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- /* Low level interface to ptrace, for the remote server for GDB.
- Copyright (C) 1995-2022 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 "server.h"
- #include "linux-low.h"
- #include "nat/gdb_ptrace.h"
- #include "gdb_proc_service.h"
- /* The stack pointer is offset from the stack frame by a BIAS of 2047
- (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
- hosts, so undefine it first. */
- #undef BIAS
- #define BIAS 2047
- #ifdef HAVE_SYS_REG_H
- #include <sys/reg.h>
- #endif
- #define INSN_SIZE 4
- #define SPARC_R_REGS_NUM 32
- #define SPARC_F_REGS_NUM 48
- #define SPARC_CONTROL_REGS_NUM 6
- #define sparc_num_regs \
- (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
- /* Linux target op definitions for the SPARC architecture. */
- class sparc_target : public linux_process_target
- {
- public:
- const regs_info *get_regs_info () override;
- const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
- protected:
- void low_arch_setup () override;
- bool low_cannot_fetch_register (int regno) override;
- bool low_cannot_store_register (int regno) override;
- bool low_supports_breakpoints () override;
- CORE_ADDR low_get_pc (regcache *regcache) override;
- /* No low_set_pc is needed. */
- bool low_breakpoint_at (CORE_ADDR pc) override;
- };
- /* The singleton target ops object. */
- static sparc_target the_sparc_target;
- bool
- sparc_target::low_supports_breakpoints ()
- {
- return true;
- }
- CORE_ADDR
- sparc_target::low_get_pc (regcache *regcache)
- {
- return linux_get_pc_64bit (regcache);
- }
- /* Each offset is multiplied by 8, because of the register size.
- These offsets apply to the buffer sent/filled by ptrace.
- Additionally, the array elements order corresponds to the .dat file, and the
- gdb's registers enumeration order. */
- static int sparc_regmap[] = {
- /* These offsets correspond to GET/SETREGSET. */
- -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */
- 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */
- /* Floating point registers offsets correspond to GET/SETFPREGSET. */
- 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */
- 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */
- 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */
- 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */
- /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */
- 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */
- 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */
- 17 *8, /* pc */
- 18 *8, /* npc */
- 16 *8, /* state */
- /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
- next to f62. */
- 32 *8, /* fsr */
- -1, /* fprs */
- /* Y register is 32-bits length, but gdb takes care of that. */
- 19 *8, /* y */
- };
- struct regs_range_t
- {
- int regno_start;
- int regno_end;
- };
- static const struct regs_range_t gregs_ranges[] = {
- { 0, 31 }, /* g0 .. i7 */
- { 80, 82 }, /* pc .. state */
- { 84, 85 } /* fprs .. y */
- };
- #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
- static const struct regs_range_t fpregs_ranges[] = {
- { 32, 79 }, /* f0 .. f62 */
- { 83, 83 } /* fsr */
- };
- #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
- /* Defined in auto-generated file reg-sparc64.c. */
- void init_registers_sparc64 (void);
- extern const struct target_desc *tdesc_sparc64;
- bool
- sparc_target::low_cannot_store_register (int regno)
- {
- return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
- }
- bool
- sparc_target::low_cannot_fetch_register (int regno)
- {
- return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
- }
- static void
- sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf)
- {
- int i;
- CORE_ADDR addr = 0;
- unsigned char tmp_reg_buf[8];
- const int l0_regno = find_regno (regcache->tdesc, "l0");
- const int i7_regno = l0_regno + 15;
- /* These registers have to be stored in the stack. */
- memcpy (&addr,
- ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
- sizeof (addr));
- addr += BIAS;
- for (i = l0_regno; i <= i7_regno; i++)
- {
- collect_register (regcache, i, tmp_reg_buf);
- the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
- addr += sizeof (tmp_reg_buf);
- }
- }
- static void
- sparc_fill_gregset (struct regcache *regcache, void *buf)
- {
- int i;
- int range;
- for (range = 0; range < N_GREGS_RANGES; range++)
- for (i = gregs_ranges[range].regno_start;
- i <= gregs_ranges[range].regno_end; i++)
- if (sparc_regmap[i] != -1)
- collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
- sparc_fill_gregset_to_stack (regcache, buf);
- }
- static void
- sparc_fill_fpregset (struct regcache *regcache, void *buf)
- {
- int i;
- int range;
- for (range = 0; range < N_FPREGS_RANGES; range++)
- for (i = fpregs_ranges[range].regno_start;
- i <= fpregs_ranges[range].regno_end; i++)
- collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
- }
- static void
- sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)
- {
- int i;
- CORE_ADDR addr = 0;
- unsigned char tmp_reg_buf[8];
- const int l0_regno = find_regno (regcache->tdesc, "l0");
- const int i7_regno = l0_regno + 15;
- /* These registers have to be obtained from the stack. */
- memcpy (&addr,
- ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
- sizeof (addr));
- addr += BIAS;
- for (i = l0_regno; i <= i7_regno; i++)
- {
- the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
- supply_register (regcache, i, tmp_reg_buf);
- addr += sizeof (tmp_reg_buf);
- }
- }
- static void
- sparc_store_gregset (struct regcache *regcache, const void *buf)
- {
- int i;
- char zerobuf[8];
- int range;
- memset (zerobuf, 0, sizeof (zerobuf));
- for (range = 0; range < N_GREGS_RANGES; range++)
- for (i = gregs_ranges[range].regno_start;
- i <= gregs_ranges[range].regno_end; i++)
- if (sparc_regmap[i] != -1)
- supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
- else
- supply_register (regcache, i, zerobuf);
- sparc_store_gregset_from_stack (regcache, buf);
- }
- static void
- sparc_store_fpregset (struct regcache *regcache, const void *buf)
- {
- int i;
- int range;
- for (range = 0; range < N_FPREGS_RANGES; range++)
- for (i = fpregs_ranges[range].regno_start;
- i <= fpregs_ranges[range].regno_end;
- i++)
- supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
- }
- static const gdb_byte sparc_breakpoint[INSN_SIZE] = {
- 0x91, 0xd0, 0x20, 0x01
- };
- #define sparc_breakpoint_len INSN_SIZE
- /* Implementation of target ops method "sw_breakpoint_from_kind". */
- const gdb_byte *
- sparc_target::sw_breakpoint_from_kind (int kind, int *size)
- {
- *size = sparc_breakpoint_len;
- return sparc_breakpoint;
- }
- bool
- sparc_target::low_breakpoint_at (CORE_ADDR where)
- {
- unsigned char insn[INSN_SIZE];
- read_memory (where, (unsigned char *) insn, sizeof (insn));
- if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)
- return true;
- /* If necessary, recognize more trap instructions here. GDB only
- uses TRAP Always. */
- return false;
- }
- void
- sparc_target::low_arch_setup ()
- {
- current_process ()->tdesc = tdesc_sparc64;
- }
- static struct regset_info sparc_regsets[] = {
- { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
- GENERAL_REGS,
- sparc_fill_gregset, sparc_store_gregset },
- { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
- FP_REGS,
- sparc_fill_fpregset, sparc_store_fpregset },
- NULL_REGSET
- };
- static struct regsets_info sparc_regsets_info =
- {
- sparc_regsets, /* regsets */
- 0, /* num_regsets */
- NULL, /* disabled_regsets */
- };
- static struct usrregs_info sparc_usrregs_info =
- {
- sparc_num_regs,
- /* No regmap needs to be provided since this impl. doesn't use
- USRREGS. */
- NULL
- };
- static struct regs_info myregs_info =
- {
- NULL, /* regset_bitmap */
- &sparc_usrregs_info,
- &sparc_regsets_info
- };
- const regs_info *
- sparc_target::get_regs_info ()
- {
- return &myregs_info;
- }
- /* The linux target ops object. */
- linux_process_target *the_linux_target = &the_sparc_target;
- void
- initialize_low_arch (void)
- {
- /* Initialize the Linux target descriptions. */
- init_registers_sparc64 ();
- initialize_regsets_info (&sparc_regsets_info);
- }
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