[2/2] gdb: LoongArch: Support reg aliases in info reg command
Commit Message
According to LoongArch ELF ABI specification [1], support the register
aliases in "info register" command.
Without this patch:
```
(gdb) info reg a0
Invalid register `a0'
```
With this patch:
```
(gdb) info reg a0
a0 0x1 1
```
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_register_convention
Signed-off-by: Hui Li <lihui@loongson.cn>
---
gdb/loongarch-tdep.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
@@ -387,6 +387,14 @@ loongarch_software_single_step (struct regcache *regcache)
return {next_pc};
}
+/* Callback function for user_reg_add. */
+
+static struct value *
+value_of_loongarch_user_reg (frame_info_ptr frame, const void *baton)
+{
+ return value_of_register ((long long) baton, frame);
+}
+
/* Implement the frame_align gdbarch method. */
static CORE_ADDR
@@ -1589,6 +1597,19 @@ loongarch_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
info.target_desc = tdesc;
info.tdesc_data = tdesc_data.get ();
+ for (int i = 0; i < ARRAY_SIZE (loongarch_r_lp64_name); ++i)
+ if (loongarch_r_lp64_name[i][0] != '\0')
+ user_reg_add (gdbarch, loongarch_r_lp64_name[i] + 1,
+ value_of_loongarch_user_reg, (void *) (size_t) i);
+
+ for (int i = 0; i < ARRAY_SIZE (loongarch_f_lp64_name); ++i)
+ {
+ if (loongarch_f_lp64_name[i][0] != '\0')
+ user_reg_add (gdbarch, loongarch_f_lp64_name[i] + 1,
+ value_of_loongarch_user_reg,
+ (void *) (size_t) (LOONGARCH_FIRST_FP_REGNUM + i));
+ }
+
/* Information about registers. */
set_gdbarch_num_regs (gdbarch, regnum);
set_gdbarch_sp_regnum (gdbarch, LOONGARCH_SP_REGNUM);