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target/ppc: Set result to QNaN for DENBCD when VXCVI occurs 

According to the ISA, for instruction DENBCD:
"If an invalid BCD digit or sign code is detected in the source
operand, an invalid-operation exception (VXCVI) occurs."

In the Invalid Operation Exception section, there is the situation:
"When Invalid Operation Exception is disabled (VE=0) and Invalid
Operation occurs (...) If the operation is an (...) or format the
target FPR is set to a Quiet NaN". This was not being done in
QEMU.

This patch sets the result to QNaN when the instruction DENBCD causes
an Invalid Operation Exception.

Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220906125523.38765-5-victor.colombo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Víctor Colombo 2022-09-06 09:55:19 -03:00 committed by Daniel Henrique Barboza
parent 34f760bac2
commit 3ecec4c042
1 changed files with 24 additions and 2 deletions
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26
target/ppc/dfp_helper.c
View File

@ -1147,6 +1147,26 @@ static inline uint8_t dfp_get_bcd_digit_128(ppc_vsr_t *t, unsigned n)
return t->VsrD((n & 0x10) ? 0 : 1) >> ((n << 2) & 63) & 15;
}
static inline void dfp_invalid_op_vxcvi_64(struct PPC_DFP *dfp)
{
/* TODO: fpscr is incorrectly not being saved to env */
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FPSCR_VE);
if ((dfp->env->fpscr & FP_VE) == 0) {
dfp->vt.VsrD(1) = 0x7c00000000000000; /* QNaN */
}
}
static inline void dfp_invalid_op_vxcvi_128(struct PPC_DFP *dfp)
{
/* TODO: fpscr is incorrectly not being saved to env */
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FPSCR_VE);
if ((dfp->env->fpscr & FP_VE) == 0) {
dfp->vt.VsrD(0) = 0x7c00000000000000; /* QNaN */
dfp->vt.VsrD(1) = 0x0;
}
}
#define DFP_HELPER_ENBCD(op, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \
uint32_t s) \
@ -1173,7 +1193,8 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \
sgn = 0; \
break; \
default: \
dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE); \
dfp_invalid_op_vxcvi_##size(&dfp); \
set_dfp##size(t, &dfp.vt); \
return; \
} \
} \
@ -1183,7 +1204,8 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \
digits[(size) / 4 - n] = dfp_get_bcd_digit_##size(&dfp.vb, \
offset++); \
if (digits[(size) / 4 - n] > 10) { \
dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE); \
dfp_invalid_op_vxcvi_##size(&dfp); \
set_dfp##size(t, &dfp.vt); \
return; \
} else { \
nonzero |= (digits[(size) / 4 - n] > 0); \