thread_info->syscall is used only for ptrace, but syscall number is also used by syscall_get_nr and returned to userspace by the following proc file access:
$ cat /proc/self/syscall 0 0x3 0xbe928bd8 0x1000 0x0 0xac9e0 0x3 0xbe928bb4 0xb6f5dfbc ^ The first number is the syscall number, currently it is zero. Patch fixes this: $ cat /proc/self/syscall 3 0x3 0xbefc7bd8 0x1000 0x0 0xac9e0 0x3 0xbefc7bb4 0xb6e82fbc ^ Right, read syscall Signed-off-by: Roman Pen <[email protected]> Cc: Russell King <[email protected]> Cc: Marc Zyngier <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Christoffer Dall <[email protected]> Cc: Stefano Stabellini <[email protected]> Cc: Sekhar Nori <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] --- arch/arm/kernel/asm-offsets.c | 1 + arch/arm/kernel/entry-common.S | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c index 2d2d608..6911bad 100644 --- a/arch/arm/kernel/asm-offsets.c +++ b/arch/arm/kernel/asm-offsets.c @@ -70,6 +70,7 @@ int main(void) DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); DEFINE(TI_CPU_DOMAIN, offsetof(struct thread_info, cpu_domain)); DEFINE(TI_CPU_SAVE, offsetof(struct thread_info, cpu_context)); + DEFINE(TI_SYSCALL, offsetof(struct thread_info, syscall)); DEFINE(TI_USED_CP, offsetof(struct thread_info, used_cp)); DEFINE(TI_TP_VALUE, offsetof(struct thread_info, tp_value)); DEFINE(TI_FPSTATE, offsetof(struct thread_info, fpstate)); diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index f8ccc21..89452ff 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -189,6 +189,7 @@ ENTRY(vector_swi) #endif local_restart: + str scno, [tsk, #TI_SYSCALL] @ set syscall number ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing stmdb sp!, {r4, r5} @ push fifth and sixth args -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
