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gdb: LoongArch: Implement the return_value gdbarch method

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When execute the following command on LoongArch:

  make check-gdb TESTS="gdb.base/async.exp"

there exist the following failed testcases:

  FAIL: gdb.base/async.exp: finish& (timeout)
  FAIL: gdb.base/async.exp: jump& (timeout)
  FAIL: gdb.base/async.exp: until& (timeout)
  FAIL: gdb.base/async.exp: set exec-done-display off (GDB internal error)

we can see the following messages in gdb/testsuite/gdb.log:

  finish&
  Run till exit from #0  foo () at /home/loongson/gdb.git/gdb/testsuite/gdb.base/async.c:9
  (gdb) /home/loongson/gdb.git/gdb/gdbarch.c:2646: internal-error: gdbarch_return_value: Assertion `gdbarch->return_value != NULL' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.

In order to fix the above failed testcases, implement the return_value
gdbarch method on LoongArch.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
This commit is contained in:
Tiezhu Yang
2022-05-09 16:26:47 +08:00
parent 205d054282
commit 0b8c95579f
1 changed files with 33 additions and 0 deletions
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33
gdb/loongarch-tdep.c
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@ -247,6 +247,36 @@ static const struct frame_unwind loongarch_frame_unwind = {
/*.prev_arch =*/nullptr,
};
/* Implement the return_value gdbarch method for LoongArch. */
static enum return_value_convention
loongarch_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *type, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (gdbarch);
auto regs = tdep->regs;
int len = TYPE_LENGTH (type);
int regnum = -1;
/* See if our value is returned through a register. If it is, then
store the associated register number in REGNUM. */
switch (type->code ())
{
case TYPE_CODE_INT:
regnum = regs.r + 4;
break;
}
/* Extract the return value from the register where it was stored. */
if (readbuf)
regcache->raw_read_part (regnum, 0, len, readbuf);
if (writebuf)
regcache->raw_write_part (regnum, 0, len, writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
/* Implement the "dwarf2_reg_to_regnum" gdbarch method. */
static int
@ -418,6 +448,9 @@ loongarch_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* Finalise the target description registers. */
tdesc_use_registers (gdbarch, tdesc, std::move (tdesc_data));
/* Return value info */
set_gdbarch_return_value (gdbarch, loongarch_return_value);
/* Advance PC across function entry code. */
set_gdbarch_skip_prologue (gdbarch, loongarch_skip_prologue);