diff options
Diffstat (limited to 'arch/arm64/include/asm/ptrace.h')
| -rw-r--r-- | arch/arm64/include/asm/ptrace.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index 21c87dc240e1..4f64373b84fd 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 @@ -128,6 +139,16 @@ struct pt_regs { u64 unused; // maintain 16 byte alignment }; +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) |