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Diffstat (limited to 'arch/arm64/kernel/ptrace.c')
-rw-r--r--arch/arm64/kernel/ptrace.c280
1 files changed, 272 insertions, 8 deletions
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 9cbb6123208f..7c44658b316d 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -32,6 +32,7 @@
#include <linux/security.h>
#include <linux/init.h>
#include <linux/signal.h>
+#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/perf_event.h>
#include <linux/hw_breakpoint.h>
@@ -40,6 +41,7 @@
#include <linux/elf.h>
#include <asm/compat.h>
+#include <asm/cpufeature.h>
#include <asm/debug-monitors.h>
#include <asm/pgtable.h>
#include <asm/stacktrace.h>
@@ -618,17 +620,56 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset,
/*
* TODO: update fp accessors for lazy context switching (sync/flush hwstate)
*/
-static int fpr_get(struct task_struct *target, const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
+static int __fpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf, unsigned int start_pos)
{
struct user_fpsimd_state *uregs;
+
+ sve_sync_to_fpsimd(target);
+
uregs = &target->thread.fpsimd_state.user_fpsimd;
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs,
+ start_pos, start_pos + sizeof(*uregs));
+}
+
+static int fpr_get(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
if (target == current)
fpsimd_preserve_current_state();
- return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
+ return __fpr_get(target, regset, pos, count, kbuf, ubuf, 0);
+}
+
+static int __fpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf,
+ unsigned int start_pos)
+{
+ int ret;
+ struct user_fpsimd_state newstate;
+
+ /*
+ * Ensure target->thread.fpsimd_state is up to date, so that a
+ * short copyin can't resurrect stale data.
+ */
+ sve_sync_to_fpsimd(target);
+
+ newstate = target->thread.fpsimd_state.user_fpsimd;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate,
+ start_pos, start_pos + sizeof(newstate));
+ if (ret)
+ return ret;
+
+ target->thread.fpsimd_state.user_fpsimd = newstate;
+
+ return ret;
}
static int fpr_set(struct task_struct *target, const struct user_regset *regset,
@@ -636,15 +677,14 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
const void *kbuf, const void __user *ubuf)
{
int ret;
- struct user_fpsimd_state newstate =
- target->thread.fpsimd_state.user_fpsimd;
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
+ ret = __fpr_set(target, regset, pos, count, kbuf, ubuf, 0);
if (ret)
return ret;
- target->thread.fpsimd_state.user_fpsimd = newstate;
+ sve_sync_from_fpsimd_zeropad(target);
fpsimd_flush_task_state(target);
+
return ret;
}
@@ -702,6 +742,215 @@ static int system_call_set(struct task_struct *target,
return ret;
}
+#ifdef CONFIG_ARM64_SVE
+
+static void sve_init_header_from_task(struct user_sve_header *header,
+ struct task_struct *target)
+{
+ unsigned int vq;
+
+ memset(header, 0, sizeof(*header));
+
+ header->flags = test_tsk_thread_flag(target, TIF_SVE) ?
+ SVE_PT_REGS_SVE : SVE_PT_REGS_FPSIMD;
+ if (test_tsk_thread_flag(target, TIF_SVE_VL_INHERIT))
+ header->flags |= SVE_PT_VL_INHERIT;
+
+ header->vl = target->thread.sve_vl;
+ vq = sve_vq_from_vl(header->vl);
+
+ header->max_vl = sve_max_vl;
+ if (WARN_ON(!sve_vl_valid(sve_max_vl)))
+ header->max_vl = header->vl;
+
+ header->size = SVE_PT_SIZE(vq, header->flags);
+ header->max_size = SVE_PT_SIZE(sve_vq_from_vl(header->max_vl),
+ SVE_PT_REGS_SVE);
+}
+
+static unsigned int sve_size_from_header(struct user_sve_header const *header)
+{
+ return ALIGN(header->size, SVE_VQ_BYTES);
+}
+
+static unsigned int sve_get_size(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ struct user_sve_header header;
+
+ if (!system_supports_sve())
+ return 0;
+
+ sve_init_header_from_task(&header, target);
+ return sve_size_from_header(&header);
+}
+
+static int sve_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+ struct user_sve_header header;
+ unsigned int vq;
+ unsigned long start, end;
+
+ if (!system_supports_sve())
+ return -EINVAL;
+
+ /* Header */
+ sve_init_header_from_task(&header, target);
+ vq = sve_vq_from_vl(header.vl);
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &header,
+ 0, sizeof(header));
+ if (ret)
+ return ret;
+
+ if (target == current)
+ fpsimd_preserve_current_state();
+
+ /* Registers: FPSIMD-only case */
+
+ BUILD_BUG_ON(SVE_PT_FPSIMD_OFFSET != sizeof(header));
+ if ((header.flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD)
+ return __fpr_get(target, regset, pos, count, kbuf, ubuf,
+ SVE_PT_FPSIMD_OFFSET);
+
+ /* Otherwise: full SVE case */
+
+ BUILD_BUG_ON(SVE_PT_SVE_OFFSET != sizeof(header));
+ start = SVE_PT_SVE_OFFSET;
+ end = SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq);
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ target->thread.sve_state,
+ start, end);
+ if (ret)
+ return ret;
+
+ start = end;
+ end = SVE_PT_SVE_FPSR_OFFSET(vq);
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ start, end);
+ if (ret)
+ return ret;
+
+ /*
+ * Copy fpsr, and fpcr which must follow contiguously in
+ * struct fpsimd_state:
+ */
+ start = end;
+ end = SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE;
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.fpsimd_state.fpsr,
+ start, end);
+ if (ret)
+ return ret;
+
+ start = end;
+ end = sve_size_from_header(&header);
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ start, end);
+}
+
+static int sve_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct user_sve_header header;
+ unsigned int vq;
+ unsigned long start, end;
+
+ if (!system_supports_sve())
+ return -EINVAL;
+
+ /* Header */
+ if (count < sizeof(header))
+ return -EINVAL;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &header,
+ 0, sizeof(header));
+ if (ret)
+ goto out;
+
+ /*
+ * Apart from PT_SVE_REGS_MASK, all PT_SVE_* flags are consumed by
+ * sve_set_vector_length(), which will also validate them for us:
+ */
+ ret = sve_set_vector_length(target, header.vl,
+ ((unsigned long)header.flags & ~SVE_PT_REGS_MASK) << 16);
+ if (ret)
+ goto out;
+
+ /* Actual VL set may be less than the user asked for: */
+ vq = sve_vq_from_vl(target->thread.sve_vl);
+
+ /* Registers: FPSIMD-only case */
+
+ BUILD_BUG_ON(SVE_PT_FPSIMD_OFFSET != sizeof(header));
+ if ((header.flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD) {
+ ret = __fpr_set(target, regset, pos, count, kbuf, ubuf,
+ SVE_PT_FPSIMD_OFFSET);
+ clear_tsk_thread_flag(target, TIF_SVE);
+ goto out;
+ }
+
+ /* Otherwise: full SVE case */
+
+ /*
+ * If setting a different VL from the requested VL and there is
+ * register data, the data layout will be wrong: don't even
+ * try to set the registers in this case.
+ */
+ if (count && vq != sve_vq_from_vl(header.vl)) {
+ ret = -EIO;
+ goto out;
+ }
+
+ sve_alloc(target);
+
+ /*
+ * Ensure target->thread.sve_state is up to date with target's
+ * FPSIMD regs, so that a short copyin leaves trailing registers
+ * unmodified.
+ */
+ fpsimd_sync_to_sve(target);
+ set_tsk_thread_flag(target, TIF_SVE);
+
+ BUILD_BUG_ON(SVE_PT_SVE_OFFSET != sizeof(header));
+ start = SVE_PT_SVE_OFFSET;
+ end = SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq);
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ target->thread.sve_state,
+ start, end);
+ if (ret)
+ goto out;
+
+ start = end;
+ end = SVE_PT_SVE_FPSR_OFFSET(vq);
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ start, end);
+ if (ret)
+ goto out;
+
+ /*
+ * Copy fpsr, and fpcr which must follow contiguously in
+ * struct fpsimd_state:
+ */
+ start = end;
+ end = SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.fpsimd_state.fpsr,
+ start, end);
+
+out:
+ fpsimd_flush_task_state(target);
+ return ret;
+}
+
+#endif /* CONFIG_ARM64_SVE */
+
enum aarch64_regset {
REGSET_GPR,
REGSET_FPR,
@@ -711,6 +960,9 @@ enum aarch64_regset {
REGSET_HW_WATCH,
#endif
REGSET_SYSTEM_CALL,
+#ifdef CONFIG_ARM64_SVE
+ REGSET_SVE,
+#endif
};
static const struct user_regset aarch64_regsets[] = {
@@ -768,6 +1020,18 @@ static const struct user_regset aarch64_regsets[] = {
.get = system_call_get,
.set = system_call_set,
},
+#ifdef CONFIG_ARM64_SVE
+ [REGSET_SVE] = { /* Scalable Vector Extension */
+ .core_note_type = NT_ARM_SVE,
+ .n = DIV_ROUND_UP(SVE_PT_SIZE(SVE_VQ_MAX, SVE_PT_REGS_SVE),
+ SVE_VQ_BYTES),
+ .size = SVE_VQ_BYTES,
+ .align = SVE_VQ_BYTES,
+ .get = sve_get,
+ .set = sve_set,
+ .get_size = sve_get_size,
+ },
+#endif
};
static const struct user_regset_view user_aarch64_view = {