diff options
Diffstat (limited to 'gdb/mips-tdep.c')
| -rw-r--r-- | gdb/mips-tdep.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c index 19f0e0dfa82..8b3ddb8870a 100644 --- a/gdb/mips-tdep.c +++ b/gdb/mips-tdep.c @@ -55,6 +55,8 @@ #include "trad-frame.h" #include "infcall.h" #include "floatformat.h" +#include "remote.h" +#include "target-descriptions.h" static const struct objfile_data *mips_pdr_data; @@ -119,6 +121,11 @@ static enum mips_fpu_type mips_fpu_type = MIPS_DEFAULT_FPU_TYPE; static int mips_debug = 0; +/* Properties (for struct target_desc) describing the g/G packet + layout. */ +#define PROPERTY_GP32 "internal: transfers-32bit-registers" +#define PROPERTY_GP64 "internal: transfers-64bit-registers" + /* MIPS specific per-architecture information */ struct gdbarch_tdep { @@ -141,6 +148,13 @@ struct gdbarch_tdep const struct mips_regnum *regnum; /* Register names table for the current register set. */ const char **mips_processor_reg_names; + + /* The size of register data available from the target, if known. + This doesn't quite obsolete the manual + mips64_transfers_32bit_regs_p, since that is documented to force + left alignment even for big endian (very strange). */ + int register_size_valid_p; + int register_size; }; static int @@ -245,6 +259,13 @@ mips_abi (struct gdbarch *gdbarch) int mips_isa_regsize (struct gdbarch *gdbarch) { + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* If we know how big the registers are, use that size. */ + if (tdep->register_size_valid_p) + return tdep->register_size; + + /* Fall back to the previous behavior. */ return (gdbarch_bfd_arch_info (gdbarch)->bits_per_word / gdbarch_bfd_arch_info (gdbarch)->bits_per_byte); } @@ -4711,6 +4732,37 @@ global_mips_abi (void) internal_error (__FILE__, __LINE__, _("unknown ABI string")); } +static void +mips_register_g_packet_guesses (struct gdbarch *gdbarch) +{ + static struct target_desc *tdesc_gp32, *tdesc_gp64; + + if (tdesc_gp32 == NULL) + { + /* Create feature sets with the appropriate properties. The values + are not important. */ + + tdesc_gp32 = allocate_target_description (); + set_tdesc_property (tdesc_gp32, PROPERTY_GP32, ""); + + tdesc_gp64 = allocate_target_description (); + set_tdesc_property (tdesc_gp64, PROPERTY_GP64, ""); + } + + /* If the size matches the set of 32-bit or 64-bit integer registers, + assume that's what we've got. */ + register_remote_g_packet_guess (gdbarch, 38 * 4, tdesc_gp32); + register_remote_g_packet_guess (gdbarch, 38 * 8, tdesc_gp64); + + /* If the size matches the full set of registers GDB traditionally + knows about, including floating point, for either 32-bit or + 64-bit, assume that's what we've got. */ + register_remote_g_packet_guess (gdbarch, 90 * 4, tdesc_gp32); + register_remote_g_packet_guess (gdbarch, 90 * 8, tdesc_gp64); + + /* Otherwise we don't have a useful guess. */ +} + static struct gdbarch * mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) { @@ -4855,6 +4907,16 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: fpu_type = %d\n", fpu_type); + /* Check for blatant incompatibilities. */ + + /* If we have only 32-bit registers, then we can't debug a 64-bit + ABI. */ + if (info.target_desc + && tdesc_property (info.target_desc, PROPERTY_GP32) != NULL + && mips_abi != MIPS_ABI_EABI32 + && mips_abi != MIPS_ABI_O32) + return NULL; + /* try to find a pre-existing architecture */ for (arches = gdbarch_list_lookup_by_info (arches, &info); arches != NULL; @@ -4885,6 +4947,23 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) tdep->found_abi = found_abi; tdep->mips_abi = mips_abi; tdep->mips_fpu_type = fpu_type; + tdep->register_size_valid_p = 0; + tdep->register_size = 0; + + if (info.target_desc) + { + /* Some useful properties can be inferred from the target. */ + if (tdesc_property (info.target_desc, PROPERTY_GP32) != NULL) + { + tdep->register_size_valid_p = 1; + tdep->register_size = 4; + } + else if (tdesc_property (info.target_desc, PROPERTY_GP64) != NULL) + { + tdep->register_size_valid_p = 1; + tdep->register_size = 8; + } + } /* Initially set everything according to the default ABI/ISA. */ set_gdbarch_short_bit (gdbarch, 16); @@ -5152,6 +5231,8 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_single_step_through_delay (gdbarch, mips_single_step_through_delay); + mips_register_g_packet_guesses (gdbarch); + /* Hook in OS ABI-specific overrides, if they have been registered. */ gdbarch_init_osabi (info, gdbarch); |