address += sparc_register_offsets [regnum];
- }
- else
- return;
- regcache->raw_collect (regnum, buf);
- write_memory (register_address,
- buf,
- buf_size);
- }
- static struct sparc_ravenscar_ops sparc_ravenscar_ops;
- /* Register ravenscar_arch_ops in GDBARCH. */
- void
- register_sparc_ravenscar_ops (struct gdbarch *gdbarch)
- {
- set_gdbarch_ravenscar_ops (gdbarch, &sparc_ravenscar_ops);
- }
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