Commit 8b7a87a0 authored by Max Filippov's avatar Max Filippov
Browse files

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: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent ef1a935c

arch/xtensa/include/uapi/asm/ptrace.h

+2 −1
Original line number Diff line number Diff line
@@ -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];

};

arch/xtensa/kernel/ptrace.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

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