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[Qemu-devel] PPC debugging broken
From: |
Blue Swirl |
Subject: |
[Qemu-devel] PPC debugging broken |
Date: |
Fri, 13 Feb 2009 22:30:27 +0200 |
It looks like debugging confuses PPC branch code generation.
For example, I'm doing single stepping from GDB:
IN: cmdline_prompt
0xfff158a0: b 0xfff15960
(Unconditional branch to 0xfff15960)
OP:
movi_i32 nip,$0xfff15960
(OK, branch)
movi_i32 nip,$0xfff158a4
(WTF?)
movi_i32 tmp0,$0x10002
movi_i64 tmp1,$raise_exception
call tmp1,$0x0,$0,tmp0
exit_tb $0x0
(Execution continues on $nip + 4 instead of branch target)
IN: cmdline_prompt
0xfff158a4: lis r9,-12
OP:
movi_i32 r9,$0xfff40000
movi_i32 nip,$0xfff158a8
movi_i32 nip,$0xfff158a8
movi_i32 tmp0,$0x10002
movi_i64 tmp1,$raise_exception
call tmp1,$0x0,$0,tmp0
exit_tb $0x0
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