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-rw-r--r--arch/loongarch/kernel/signal.c326
1 files changed, 323 insertions, 3 deletions
diff --git a/arch/loongarch/kernel/signal.c b/arch/loongarch/kernel/signal.c
index 8f5b7986374b..ceb899366c0a 100644
--- a/arch/loongarch/kernel/signal.c
+++ b/arch/loongarch/kernel/signal.c
@@ -50,6 +50,14 @@ extern asmlinkage int
_save_fp_context(void __user *fpregs, void __user *fcc, void __user *csr);
extern asmlinkage int
_restore_fp_context(void __user *fpregs, void __user *fcc, void __user *csr);
+extern asmlinkage int
+_save_lsx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
+extern asmlinkage int
+_restore_lsx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
+extern asmlinkage int
+_save_lasx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
+extern asmlinkage int
+_restore_lasx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
struct rt_sigframe {
struct siginfo rs_info;
@@ -65,6 +73,8 @@ struct extctx_layout {
unsigned long size;
unsigned int flags;
struct _ctx_layout fpu;
+ struct _ctx_layout lsx;
+ struct _ctx_layout lasx;
struct _ctx_layout end;
};
@@ -115,6 +125,96 @@ static int copy_fpu_from_sigcontext(struct fpu_context __user *ctx)
return err;
}
+static int copy_lsx_to_sigcontext(struct lsx_context __user *ctx)
+{
+ int i;
+ int err = 0;
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |= __put_user(get_fpr64(&current->thread.fpu.fpr[i], 0),
+ &regs[2*i]);
+ err |= __put_user(get_fpr64(&current->thread.fpu.fpr[i], 1),
+ &regs[2*i+1]);
+ }
+ err |= __put_user(current->thread.fpu.fcc, fcc);
+ err |= __put_user(current->thread.fpu.fcsr, fcsr);
+
+ return err;
+}
+
+static int copy_lsx_from_sigcontext(struct lsx_context __user *ctx)
+{
+ int i;
+ int err = 0;
+ u64 fpr_val;
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |= __get_user(fpr_val, &regs[2*i]);
+ set_fpr64(&current->thread.fpu.fpr[i], 0, fpr_val);
+ err |= __get_user(fpr_val, &regs[2*i+1]);
+ set_fpr64(&current->thread.fpu.fpr[i], 1, fpr_val);
+ }
+ err |= __get_user(current->thread.fpu.fcc, fcc);
+ err |= __get_user(current->thread.fpu.fcsr, fcsr);
+
+ return err;
+}
+
+static int copy_lasx_to_sigcontext(struct lasx_context __user *ctx)
+{
+ int i;
+ int err = 0;
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |= __put_user(get_fpr64(&current->thread.fpu.fpr[i], 0),
+ &regs[4*i]);
+ err |= __put_user(get_fpr64(&current->thread.fpu.fpr[i], 1),
+ &regs[4*i+1]);
+ err |= __put_user(get_fpr64(&current->thread.fpu.fpr[i], 2),
+ &regs[4*i+2]);
+ err |= __put_user(get_fpr64(&current->thread.fpu.fpr[i], 3),
+ &regs[4*i+3]);
+ }
+ err |= __put_user(current->thread.fpu.fcc, fcc);
+ err |= __put_user(current->thread.fpu.fcsr, fcsr);
+
+ return err;
+}
+
+static int copy_lasx_from_sigcontext(struct lasx_context __user *ctx)
+{
+ int i;
+ int err = 0;
+ u64 fpr_val;
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |= __get_user(fpr_val, &regs[4*i]);
+ set_fpr64(&current->thread.fpu.fpr[i], 0, fpr_val);
+ err |= __get_user(fpr_val, &regs[4*i+1]);
+ set_fpr64(&current->thread.fpu.fpr[i], 1, fpr_val);
+ err |= __get_user(fpr_val, &regs[4*i+2]);
+ set_fpr64(&current->thread.fpu.fpr[i], 2, fpr_val);
+ err |= __get_user(fpr_val, &regs[4*i+3]);
+ set_fpr64(&current->thread.fpu.fpr[i], 3, fpr_val);
+ }
+ err |= __get_user(current->thread.fpu.fcc, fcc);
+ err |= __get_user(current->thread.fpu.fcsr, fcsr);
+
+ return err;
+}
+
/*
* Wrappers for the assembly _{save,restore}_fp_context functions.
*/
@@ -136,6 +236,42 @@ static int restore_hw_fpu_context(struct fpu_context __user *ctx)
return _restore_fp_context(regs, fcc, fcsr);
}
+static int save_hw_lsx_context(struct lsx_context __user *ctx)
+{
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ return _save_lsx_context(regs, fcc, fcsr);
+}
+
+static int restore_hw_lsx_context(struct lsx_context __user *ctx)
+{
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ return _restore_lsx_context(regs, fcc, fcsr);
+}
+
+static int save_hw_lasx_context(struct lasx_context __user *ctx)
+{
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ return _save_lasx_context(regs, fcc, fcsr);
+}
+
+static int restore_hw_lasx_context(struct lasx_context __user *ctx)
+{
+ uint64_t __user *regs = (uint64_t *)&ctx->regs;
+ uint64_t __user *fcc = &ctx->fcc;
+ uint32_t __user *fcsr = &ctx->fcsr;
+
+ return _restore_lasx_context(regs, fcc, fcsr);
+}
+
static int fcsr_pending(unsigned int __user *fcsr)
{
int err, sig = 0;
@@ -227,6 +363,162 @@ static int protected_restore_fpu_context(struct extctx_layout *extctx)
return err ?: sig;
}
+static int protected_save_lsx_context(struct extctx_layout *extctx)
+{
+ int err = 0;
+ struct sctx_info __user *info = extctx->lsx.addr;
+ struct lsx_context __user *lsx_ctx = (struct lsx_context *)get_ctx_through_ctxinfo(info);
+ uint64_t __user *regs = (uint64_t *)&lsx_ctx->regs;
+ uint64_t __user *fcc = &lsx_ctx->fcc;
+ uint32_t __user *fcsr = &lsx_ctx->fcsr;
+
+ while (1) {
+ lock_fpu_owner();
+ if (is_lsx_enabled())
+ err = save_hw_lsx_context(lsx_ctx);
+ else {
+ if (is_fpu_owner())
+ save_fp(current);
+ err = copy_lsx_to_sigcontext(lsx_ctx);
+ }
+ unlock_fpu_owner();
+
+ err |= __put_user(LSX_CTX_MAGIC, &info->magic);
+ err |= __put_user(extctx->lsx.size, &info->size);
+
+ if (likely(!err))
+ break;
+ /* Touch the LSX context and try again */
+ err = __put_user(0, &regs[0]) |
+ __put_user(0, &regs[32*2-1]) |
+ __put_user(0, fcc) |
+ __put_user(0, fcsr);
+ if (err)
+ return err; /* really bad sigcontext */
+ }
+
+ return err;
+}
+
+static int protected_restore_lsx_context(struct extctx_layout *extctx)
+{
+ int err = 0, sig = 0, tmp __maybe_unused;
+ struct sctx_info __user *info = extctx->lsx.addr;
+ struct lsx_context __user *lsx_ctx = (struct lsx_context *)get_ctx_through_ctxinfo(info);
+ uint64_t __user *regs = (uint64_t *)&lsx_ctx->regs;
+ uint64_t __user *fcc = &lsx_ctx->fcc;
+ uint32_t __user *fcsr = &lsx_ctx->fcsr;
+
+ err = sig = fcsr_pending(fcsr);
+ if (err < 0)
+ return err;
+
+ while (1) {
+ lock_fpu_owner();
+ if (is_lsx_enabled())
+ err = restore_hw_lsx_context(lsx_ctx);
+ else {
+ err = copy_lsx_from_sigcontext(lsx_ctx);
+ if (is_fpu_owner())
+ restore_fp(current);
+ }
+ unlock_fpu_owner();
+
+ if (likely(!err))
+ break;
+ /* Touch the LSX context and try again */
+ err = __get_user(tmp, &regs[0]) |
+ __get_user(tmp, &regs[32*2-1]) |
+ __get_user(tmp, fcc) |
+ __get_user(tmp, fcsr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+
+ return err ?: sig;
+}
+
+static int protected_save_lasx_context(struct extctx_layout *extctx)
+{
+ int err = 0;
+ struct sctx_info __user *info = extctx->lasx.addr;
+ struct lasx_context __user *lasx_ctx =
+ (struct lasx_context *)get_ctx_through_ctxinfo(info);
+ uint64_t __user *regs = (uint64_t *)&lasx_ctx->regs;
+ uint64_t __user *fcc = &lasx_ctx->fcc;
+ uint32_t __user *fcsr = &lasx_ctx->fcsr;
+
+ while (1) {
+ lock_fpu_owner();
+ if (is_lasx_enabled())
+ err = save_hw_lasx_context(lasx_ctx);
+ else {
+ if (is_lsx_enabled())
+ save_lsx(current);
+ else if (is_fpu_owner())
+ save_fp(current);
+ err = copy_lasx_to_sigcontext(lasx_ctx);
+ }
+ unlock_fpu_owner();
+
+ err |= __put_user(LASX_CTX_MAGIC, &info->magic);
+ err |= __put_user(extctx->lasx.size, &info->size);
+
+ if (likely(!err))
+ break;
+ /* Touch the LASX context and try again */
+ err = __put_user(0, &regs[0]) |
+ __put_user(0, &regs[32*4-1]) |
+ __put_user(0, fcc) |
+ __put_user(0, fcsr);
+ if (err)
+ return err; /* really bad sigcontext */
+ }
+
+ return err;
+}
+
+static int protected_restore_lasx_context(struct extctx_layout *extctx)
+{
+ int err = 0, sig = 0, tmp __maybe_unused;
+ struct sctx_info __user *info = extctx->lasx.addr;
+ struct lasx_context __user *lasx_ctx =
+ (struct lasx_context *)get_ctx_through_ctxinfo(info);
+ uint64_t __user *regs = (uint64_t *)&lasx_ctx->regs;
+ uint64_t __user *fcc = &lasx_ctx->fcc;
+ uint32_t __user *fcsr = &lasx_ctx->fcsr;
+
+ err = sig = fcsr_pending(fcsr);
+ if (err < 0)
+ return err;
+
+ while (1) {
+ lock_fpu_owner();
+ if (is_lasx_enabled())
+ err = restore_hw_lasx_context(lasx_ctx);
+ else {
+ err = copy_lasx_from_sigcontext(lasx_ctx);
+ if (is_lsx_enabled())
+ restore_lsx(current);
+ else if (is_fpu_owner())
+ restore_fp(current);
+ }
+ unlock_fpu_owner();
+
+ if (likely(!err))
+ break;
+ /* Touch the LASX context and try again */
+ err = __get_user(tmp, &regs[0]) |
+ __get_user(tmp, &regs[32*4-1]) |
+ __get_user(tmp, fcc) |
+ __get_user(tmp, fcsr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+
+ return err ?: sig;
+}
+
static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
struct extctx_layout *extctx)
{
@@ -240,7 +532,11 @@ static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
for (i = 1; i < 32; i++)
err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
- if (extctx->fpu.addr)
+ if (extctx->lasx.addr)
+ err |= protected_save_lasx_context(extctx);
+ else if (extctx->lsx.addr)
+ err |= protected_save_lsx_context(extctx);
+ else if (extctx->fpu.addr)
err |= protected_save_fpu_context(extctx);
/* Set the "end" magic */
@@ -274,6 +570,20 @@ static int parse_extcontext(struct sigcontext __user *sc, struct extctx_layout *
extctx->fpu.addr = info;
break;
+ case LSX_CTX_MAGIC:
+ if (size < (sizeof(struct sctx_info) +
+ sizeof(struct lsx_context)))
+ goto invalid;
+ extctx->lsx.addr = info;
+ break;
+
+ case LASX_CTX_MAGIC:
+ if (size < (sizeof(struct sctx_info) +
+ sizeof(struct lasx_context)))
+ goto invalid;
+ extctx->lasx.addr = info;
+ break;
+
default:
goto invalid;
}
@@ -319,7 +629,11 @@ static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc
for (i = 1; i < 32; i++)
err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
- if (extctx.fpu.addr)
+ if (extctx.lasx.addr)
+ err |= protected_restore_lasx_context(&extctx);
+ else if (extctx.lsx.addr)
+ err |= protected_restore_lsx_context(&extctx);
+ else if (extctx.fpu.addr)
err |= protected_restore_fpu_context(&extctx);
bad:
@@ -375,7 +689,13 @@ static unsigned long setup_extcontext(struct extctx_layout *extctx, unsigned lon
extctx->size += extctx->end.size;
if (extctx->flags & SC_USED_FP) {
- if (cpu_has_fpu)
+ if (cpu_has_lasx && thread_lasx_context_live())
+ new_sp = extframe_alloc(extctx, &extctx->lasx,
+ sizeof(struct lasx_context), LASX_CTX_ALIGN, new_sp);
+ else if (cpu_has_lsx && thread_lsx_context_live())
+ new_sp = extframe_alloc(extctx, &extctx->lsx,
+ sizeof(struct lsx_context), LSX_CTX_ALIGN, new_sp);
+ else if (cpu_has_fpu)
new_sp = extframe_alloc(extctx, &extctx->fpu,
sizeof(struct fpu_context), FPU_CTX_ALIGN, new_sp);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 23:35:41 +0100