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Re: [Qemu-devel] another SPARC issue
From: |
Laurent Desnogues |
Subject: |
Re: [Qemu-devel] another SPARC issue |
Date: |
Tue, 5 Aug 2008 22:36:43 +0200 |
On Tue, Aug 5, 2008 at 10:20 PM, Vince Weaver <address@hidden> wrote:
>
> The instruction is
> ldda [ %o1 + 0x40 ] %asi, %f16
>
> but under Qemu for some reason 0x80 is added to %o1 (instead of 0x40).
>
> Indeed if you look at the generated TCG (see below), the 0x40 is being added
> in twice. I was digging around in translate.c but can't seem to see why
> this is happning.
>
> Any help would be appreciated...
Since I am not afraid to be ridiculous again, here is my take:
- in disas_sparc_insn, line 4199:
} else if (IS_IMM) { /* immediate */
rs2 = GET_FIELDs(insn, 19, 31);
tcg_gen_addi_tl(cpu_addr, cpu_src1, (int)rs2);
- line 4307:
case 0x13: /* load double word alternate */
save_state(dc, cpu_cond);
gen_ldda_asi(cpu_val, cpu_addr, insn, rd);
static inline void gen_ldda_asi(TCGv hi, TCGv addr, int insn, int rd)
{
TCGv r_asi, r_rd;
r_asi = gen_get_asi(insn, addr);
r_rd = tcg_const_i32(rd);
tcg_gen_helper_0_3(helper_ldda_asi, addr, r_asi, r_rd);
tcg_temp_free(r_rd);
tcg_temp_free(r_asi);
}
static inline TCGv gen_get_asi(int insn, TCGv r_addr)
{
int asi, offset;
TCGv r_asi;
if (IS_IMM) {
r_asi = tcg_temp_new(TCG_TYPE_I32);
offset = GET_FIELD(insn, 25, 31);
tcg_gen_addi_tl(r_addr, r_addr, offset);
tcg_gen_ld_i32(r_asi, cpu_env, offsetof(CPUSPARCState, asi));
} else {
asi = GET_FIELD(insn, 19, 26);
r_asi = tcg_const_i32(asi);
}
return r_asi;
}
I am not sure I followed the right path, but it seems that indeed
for asi ld/st the constant gets added twice: once in the disas
function and once in gen_get_asi.
Laurent
- [Qemu-devel] another SPARC issue, Vince Weaver, 2008/08/05
- Re: [Qemu-devel] another SPARC issue,
Laurent Desnogues <=
- Re: [Qemu-devel] another SPARC issue, Vince Weaver, 2008/08/05
- Re: [Qemu-devel] another SPARC issue, Laurent Desnogues, 2008/08/06
- Re: [Qemu-devel] another SPARC issue, Blue Swirl, 2008/08/06
- [Qemu-devel] one more SPARC issue, Vince Weaver, 2008/08/06
- Re: [Qemu-devel] one more SPARC issue, Julian Seward, 2008/08/06
- Re: [Qemu-devel] one more SPARC issue, Blue Swirl, 2008/08/06