| /* Low level interface to ptrace, for the remote server for GDB. |
| Copyright (C) 1995-2021 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); |
| } |