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target/ppc: Fix SPE unavailable exception triggering 

When emulating certain floating point instructions or vector instructions on
PowerPC machines, QEMU did not properly generate the SPE/Embedded Floating-
Point Unavailable interrupt. See the buglink further below for references to
the relevant NXP documentation.

This patch fixes the behavior of some evfs* instructions that were
incorrectly emitting the interrupt.

More importantly, this patch fixes the behavior of several efd* and ev*
instructions that were not generating the interrupt. Triggering the
interrupt for these instructions fixes lazy FPU/vector context switching on
some operating systems like Linux.

Without this patch, the result of some double-precision arithmetic could be
corrupted due to the lack of proper saving and restoring of the upper
32-bit part of the general-purpose registers.

Buglink: https://bugs.launchpad.net/qemu/+bug/1888918
Buglink: https://bugs.launchpad.net/qemu/+bug/1611394
Signed-off-by: Matthieu Bucchianeri <matthieu.bucchianeri@leostella.com>
Message-Id: <20200727175553.32276-1-matthieu.bucchianeri@leostella.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
master
Matthieu Bucchianeri 2020-07-27 10:55:53 -07:00 committed by David Gibson
parent c4b8b49d68
commit 8dcdb535d7
1 changed files with 64 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
target/ppc/translate/spe-impl.inc.c
View File

@ -349,14 +349,24 @@ static inline void gen_evmergelohi(DisasContext *ctx)
}
static inline void gen_evsplati(DisasContext *ctx)
{
uint64_t imm = ((int32_t)(rA(ctx->opcode) << 27)) >> 27;
uint64_t imm;
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
imm = ((int32_t)(rA(ctx->opcode) << 27)) >> 27;
tcg_gen_movi_tl(cpu_gpr[rD(ctx->opcode)], imm);
tcg_gen_movi_tl(cpu_gprh[rD(ctx->opcode)], imm);
}
static inline void gen_evsplatfi(DisasContext *ctx)
{
uint64_t imm = rA(ctx->opcode) << 27;
uint64_t imm;
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
imm = rA(ctx->opcode) << 27;
tcg_gen_movi_tl(cpu_gpr[rD(ctx->opcode)], imm);
tcg_gen_movi_tl(cpu_gprh[rD(ctx->opcode)], imm);
@ -389,21 +399,37 @@ static inline void gen_evsel(DisasContext *ctx)
static void gen_evsel0(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
gen_evsel(ctx);
}
static void gen_evsel1(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
gen_evsel(ctx);
}
static void gen_evsel2(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
gen_evsel(ctx);
}
static void gen_evsel3(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
gen_evsel(ctx);
}
@ -518,6 +544,11 @@ static inline void gen_evmwsmia(DisasContext *ctx)
{
TCGv_i64 tmp;
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
gen_evmwsmi(ctx); /* rD := rA * rB */
tmp = tcg_temp_new_i64();
@ -534,6 +565,11 @@ static inline void gen_evmwsmiaa(DisasContext *ctx)
TCGv_i64 acc;
TCGv_i64 tmp;
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
gen_evmwsmi(ctx); /* rD := rA * rB */
acc = tcg_temp_new_i64();
@ -892,8 +928,14 @@ static inline void gen_##name(DisasContext *ctx) \
#define GEN_SPEFPUOP_CONV_32_64(name) \
static inline void gen_##name(DisasContext *ctx) \
{ \
TCGv_i64 t0 = tcg_temp_new_i64(); \
TCGv_i32 t1 = tcg_temp_new_i32(); \
TCGv_i64 t0; \
TCGv_i32 t1; \
if (unlikely(!ctx->spe_enabled)) { \
gen_exception(ctx, POWERPC_EXCP_SPEU); \
return; \
} \
t0 = tcg_temp_new_i64(); \
t1 = tcg_temp_new_i32(); \
gen_load_gpr64(t0, rB(ctx->opcode)); \
gen_helper_##name(t1, cpu_env, t0); \
tcg_gen_extu_i32_tl(cpu_gpr[rD(ctx->opcode)], t1); \
@ -903,8 +945,14 @@ static inline void gen_##name(DisasContext *ctx) \
#define GEN_SPEFPUOP_CONV_64_32(name) \
static inline void gen_##name(DisasContext *ctx) \
{ \
TCGv_i64 t0 = tcg_temp_new_i64(); \
TCGv_i32 t1 = tcg_temp_new_i32(); \
TCGv_i64 t0; \
TCGv_i32 t1; \
if (unlikely(!ctx->spe_enabled)) { \
gen_exception(ctx, POWERPC_EXCP_SPEU); \
return; \
} \
t0 = tcg_temp_new_i64(); \
t1 = tcg_temp_new_i32(); \
tcg_gen_trunc_tl_i32(t1, cpu_gpr[rB(ctx->opcode)]); \
gen_helper_##name(t0, cpu_env, t1); \
gen_store_gpr64(rD(ctx->opcode), t0); \
@ -914,7 +962,12 @@ static inline void gen_##name(DisasContext *ctx) \
#define GEN_SPEFPUOP_CONV_64_64(name) \
static inline void gen_##name(DisasContext *ctx) \
{ \
TCGv_i64 t0 = tcg_temp_new_i64(); \
TCGv_i64 t0; \
if (unlikely(!ctx->spe_enabled)) { \
gen_exception(ctx, POWERPC_EXCP_SPEU); \
return; \
} \
t0 = tcg_temp_new_i64(); \
gen_load_gpr64(t0, rB(ctx->opcode)); \
gen_helper_##name(t0, cpu_env, t0); \
gen_store_gpr64(rD(ctx->opcode), t0); \
@ -923,13 +976,8 @@ static inline void gen_##name(DisasContext *ctx) \
#define GEN_SPEFPUOP_ARITH2_32_32(name) \
static inline void gen_##name(DisasContext *ctx) \
{ \
TCGv_i32 t0, t1; \
if (unlikely(!ctx->spe_enabled)) { \
gen_exception(ctx, POWERPC_EXCP_SPEU); \
return; \
} \
t0 = tcg_temp_new_i32(); \
t1 = tcg_temp_new_i32(); \
TCGv_i32 t0 = tcg_temp_new_i32(); \
TCGv_i32 t1 = tcg_temp_new_i32(); \
tcg_gen_trunc_tl_i32(t0, cpu_gpr[rA(ctx->opcode)]); \
tcg_gen_trunc_tl_i32(t1, cpu_gpr[rB(ctx->opcode)]); \
gen_helper_##name(t0, cpu_env, t0, t1); \
@ -958,13 +1006,8 @@ static inline void gen_##name(DisasContext *ctx) \
#define GEN_SPEFPUOP_COMP_32(name) \
static inline void gen_##name(DisasContext *ctx) \
{ \
TCGv_i32 t0, t1; \
if (unlikely(!ctx->spe_enabled)) { \
gen_exception(ctx, POWERPC_EXCP_SPEU); \
return; \
} \
t0 = tcg_temp_new_i32(); \
t1 = tcg_temp_new_i32(); \
TCGv_i32 t0 = tcg_temp_new_i32(); \
TCGv_i32 t1 = tcg_temp_new_i32(); \
\
tcg_gen_trunc_tl_i32(t0, cpu_gpr[rA(ctx->opcode)]); \
tcg_gen_trunc_tl_i32(t1, cpu_gpr[rB(ctx->opcode)]); \
@ -1074,28 +1117,16 @@ GEN_SPEFPUOP_ARITH2_32_32(efsmul);
GEN_SPEFPUOP_ARITH2_32_32(efsdiv);
static inline void gen_efsabs(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
tcg_gen_andi_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
(target_long)~0x80000000LL);
}
static inline void gen_efsnabs(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
tcg_gen_ori_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
0x80000000);
}
static inline void gen_efsneg(DisasContext *ctx)
{
if (unlikely(!ctx->spe_enabled)) {
gen_exception(ctx, POWERPC_EXCP_SPEU);
return;
}
tcg_gen_xori_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
0x80000000);
}