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| author | Víctor Colombo | 2022-09-06 14:55:19 +0200 |
|---|---|---|
| committer | Daniel Henrique Barboza | 2022-09-20 15:54:06 +0200 |
| commit | 3ecec4c0429f65de1822b881ea732689cf647254 (patch) | |
| tree | 3de646cedf3993aa5041e66d30b325cae0274b2c /target | |
| parent | target/ppc: Zero second doubleword in DFP instructions (diff) | |
| download | qemu-3ecec4c0429f65de1822b881ea732689cf647254.tar.gz qemu-3ecec4c0429f65de1822b881ea732689cf647254.tar.xz qemu-3ecec4c0429f65de1822b881ea732689cf647254.zip | |
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>
Diffstat (limited to 'target')
| -rw-r--r-- | target/ppc/dfp_helper.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/target/ppc/dfp_helper.c b/target/ppc/dfp_helper.c index be7aa5357a..cc024316d5 100644 --- a/target/ppc/dfp_helper.c +++ b/target/ppc/dfp_helper.c @@ -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); \ |