diff options
Diffstat (limited to 'gdbserver/linux-sparc-low.c')
| -rw-r--r-- | gdbserver/linux-sparc-low.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/gdbserver/linux-sparc-low.c b/gdbserver/linux-sparc-low.c new file mode 100644 index 0000000..cfa76c0 --- /dev/null +++ b/gdbserver/linux-sparc-low.c @@ -0,0 +1,326 @@ +/* Low level interface to ptrace, for the remote server for GDB. + Copyright (C) 1995-2020 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) + +/* 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; + +static int +sparc_cannot_store_register (int regno) +{ + return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); +} + +static int +sparc_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 linux_target_ops method "sw_breakpoint_from_kind". */ + +static const unsigned char * +sparc_sw_breakpoint_from_kind (int kind, int *size) +{ + *size = sparc_breakpoint_len; + return sparc_breakpoint; +} + +static int +sparc_breakpoint_at (CORE_ADDR where) +{ + unsigned char insn[INSN_SIZE]; + + (*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn)); + + if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) + return 1; + + /* If necessary, recognize more trap instructions here. GDB only + uses TRAP Always. */ + + return 0; +} + +static void +sparc_arch_setup (void) +{ + 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 regs_info = + { + NULL, /* regset_bitmap */ + &sparc_usrregs_info, + &sparc_regsets_info + }; + +static const struct regs_info * +sparc_regs_info (void) +{ + return ®s_info; +} + +struct linux_target_ops the_low_target = { + sparc_arch_setup, + sparc_regs_info, + sparc_cannot_fetch_register, + sparc_cannot_store_register, + NULL, /* fetch_register */ + linux_get_pc_64bit, + /* No sparc_set_pc is needed. */ + NULL, + NULL, /* breakpoint_kind_from_pc */ + sparc_sw_breakpoint_from_kind, + NULL, /* get_next_pcs */ + 0, + sparc_breakpoint_at, + NULL, /* supports_z_point_type */ + NULL, NULL, NULL, NULL, + NULL, NULL +}; + +void +initialize_low_arch (void) +{ + /* Initialize the Linux target descriptions. */ + init_registers_sparc64 (); + + initialize_regsets_info (&sparc_regsets_info); +} |