diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2020-07-18 17:47:43 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2020-07-28 00:57:05 -0700 |
| commit | 8b7a87a03f7c15c7a1e1647c3527292604e80f6f (patch) | |
| tree | d74522605da28d8d06f4874f8f4822a9657adb78 | |
| parent | ef1a935c08ea97436f62edb0b1427d60e31b777b (diff) | |
xtensa: expose syscall through user_pt_regs
Use one of the reserved slots in struct user_pt_regs to return syscall
number in the GPR regset. Update syscall number from the GPR regset only
when it's non-zero.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| -rw-r--r-- | arch/xtensa/include/uapi/asm/ptrace.h | 3 | ||||
| -rw-r--r-- | arch/xtensa/kernel/ptrace.c | 4 |
2 files changed, 6 insertions, 1 deletions
diff --git a/arch/xtensa/include/uapi/asm/ptrace.h b/arch/xtensa/include/uapi/asm/ptrace.h index 2ec0f9100a06..50db3e0a6341 100644 --- a/arch/xtensa/include/uapi/asm/ptrace.h +++ b/arch/xtensa/include/uapi/asm/ptrace.h @@ -50,7 +50,8 @@ struct user_pt_regs { __u32 windowstart; __u32 windowbase; __u32 threadptr; - __u32 reserved[7 + 48]; + __u32 syscall; + __u32 reserved[6 + 48]; __u32 a[64]; }; diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index 0278d7dfb4d6..437b4297948d 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -52,6 +52,7 @@ static int gpr_get(struct task_struct *target, .threadptr = regs->threadptr, .windowbase = regs->windowbase, .windowstart = regs->windowstart, + .syscall = regs->syscall, }; memcpy(newregs.a, @@ -91,6 +92,9 @@ static int gpr_set(struct task_struct *target, regs->sar = newregs.sar; regs->threadptr = newregs.threadptr; + if (newregs.syscall) + regs->syscall = newregs.syscall; + if (newregs.windowbase != regs->windowbase || newregs.windowstart != regs->windowstart) { u32 rotws, wmask; |