diff options
Diffstat (limited to 'gdb/gdbserver/linux-mips-low.c')
| -rw-r--r-- | gdb/gdbserver/linux-mips-low.c | 184 |
1 files changed, 174 insertions, 10 deletions
diff --git a/gdb/gdbserver/linux-mips-low.c b/gdb/gdbserver/linux-mips-low.c index 7829550..797d046 100644 --- a/gdb/gdbserver/linux-mips-low.c +++ b/gdb/gdbserver/linux-mips-low.c @@ -23,6 +23,7 @@ #include "linux-low.h" #include <sys/ptrace.h> +#include <endian.h> #include "gdb_proc_service.h" @@ -38,6 +39,15 @@ #include <asm/ptrace.h> +union mips_register +{ + unsigned char buf[8]; + + /* Deliberately signed, for proper sign extension. */ + int reg32; + long long reg64; +}; + /* Return the ptrace ``address'' of register REGNO. */ /* Matches mips_generic32_regs */ @@ -107,20 +117,25 @@ mips_cannot_store_register (int regno) static CORE_ADDR mips_get_pc () { - unsigned long pc; - collect_register_by_name ("pc", &pc); - return pc; + union mips_register pc; + collect_register_by_name ("pc", pc.buf); + return register_size (0) == 4 ? pc.reg32 : pc.reg64; } static void mips_set_pc (CORE_ADDR pc) { - unsigned long newpc = pc; - supply_register_by_name ("pc", &newpc); + union mips_register newpc; + if (register_size (0) == 4) + newpc.reg32 = pc; + else + newpc.reg64 = pc; + + supply_register_by_name ("pc", newpc.buf); } /* Correct in either endianness. */ -static const unsigned long mips_breakpoint = 0x0005000d; +static const unsigned int mips_breakpoint = 0x0005000d; #define mips_breakpoint_len 4 /* We only place breakpoints in empty marker functions, and thread locking @@ -129,15 +144,15 @@ static const unsigned long mips_breakpoint = 0x0005000d; static CORE_ADDR mips_reinsert_addr () { - unsigned long pc; - collect_register_by_name ("ra", &pc); - return pc; + union mips_register ra; + collect_register_by_name ("ra", ra.buf); + return register_size (0) == 4 ? ra.reg32 : ra.reg64; } static int mips_breakpoint_at (CORE_ADDR where) { - unsigned long insn; + unsigned int insn; (*the_target->read_memory) (where, (unsigned char *) &insn, 4); if (insn == mips_breakpoint) @@ -165,6 +180,155 @@ ps_get_thread_area (const struct ps_prochandle *ph, return PS_OK; } +#ifdef HAVE_PTRACE_GETREGS + +static void +mips_collect_register (int use_64bit, int regno, union mips_register *reg) +{ + union mips_register tmp_reg; + + if (use_64bit) + { + collect_register (regno, &tmp_reg.reg64); + *reg = tmp_reg; + } + else + { + collect_register (regno, &tmp_reg.reg32); + reg->reg64 = tmp_reg.reg32; + } +} + +static void +mips_supply_register (int use_64bit, int regno, const union mips_register *reg) +{ + int offset = 0; + + /* For big-endian 32-bit targets, ignore the high four bytes of each + eight-byte slot. */ + if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit) + offset = 4; + + supply_register (regno, reg->buf + offset); +} + +static void +mips_collect_register_32bit (int use_64bit, int regno, unsigned char *buf) +{ + union mips_register tmp_reg; + int reg32; + + mips_collect_register (use_64bit, regno, &tmp_reg); + reg32 = tmp_reg.reg64; + memcpy (buf, ®32, 4); +} + +static void +mips_supply_register_32bit (int use_64bit, int regno, const unsigned char *buf) +{ + union mips_register tmp_reg; + int reg32; + + memcpy (®32, buf, 4); + tmp_reg.reg64 = reg32; + mips_supply_register (use_64bit, regno, &tmp_reg); +} + +static void +mips_fill_gregset (void *buf) +{ + union mips_register *regset = buf; + int i, use_64bit; + + use_64bit = (register_size (0) == 8); + + for (i = 0; i < 32; i++) + mips_collect_register (use_64bit, i, regset + i); + + mips_collect_register (use_64bit, find_regno ("lo"), regset + 32); + mips_collect_register (use_64bit, find_regno ("hi"), regset + 33); + mips_collect_register (use_64bit, find_regno ("pc"), regset + 34); + mips_collect_register (use_64bit, find_regno ("bad"), regset + 35); + mips_collect_register (use_64bit, find_regno ("sr"), regset + 36); + mips_collect_register (use_64bit, find_regno ("cause"), regset + 37); +} + +static void +mips_store_gregset (const void *buf) +{ + const union mips_register *regset = buf; + int i, use_64bit; + + use_64bit = (register_size (0) == 8); + + for (i = 0; i < 32; i++) + mips_supply_register (use_64bit, i, regset + i); + + mips_supply_register (use_64bit, find_regno ("lo"), regset + 32); + mips_supply_register (use_64bit, find_regno ("hi"), regset + 33); + mips_supply_register (use_64bit, find_regno ("pc"), regset + 34); + mips_supply_register (use_64bit, find_regno ("bad"), regset + 35); + mips_supply_register (use_64bit, find_regno ("sr"), regset + 36); + mips_supply_register (use_64bit, find_regno ("cause"), regset + 37); +} + +static void +mips_fill_fpregset (void *buf) +{ + union mips_register *regset = buf; + int i, use_64bit, first_fp, big_endian; + + use_64bit = (register_size (0) == 8); + first_fp = find_regno ("f0"); + big_endian = (__BYTE_ORDER == __BIG_ENDIAN); + + /* See GDB for a discussion of this peculiar layout. */ + for (i = 0; i < 32; i++) + if (use_64bit) + collect_register (first_fp + i, regset[i].buf); + else + collect_register (first_fp + i, + regset[i & ~1].buf + 4 * (big_endian != (i & 1))); + + mips_collect_register_32bit (use_64bit, find_regno ("fsr"), regset[32].buf); + mips_collect_register_32bit (use_64bit, find_regno ("fir"), + regset[32].buf + 4); +} + +static void +mips_store_fpregset (const void *buf) +{ + const union mips_register *regset = buf; + int i, use_64bit, first_fp, big_endian; + + use_64bit = (register_size (0) == 8); + first_fp = find_regno ("f0"); + big_endian = (__BYTE_ORDER == __BIG_ENDIAN); + + /* See GDB for a discussion of this peculiar layout. */ + for (i = 0; i < 32; i++) + if (use_64bit) + supply_register (first_fp + i, regset[i].buf); + else + supply_register (first_fp + i, + regset[i & ~1].buf + 4 * (big_endian != (i & 1))); + + mips_supply_register_32bit (use_64bit, find_regno ("fsr"), regset[32].buf); + mips_supply_register_32bit (use_64bit, find_regno ("fir"), + regset[32].buf + 4); +} +#endif /* HAVE_PTRACE_GETREGS */ + +struct regset_info target_regsets[] = { +#ifdef HAVE_PTRACE_GETREGS + { PTRACE_GETREGS, PTRACE_SETREGS, 38 * 8, GENERAL_REGS, + mips_fill_gregset, mips_store_gregset }, + { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 33 * 8, FP_REGS, + mips_fill_fpregset, mips_store_fpregset }, +#endif /* HAVE_PTRACE_GETREGS */ + { 0, 0, -1, -1, NULL, NULL } +}; + struct linux_target_ops the_low_target = { mips_num_regs, mips_regmap, |