diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2018-07-11 16:56:41 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-07-12 16:40:39 +0300 |
| commit | 3085e1645e23888125224f66a710077cdb03106a (patch) | |
| tree | a0aa48b29c26aa10c8d7e07fb0a5da7edac7b28b /arch/arm64/include/asm/unistd32.h | |
| parent | f9209e26293300db80a57a6bf2f71ccb26ad45db (diff) | |
| download | linux-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.h | 4 |
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 |