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target-sparc: fix udiv(cc) and sdiv(cc)

Browse Source 
Since commit 5a4bb580cd, Xorg crashes on
a Debian Etch image. The commit itself is fine, but it triggers a bug
due to wrong computation of flags for udiv(cc) and sdiv(cc).

This patch only compute cc_src2 for the cc version of udiv/sdiv. It
also moves the update of cc_dst and cc_op to the helper, as it is
faster doing it here when there is already an helper.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Aurelien Jarno 2010-12-25 23:25:47 +01:00 committed by Blue Swirl
parent 818c2e1b97
commit 0fcec41eec
3 changed files with 50 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
target-sparc/helper.h
View File

@ -37,7 +37,9 @@ DEF_HELPER_0(save, void)
DEF_HELPER_0(restore, void)
DEF_HELPER_1(flush, void, tl)
DEF_HELPER_2(udiv, tl, tl, tl)
DEF_HELPER_2(udiv_cc, tl, tl, tl)
DEF_HELPER_2(sdiv, tl, tl, tl)
DEF_HELPER_2(sdiv_cc, tl, tl, tl)
DEF_HELPER_2(stdf, void, tl, int)
DEF_HELPER_2(lddf, void, tl, int)
DEF_HELPER_2(ldqf, void, tl, int)

54
target-sparc/op_helper.c
View File

@ -3300,8 +3300,9 @@ void helper_rett(void)
}
#endif
target_ulong helper_udiv(target_ulong a, target_ulong b)
static target_ulong helper_udiv_common(target_ulong a, target_ulong b, int cc)
{
int overflow = 0;
uint64_t x0;
uint32_t x1;
@ -3314,16 +3315,31 @@ target_ulong helper_udiv(target_ulong a, target_ulong b)
x0 = x0 / x1;
if (x0 > 0xffffffff) {
env->cc_src2 = 1;
return 0xffffffff;
} else {
env->cc_src2 = 0;
return x0;
x0 = 0xffffffff;
overflow = 1;
}
if (cc) {
env->cc_dst = x0;
env->cc_src2 = overflow;
env->cc_op = CC_OP_DIV;
}
return x0;
}
target_ulong helper_sdiv(target_ulong a, target_ulong b)
target_ulong helper_udiv(target_ulong a, target_ulong b)
{
return helper_udiv_common(a, b, 0);
}
target_ulong helper_udiv_cc(target_ulong a, target_ulong b)
{
return helper_udiv_common(a, b, 1);
}
static target_ulong helper_sdiv_common(target_ulong a, target_ulong b, int cc)
{
int overflow = 0;
int64_t x0;
int32_t x1;
@ -3336,12 +3352,26 @@ target_ulong helper_sdiv(target_ulong a, target_ulong b)
x0 = x0 / x1;
if ((int32_t) x0 != x0) {
env->cc_src2 = 1;
return x0 < 0? 0x80000000: 0x7fffffff;
} else {
env->cc_src2 = 0;
return x0;
x0 = x0 < 0 ? 0x80000000: 0x7fffffff;
overflow = 1;
}
if (cc) {
env->cc_dst = x0;
env->cc_src2 = overflow;
env->cc_op = CC_OP_DIV;
}
return x0;
}
target_ulong helper_sdiv(target_ulong a, target_ulong b)
{
return helper_sdiv_common(a, b, 0);
}
target_ulong helper_sdiv_cc(target_ulong a, target_ulong b)
{
return helper_sdiv_common(a, b, 1);
}
void helper_stdf(target_ulong addr, int mem_idx)

12
target-sparc/translate.c
View File

@ -3162,20 +3162,20 @@ static void disas_sparc_insn(DisasContext * dc)
#endif
case 0xe: /* udiv */
CHECK_IU_FEATURE(dc, DIV);
gen_helper_udiv(cpu_dst, cpu_src1, cpu_src2);
if (xop & 0x10) {
tcg_gen_mov_tl(cpu_cc_dst, cpu_dst);
tcg_gen_movi_i32(cpu_cc_op, CC_OP_DIV);
gen_helper_udiv_cc(cpu_dst, cpu_src1, cpu_src2);
dc->cc_op = CC_OP_DIV;
} else {
gen_helper_udiv(cpu_dst, cpu_src1, cpu_src2);
}
break;
case 0xf: /* sdiv */
CHECK_IU_FEATURE(dc, DIV);
gen_helper_sdiv(cpu_dst, cpu_src1, cpu_src2);
if (xop & 0x10) {
tcg_gen_mov_tl(cpu_cc_dst, cpu_dst);
tcg_gen_movi_i32(cpu_cc_op, CC_OP_DIV);
gen_helper_sdiv_cc(cpu_dst, cpu_src1, cpu_src2);
dc->cc_op = CC_OP_DIV;
} else {
gen_helper_sdiv(cpu_dst, cpu_src1, cpu_src2);
}
break;
default: