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linux-user/loongarch64: Add LSX sigcontext save/restore 

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231101030816.2353416-6-gaosong@loongson.cn>
This commit is contained in:
Song Gao 2023-11-01 11:08:15 +08:00
parent 7c0ea81ce6
commit 90ea967d14
1 changed files with 89 additions and 22 deletions
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111
linux-user/loongarch64/signal.c
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@ -41,6 +41,14 @@ struct target_fpu_context {
QEMU_BUILD_BUG_ON(offsetof(struct target_fpu_context, regs)
!= offsetof_fpucontext_fr);
#define LSX_CTX_MAGIC 0x53580001
#define LSX_CTX_ALIGN 16
struct target_lsx_context {
abi_ulong regs[2 * 32];
abi_ulong fcc;
abi_uint fcsr;
} QEMU_ALIGNED(LSX_CTX_ALIGN);
#define CONTEXT_INFO_ALIGN 16
struct target_sctx_info {
abi_uint magic;
@ -81,9 +89,10 @@ struct ctx_layout {
};
struct extctx_layout {
unsigned int size;
unsigned long size;
unsigned int flags;
struct ctx_layout fpu;
struct ctx_layout lsx;
struct ctx_layout end;
};
@ -105,7 +114,8 @@ static abi_ptr extframe_alloc(struct extctx_layout *extctx,
return sp;
}
static abi_ptr setup_extcontext(struct extctx_layout *extctx, abi_ptr sp)
static abi_ptr setup_extcontext(CPULoongArchState *env,
struct extctx_layout *extctx, abi_ptr sp)
{
memset(extctx, 0, sizeof(struct extctx_layout));
@ -114,8 +124,15 @@ static abi_ptr setup_extcontext(struct extctx_layout *extctx, abi_ptr sp)
/* For qemu, there is no lazy fp context switch, so fp always present. */
extctx->flags = SC_USED_FP;
sp = extframe_alloc(extctx, &extctx->fpu,
if (FIELD_EX64(env->CSR_EUEN, CSR_EUEN, SXE)) {
sp = extframe_alloc(extctx, &extctx->lsx,
sizeof(struct target_lsx_context), LSX_CTX_ALIGN, sp);
} else {
sp = extframe_alloc(extctx, &extctx->fpu,
sizeof(struct target_fpu_context), FPU_CTX_ALIGN, sp);
}
return sp;
}
@ -125,7 +142,6 @@ static void setup_sigframe(CPULoongArchState *env,
struct extctx_layout *extctx)
{
struct target_sctx_info *info;
struct target_fpu_context *fpu_ctx;
int i;
__put_user(extctx->flags, &sc->sc_flags);
@ -136,18 +152,39 @@ static void setup_sigframe(CPULoongArchState *env,
}
/*
* Set fpu context
* Set extension context
*/
info = extctx->fpu.haddr;
__put_user(FPU_CTX_MAGIC, &info->magic);
__put_user(extctx->fpu.size, &info->size);
fpu_ctx = (struct target_fpu_context *)(info + 1);
for (i = 0; i < 32; ++i) {
__put_user(env->fpr[i].vreg.D(0), &fpu_ctx->regs[i]);
if (FIELD_EX64(env->CSR_EUEN, CSR_EUEN, SXE)) {
struct target_lsx_context *lsx_ctx;
info = extctx->lsx.haddr;
__put_user(LSX_CTX_MAGIC, &info->magic);
__put_user(extctx->lsx.size, &info->size);
lsx_ctx = (struct target_lsx_context *)(info + 1);
for (i = 0; i < 32; ++i) {
__put_user(env->fpr[i].vreg.UD(0), &lsx_ctx->regs[2 * i]);
__put_user(env->fpr[i].vreg.UD(1), &lsx_ctx->regs[2 * i + 1]);
}
__put_user(read_fcc(env), &lsx_ctx->fcc);
__put_user(env->fcsr0, &lsx_ctx->fcsr);
} else {
struct target_fpu_context *fpu_ctx;
info = extctx->fpu.haddr;
__put_user(FPU_CTX_MAGIC, &info->magic);
__put_user(extctx->fpu.size, &info->size);
fpu_ctx = (struct target_fpu_context *)(info + 1);
for (i = 0; i < 32; ++i) {
__put_user(env->fpr[i].vreg.UD(0), &fpu_ctx->regs[i]);
}
__put_user(read_fcc(env), &fpu_ctx->fcc);
__put_user(env->fcsr0, &fpu_ctx->fcsr);
}
__put_user(read_fcc(env), &fpu_ctx->fcc);
__put_user(env->fcsr0, &fpu_ctx->fcsr);
/*
* Set end context
@ -184,6 +221,15 @@ static bool parse_extcontext(struct extctx_layout *extctx, abi_ptr frame)
extctx->fpu.size = size;
extctx->size += size;
break;
case LSX_CTX_MAGIC:
if (size < (sizeof(struct target_sctx_info) +
sizeof(struct target_lsx_context))) {
return false;
}
extctx->lsx.gaddr = frame;
extctx->lsx.size = size;
extctx->size += size;
break;
default:
return false;
}
@ -197,19 +243,31 @@ static void restore_sigframe(CPULoongArchState *env,
struct extctx_layout *extctx)
{
int i;
abi_ulong fcc;
__get_user(env->pc, &sc->sc_pc);
for (i = 1; i < 32; ++i) {
__get_user(env->gpr[i], &sc->sc_regs[i]);
}
if (extctx->fpu.haddr) {
struct target_fpu_context *fpu_ctx =
extctx->fpu.haddr + sizeof(struct target_sctx_info);
abi_ulong fcc;
if (extctx->lsx.haddr) {
struct target_lsx_context *lsx_ctx =
extctx->lsx.haddr + sizeof(struct target_sctx_info);
for (i = 0; i < 32; ++i) {
__get_user(env->fpr[i].vreg.D(0), &fpu_ctx->regs[i]);
__get_user(env->fpr[i].vreg.UD(0), &lsx_ctx->regs[2 * i]);
__get_user(env->fpr[i].vreg.UD(1), &lsx_ctx->regs[2 * i + 1]);
}
__get_user(fcc, &lsx_ctx->fcc);
write_fcc(env, fcc);
__get_user(env->fcsr0, &lsx_ctx->fcsr);
restore_fp_status(env);
} else if (extctx->fpu.haddr) {
struct target_fpu_context *fpu_ctx =
extctx->fpu.haddr + sizeof(struct target_sctx_info);
for (i = 0; i < 32; ++i) {
__get_user(env->fpr[i].vreg.UD(0), &fpu_ctx->regs[i]);
}
__get_user(fcc, &fpu_ctx->fcc);
write_fcc(env, fcc);
@ -229,7 +287,7 @@ static abi_ptr get_sigframe(struct target_sigaction *ka,
sp = target_sigsp(get_sp_from_cpustate(env), ka);
sp = ROUND_DOWN(sp, 16);
sp = setup_extcontext(extctx, sp);
sp = setup_extcontext(env, extctx, sp);
sp -= sizeof(struct target_rt_sigframe);
assert(QEMU_IS_ALIGNED(sp, 16));
@ -255,8 +313,14 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
force_sigsegv(sig);
return;
}
extctx.fpu.haddr = (void *)frame + (extctx.fpu.gaddr - frame_addr);
extctx.end.haddr = (void *)frame + (extctx.end.gaddr - frame_addr);
if (FIELD_EX64(env->CSR_EUEN, CSR_EUEN, SXE)) {
extctx.lsx.haddr = (void *)frame + (extctx.lsx.gaddr - frame_addr);
extctx.end.haddr = (void *)frame + (extctx.end.gaddr - frame_addr);
} else {
extctx.fpu.haddr = (void *)frame + (extctx.fpu.gaddr - frame_addr);
extctx.end.haddr = (void *)frame + (extctx.end.gaddr - frame_addr);
}
tswap_siginfo(&frame->rs_info, info);
@ -299,7 +363,10 @@ long do_rt_sigreturn(CPULoongArchState *env)
if (!frame) {
goto badframe;
}
if (extctx.fpu.gaddr) {
if (extctx.lsx.gaddr) {
extctx.lsx.haddr = (void *)frame + (extctx.lsx.gaddr - frame_addr);
} else if (extctx.fpu.gaddr) {
extctx.fpu.haddr = (void *)frame + (extctx.fpu.gaddr - frame_addr);
}