[PATCH 2/3] Record right reg num of thumb special data instructions

Yao Qi
2016-02-22T16:53:45Z

When GDB decodes these thumb special data instructions, such as 'mov sp, r7'
the Rd is got incorrectly. According to the arch reference manual, the Rd
is DN:Rdn, in which DN is bit 7 and Rdn is bits 0 to 2. This patch fixes it.

gdb:

2016-02-22 Yao Qi <yao.qi@linaro.org>

* arm-tdep.c (thumb_record_ld_st_reg_offset): Fix the register
number of Rd.
---
gdb/arm-tdep.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 1a3a209..0c0e1a5 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -11512,10 +11512,10 @@ thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r)
}
else
{
- /* Format 8; special data processing insns. */
- reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
- record_buf[0] = ARM_PS_REGNUM;
- record_buf[1] = reg_src1;
+ /* Format 8; special data processing insns. */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = (bit (thumb_insn_r->arm_insn, 7) << 3
+ | bits (thumb_insn_r->arm_insn, 0, 2));
thumb_insn_r->reg_rec_count = 2;
}
}
--
1.9.1