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authorMark Rutland <mark.rutland@arm.com>2018-07-11 16:56:41 +0300
committerWill Deacon <will.deacon@arm.com>2018-07-12 16:40:39 +0300
commit3085e1645e23888125224f66a710077cdb03106a (patch)
treea0aa48b29c26aa10c8d7e07fb0a5da7edac7b28b /arch/arm64/include/asm/unistd32.h
parentf9209e26293300db80a57a6bf2f71ccb26ad45db (diff)
downloadlinux-3085e1645e23888125224f66a710077cdb03106a.tar.xz
arm64: remove sigreturn wrappers
The arm64 sigreturn* syscall handlers are non-standard. Rather than taking a number of user parameters in registers as per the AAPCS, they expect the pt_regs as their sole argument. To make this work, we override the syscall definitions to invoke wrappers written in assembly, which mov the SP into x0, and branch to their respective C functions. On other architectures (such as x86), the sigreturn* functions take no argument and instead use current_pt_regs() to acquire the user registers. This requires less boilerplate code, and allows for other features such as interposing C code in this path. This patch takes the same approach for arm64. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tentatively-reviewed-by: Dave Martin <dave.martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/unistd32.h')
-rw-r--r--arch/arm64/include/asm/unistd32.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 0fdc7ef8a776..023d64af8339 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -260,7 +260,7 @@ __SYSCALL(117, sys_ni_syscall)
#define __NR_fsync 118
__SYSCALL(__NR_fsync, sys_fsync)
#define __NR_sigreturn 119
-__SYSCALL(__NR_sigreturn, compat_sys_sigreturn_wrapper)
+__SYSCALL(__NR_sigreturn, compat_sys_sigreturn)
#define __NR_clone 120
__SYSCALL(__NR_clone, sys_clone)
#define __NR_setdomainname 121
@@ -368,7 +368,7 @@ __SYSCALL(__NR_getresgid, sys_getresgid16)
#define __NR_prctl 172
__SYSCALL(__NR_prctl, sys_prctl)
#define __NR_rt_sigreturn 173
-__SYSCALL(__NR_rt_sigreturn, compat_sys_rt_sigreturn_wrapper)
+__SYSCALL(__NR_rt_sigreturn, compat_sys_rt_sigreturn)
#define __NR_rt_sigaction 174
__SYSCALL(__NR_rt_sigaction, compat_sys_rt_sigaction)
#define __NR_rt_sigprocmask 175