summaryrefslogtreecommitdiff
path: root/arch/arm64/include/asm/ptrace.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/include/asm/ptrace.h')
-rw-r--r--arch/arm64/include/asm/ptrace.h31
1 files changed, 30 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 11403fdd0a50..6069d66e0bc2 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -72,8 +72,19 @@
#define COMPAT_PT_TEXT_ADDR 0x10000
#define COMPAT_PT_DATA_ADDR 0x10004
#define COMPAT_PT_TEXT_END_ADDR 0x10008
+
+/*
+ * If pt_regs.syscallno == NO_SYSCALL, then the thread is not executing
+ * a syscall -- i.e., its most recent entry into the kernel from
+ * userspace was not via SVC, or otherwise a tracer cancelled the syscall.
+ *
+ * This must have the value -1, for ABI compatibility with ptrace etc.
+ */
+#define NO_SYSCALL (-1)
+
#ifndef __ASSEMBLY__
#include <linux/bug.h>
+#include <linux/types.h>
/* sizeof(struct user) for AArch32 */
#define COMPAT_USER_SZ 296
@@ -116,11 +127,29 @@ struct pt_regs {
};
};
u64 orig_x0;
- u64 syscallno;
+#ifdef __AARCH64EB__
+ u32 unused2;
+ s32 syscallno;
+#else
+ s32 syscallno;
+ u32 unused2;
+#endif
+
u64 orig_addr_limit;
u64 unused; // maintain 16 byte alignment
+ u64 stackframe[2];
};
+static inline bool in_syscall(struct pt_regs const *regs)
+{
+ return regs->syscallno != NO_SYSCALL;
+}
+
+static inline void forget_syscall(struct pt_regs *regs)
+{
+ regs->syscallno = NO_SYSCALL;
+}
+
#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
#define arch_has_single_step() (1)