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[Qemu-devel] MIPS 'move' insn emulation
From: |
Sergey Smolov |
Subject: |
[Qemu-devel] MIPS 'move' insn emulation |
Date: |
Tue, 12 Sep 2017 17:14:29 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120713 Thunderbird/14.0 |
Hello, List!
I run MIPS assembler program on QEMU. The program is just a sample, here
is the code:
.text
addiu $8, $zero, 0x7
move $9, $8
sll $8, $8, 3
add $8, $8, $9
The program finishes on QEMU with the following values for registers,
and it's ok:
$8 - 0x3f
$9 - 0x7
Now I want to implement some logging features for MIPS assembler
programs. For example, I want to write a record to log every time the
'move' instruction writes some value to GPR register.
I've the code I probably need to modify in target/mips/translate.c:
[code]
static void gen_logic(DisasContext *ctx, uint32_t opc,
int rd, int rs, int rt)
{
...
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
}
[/code]
I suppose that for my assembler program cpu_gpr[rs] here should contain
0x7 value at runtime. Is it possible to extract this value somehow? I've
tried the following constructions:
GET_TCG_I32(cpu_gpr[rs])
((CPUMIPSState *)tcg_ctx.cpu)->active_tc.gpr[rs]
but they do not provide me the correct value. Could you help me in
solving this problem?
Thanks in advance,
Sergey Smolov
- [Qemu-devel] MIPS 'move' insn emulation,
Sergey Smolov <=
- Re: [Qemu-devel] MIPS 'move' insn emulation, Peter Maydell, 2017/09/12
- Re: [Qemu-devel] MIPS 'move' insn emulation, Sergey Smolov, 2017/09/12
- Re: [Qemu-devel] MIPS 'move' insn emulation, Peter Maydell, 2017/09/12
- Re: [Qemu-devel] MIPS 'move' insn emulation, Sergey Smolov, 2017/09/13
- Re: [Qemu-devel] MIPS 'move' insn emulation, Peter Maydell, 2017/09/13
- Re: [Qemu-devel] MIPS 'move' insn emulation, Yongbok Kim, 2017/09/13
- Re: [Qemu-devel] MIPS 'move' insn emulation, Sergey Smolov, 2017/09/14
- Re: [Qemu-devel] MIPS 'move' insn emulation, Peter Maydell, 2017/09/14
- Re: [Qemu-devel] MIPS 'move' insn emulation, Sergey Smolov, 2017/09/14
- Re: [Qemu-devel] MIPS 'move' insn emulation, Yongbok Kim, 2017/09/14