[RFC PATCH 17/29] arm64/sve: signal: Dump Scalable Vector Extension registers to user stack
Dave Martin <[email protected]>
| Newsgroups | gmane.comp.gdb.devel,gmane.linux.ports.arm.kernel,gmane.comp.lib.glibc.alpha |
|---|---|
| Message-ID | <[email protected]> |
This patch populates the sve_regs() area reserved on the user stack with the actual register context. Signed-off-by: Dave Martin <[email protected]> --- arch/arm64/include/asm/fpsimd.h | 1 + arch/arm64/kernel/fpsimd.c | 5 ++--- arch/arm64/kernel/signal.c | 8 ++++++++ 3 files changed, 11 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index aa82b38..e39066a 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -93,6 +93,7 @@ extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state); extern void __init fpsimd_init_task_struct_size(void); +extern void *__task_sve_state(struct task_struct *task); extern void sve_save_state(void *state, u32 *pfpsr); extern void sve_load_state(void const *state, u32 const *pfpsr); extern unsigned int sve_get_vl(void); diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 9a90921..4ef2e37 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -128,7 +128,7 @@ void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs) #ifdef CONFIG_ARM64_SVE -static void *__task_sve_state(struct task_struct *task) +void *__task_sve_state(struct task_struct *task) { return (char *)task + ALIGN(sizeof(*task), 16); } @@ -143,8 +143,7 @@ static void *__task_pffr(struct task_struct *task) #else /* !CONFIG_ARM64_SVE */ -/* Turn any non-optimised out attempts to use these into a link error: */ -extern void *__task_sve_state(struct task_struct *task); +/* Turn any non-optimised out attempts to use this into a link error: */ extern void *__task_pffr(struct task_struct *task); #endif /* !CONFIG_ARM64_SVE */ diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 7418237..038e7338 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -229,6 +229,14 @@ static int preserve_sve_context(struct sve_context __user *ctx) BUILD_BUG_ON(sizeof(ctx->__reserved) != sizeof(reserved)); err |= copy_to_user(&ctx->__reserved, reserved, sizeof(reserved)); + /* + * This assumes that the SVE state has already been saved to + * the task struct by calling preserve_fpsimd_context(). + */ + err |= copy_to_user((char __user *)ctx + SVE_SIG_REGS_OFFSET, + __task_sve_state(current), + SVE_SIG_REGS_SIZE(vq)); + return err ? -EFAULT : 0; } -- 2.1.4