aboutsummaryrefslogtreecommitdiff
path: root/gdb/mips-linux-tdep.c
diff options
context:
space:
mode:
Diffstat (limited to 'gdb/mips-linux-tdep.c')
-rw-r--r--gdb/mips-linux-tdep.c100
1 files changed, 81 insertions, 19 deletions
diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c
index 8b851f3..b16fc53 100644
--- a/gdb/mips-linux-tdep.c
+++ b/gdb/mips-linux-tdep.c
@@ -37,6 +37,7 @@
#include "solib-svr4.h"
#include "solist.h"
#include "symtab.h"
+#include "target-descriptions.h"
#include "mips-linux-tdep.h"
static struct target_so_ops mips_svr4_so_ops;
@@ -96,9 +97,12 @@ mips_supply_gregset (struct regcache *regcache,
memset (zerobuf, 0, MAX_REGISTER_SIZE);
- for (regi = EF_REG0; regi <= EF_REG31; regi++)
+ for (regi = EF_REG0 + 1; regi <= EF_REG31; regi++)
supply_32bit_reg (regcache, regi - EF_REG0, regp + regi);
+ if (mips_linux_restart_reg_p (current_gdbarch))
+ supply_32bit_reg (regcache, MIPS_RESTART_REGNUM, regp + EF_REG0);
+
supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->lo,
regp + EF_LO);
supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->hi,
@@ -113,9 +117,10 @@ mips_supply_gregset (struct regcache *regcache,
regp + EF_CP0_CAUSE);
/* Fill inaccessible registers with zero. */
+ regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf);
regcache_raw_supply (regcache, MIPS_UNUSED_REGNUM, zerobuf);
for (regi = MIPS_FIRST_EMBED_REGNUM;
- regi < MIPS_LAST_EMBED_REGNUM;
+ regi <= MIPS_LAST_EMBED_REGNUM;
regi++)
regcache_raw_supply (regcache, regi, zerobuf);
}
@@ -133,7 +138,7 @@ mips_fill_gregset (const struct regcache *regcache,
if (regno == -1)
{
memset (regp, 0, sizeof (mips_elf_gregset_t));
- for (regi = 0; regi < 32; regi++)
+ for (regi = 1; regi < 32; regi++)
mips_fill_gregset (regcache, gregsetp, regi);
mips_fill_gregset (regcache, gregsetp,
mips_regnum (current_gdbarch)->lo);
@@ -146,10 +151,11 @@ mips_fill_gregset (const struct regcache *regcache,
mips_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);
mips_fill_gregset (regcache, gregsetp,
mips_regnum (current_gdbarch)->cause);
+ mips_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM);
return;
}
- if (regno < 32)
+ if (regno > 0 && regno < 32)
{
dst = regp + regno + EF_REG0;
regcache_raw_collect (regcache, regno, dst);
@@ -168,6 +174,9 @@ mips_fill_gregset (const struct regcache *regcache,
regaddr = EF_CP0_STATUS;
else if (regno == mips_regnum (current_gdbarch)->cause)
regaddr = EF_CP0_CAUSE;
+ else if (mips_linux_restart_reg_p (current_gdbarch)
+ && regno == MIPS_RESTART_REGNUM)
+ regaddr = EF_REG0;
else
regaddr = -1;
@@ -294,10 +303,14 @@ mips64_supply_gregset (struct regcache *regcache,
memset (zerobuf, 0, MAX_REGISTER_SIZE);
- for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++)
+ for (regi = MIPS64_EF_REG0 + 1; regi <= MIPS64_EF_REG31; regi++)
supply_64bit_reg (regcache, regi - MIPS64_EF_REG0,
(const gdb_byte *)(regp + regi));
+ if (mips_linux_restart_reg_p (current_gdbarch))
+ supply_64bit_reg (regcache, MIPS_RESTART_REGNUM,
+ (const gdb_byte *)(regp + MIPS64_EF_REG0));
+
supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->lo,
(const gdb_byte *) (regp + MIPS64_EF_LO));
supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->hi,
@@ -313,9 +326,10 @@ mips64_supply_gregset (struct regcache *regcache,
(const gdb_byte *) (regp + MIPS64_EF_CP0_CAUSE));
/* Fill inaccessible registers with zero. */
+ regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf);
regcache_raw_supply (regcache, MIPS_UNUSED_REGNUM, zerobuf);
for (regi = MIPS_FIRST_EMBED_REGNUM;
- regi < MIPS_LAST_EMBED_REGNUM;
+ regi <= MIPS_LAST_EMBED_REGNUM;
regi++)
regcache_raw_supply (regcache, regi, zerobuf);
}
@@ -333,7 +347,7 @@ mips64_fill_gregset (const struct regcache *regcache,
if (regno == -1)
{
memset (regp, 0, sizeof (mips64_elf_gregset_t));
- for (regi = 0; regi < 32; regi++)
+ for (regi = 1; regi < 32; regi++)
mips64_fill_gregset (regcache, gregsetp, regi);
mips64_fill_gregset (regcache, gregsetp,
mips_regnum (current_gdbarch)->lo);
@@ -346,10 +360,11 @@ mips64_fill_gregset (const struct regcache *regcache,
mips64_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);
mips64_fill_gregset (regcache, gregsetp,
mips_regnum (current_gdbarch)->cause);
+ mips64_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM);
return;
}
- if (regno < 32)
+ if (regno > 0 && regno < 32)
regaddr = regno + MIPS64_EF_REG0;
else if (regno == mips_regnum (current_gdbarch)->lo)
regaddr = MIPS64_EF_LO;
@@ -363,6 +378,9 @@ mips64_fill_gregset (const struct regcache *regcache,
regaddr = MIPS64_EF_CP0_STATUS;
else if (regno == mips_regnum (current_gdbarch)->cause)
regaddr = MIPS64_EF_CP0_CAUSE;
+ else if (mips_linux_restart_reg_p (current_gdbarch)
+ && regno == MIPS_RESTART_REGNUM)
+ regaddr = MIPS64_EF_REG0;
else
regaddr = -1;
@@ -838,11 +856,11 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
else
regs_base = sigcontext_base;
-#if 0
- trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM
- + gdbarch_num_regs (current_gdbarch),
- regs_base + SIGCONTEXT_REGS);
-#endif
+ if (mips_linux_restart_reg_p (current_gdbarch))
+ trad_frame_set_reg_addr (this_cache,
+ (MIPS_RESTART_REGNUM
+ + gdbarch_num_regs (current_gdbarch)),
+ regs_base + SIGCONTEXT_REGS);
for (ireg = 1; ireg < 32; ireg++)
trad_frame_set_reg_addr (this_cache,
@@ -988,12 +1006,11 @@ mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
else
sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET;
-#if 0
- trad_frame_set_reg_addr (this_cache,
- ORIG_ZERO_REGNUM
- + gdbarch_num_regs (current_gdbarch),
- sigcontext_base + N64_SIGCONTEXT_REGS);
-#endif
+ if (mips_linux_restart_reg_p (current_gdbarch))
+ trad_frame_set_reg_addr (this_cache,
+ (MIPS_RESTART_REGNUM
+ + gdbarch_num_regs (current_gdbarch)),
+ sigcontext_base + N64_SIGCONTEXT_REGS);
for (ireg = 1; ireg < 32; ireg++)
trad_frame_set_reg_addr (this_cache,
@@ -1036,6 +1053,30 @@ mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
func));
}
+static void
+mips_linux_write_pc (CORE_ADDR pc, ptid_t ptid)
+{
+ write_register_pid (PC_REGNUM, pc, ptid);
+
+ /* Clear the syscall restart flag. */
+ if (mips_linux_restart_reg_p (current_gdbarch))
+ write_register_pid (MIPS_RESTART_REGNUM, 0, ptid);
+}
+
+/* Return 1 if MIPS_RESTART_REGNUM is usable. */
+
+int
+mips_linux_restart_reg_p (struct gdbarch *gdbarch)
+{
+ /* If we do not have a target description with registers, then
+ MIPS_RESTART_REGNUM will not be included in the register set. */
+ if (!tdesc_has_registers (gdbarch_target_desc (gdbarch)))
+ return 0;
+
+ /* If we do, then MIPS_RESTART_REGNUM is safe to check; it will
+ either be GPR-sized or missing. */
+ return register_size (gdbarch, MIPS_RESTART_REGNUM) > 0;
+}
/* Initialize one of the GNU/Linux OS ABIs. */
@@ -1045,6 +1086,7 @@ mips_linux_init_abi (struct gdbarch_info info,
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum mips_abi abi = mips_abi (gdbarch);
+ struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info;
switch (abi)
{
@@ -1105,6 +1147,26 @@ mips_linux_init_abi (struct gdbarch_info info,
= mips_linux_in_dynsym_resolve_code;
}
set_solib_ops (gdbarch, &mips_svr4_so_ops);
+
+ set_gdbarch_write_pc (gdbarch, mips_linux_write_pc);
+
+ if (tdesc_data)
+ {
+ const struct tdesc_feature *feature;
+
+ /* If we have target-described registers, then we can safely
+ reserve a number for MIPS_RESTART_REGNUM (whether it is
+ described or not). */
+ gdb_assert (gdbarch_num_regs (gdbarch) <= MIPS_RESTART_REGNUM);
+ set_gdbarch_num_regs (gdbarch, MIPS_RESTART_REGNUM + 1);
+
+ /* If it's present, then assign it to the reserved number. */
+ feature = tdesc_find_feature (info.target_desc,
+ "org.gnu.gdb.mips.linux");
+ if (feature != NULL)
+ tdesc_numbered_register (feature, tdesc_data, MIPS_RESTART_REGNUM,
+ "restart");
+ }
}
void
generated by cgit v1.1 at 2024-11-24 06:08:16 +0000