diff options
Diffstat (limited to 'gdb/i386-tdep.c')
| -rw-r--r-- | gdb/i386-tdep.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c index ad19691..7a8d2de 100644 --- a/gdb/i386-tdep.c +++ b/gdb/i386-tdep.c @@ -56,6 +56,23 @@ static char *i386_register_names[] = "mxcsr" }; +/* MMX registers. */ + +static char *i386_mmx_names[] = +{ + "mm0", "mm1", "mm2", "mm3", + "mm4", "mm5", "mm6", "mm7" +}; +static const int mmx_num_regs = (sizeof (i386_mmx_names) + / sizeof (i386_mmx_names[0])); +#define MM0_REGNUM (NUM_REGS) + +static int +mmx_regnum_p (int reg) +{ + return (reg >= MM0_REGNUM && reg < MM0_REGNUM + mmx_num_regs); +} + /* Return the name of register REG. */ const char * @@ -63,6 +80,8 @@ i386_register_name (int reg) { if (reg < 0) return NULL; + if (mmx_regnum_p (reg)) + return i386_mmx_names[reg - MM0_REGNUM]; if (reg >= sizeof (i386_register_names) / sizeof (*i386_register_names)) return NULL; @@ -1090,9 +1109,64 @@ i386_register_virtual_type (int regnum) if (IS_SSE_REGNUM (regnum)) return builtin_type_vec128i; + if (mmx_regnum_p (regnum)) + return builtin_type_vec64i; + return builtin_type_int; } +/* Map a cooked register onto a raw register or memory. For the i386, + the MMX registers need to be mapped onto floating point registers. */ + +static int +mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum) +{ + int mmxi; + ULONGEST fstat; + int tos; + int fpi; + mmxi = regnum - MM0_REGNUM; + regcache_raw_read_unsigned (regcache, FSTAT_REGNUM, &fstat); + tos = (fstat >> 11) & 0x7; + fpi = (mmxi + tos) % 8; + return (FP0_REGNUM + fpi); +} + +static void +i386_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, + int regnum, void *buf) +{ + if (mmx_regnum_p (regnum)) + { + char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE); + int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum); + regcache_raw_read (regcache, fpnum, mmx_buf); + /* Extract (always little endian). */ + memcpy (buf, mmx_buf, REGISTER_RAW_SIZE (regnum)); + } + else + regcache_raw_read (regcache, regnum, buf); +} + +static void +i386_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, + int regnum, const void *buf) +{ + if (mmx_regnum_p (regnum)) + { + char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE); + int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum); + /* Read ... */ + regcache_raw_read (regcache, fpnum, mmx_buf); + /* ... Modify ... (always little endian). */ + memcpy (mmx_buf, buf, REGISTER_RAW_SIZE (regnum)); + /* ... Write. */ + regcache_raw_write (regcache, fpnum, mmx_buf); + } + else + regcache_raw_write (regcache, regnum, buf); +} + /* Return true iff register REGNUM's virtual format is different from its raw format. Note that this definition assumes that the host supports IEEE 32-bit floats, since it doesn't say that SSE @@ -1486,6 +1560,11 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_frame_num_args (gdbarch, i386_frame_num_args); set_gdbarch_pc_in_sigtramp (gdbarch, i386_pc_in_sigtramp); + /* Wire in the MMX registers. */ + set_gdbarch_num_pseudo_regs (gdbarch, mmx_num_regs); + set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read); + set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write); + /* Hook in ABI-specific overrides, if they have been registered. */ gdbarch_init_osabi (info, gdbarch, osabi); |