diff options
Diffstat (limited to 'arch/arm64/kernel/kuser32.S')
| -rw-r--r-- | arch/arm64/kernel/kuser32.S | 57 |
1 files changed, 48 insertions, 9 deletions
diff --git a/arch/arm64/kernel/kuser32.S b/arch/arm64/kernel/kuser32.S index 8b69ecb1d8bc..63c48ffdf230 100644 --- a/arch/arm64/kernel/kuser32.S +++ b/arch/arm64/kernel/kuser32.S @@ -27,6 +27,9 @@ * * See Documentation/arm/kernel_user_helpers.txt for formal definitions. */ + +#include <asm/unistd32.h> + .align 5 .globl __kuser_helper_start __kuser_helper_start: @@ -35,33 +38,30 @@ __kuser_cmpxchg64: // 0xffff0f60 .inst 0xe92d00f0 // push {r4, r5, r6, r7} .inst 0xe1c040d0 // ldrd r4, r5, [r0] .inst 0xe1c160d0 // ldrd r6, r7, [r1] - .inst 0xf57ff05f // dmb sy - .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] + .inst 0xe1b20e9f // 1: ldaexd r0, r1, [r2] .inst 0xe0303004 // eors r3, r0, r4 .inst 0x00313005 // eoreqs r3, r1, r5 - .inst 0x01a23f96 // strexdeq r3, r6, [r2] + .inst 0x01a23e96 // stlexdeq r3, r6, [r2] .inst 0x03330001 // teqeq r3, #1 .inst 0x0afffff9 // beq 1b - .inst 0xf57ff05f // dmb sy .inst 0xe2730000 // rsbs r0, r3, #0 .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} .inst 0xe12fff1e // bx lr .align 5 __kuser_memory_barrier: // 0xffff0fa0 - .inst 0xf57ff05f // dmb sy + .inst 0xf57ff05b // dmb ish .inst 0xe12fff1e // bx lr .align 5 __kuser_cmpxchg: // 0xffff0fc0 - .inst 0xf57ff05f // dmb sy - .inst 0xe1923f9f // 1: ldrex r3, [r2] + .inst 0xe1923e9f // 1: ldaex r3, [r2] .inst 0xe0533000 // subs r3, r3, r0 - .inst 0x01823f91 // strexeq r3, r1, [r2] + .inst 0x01823e91 // stlexeq r3, r1, [r2] .inst 0x03330001 // teqeq r3, #1 .inst 0x0afffffa // beq 1b .inst 0xe2730000 // rsbs r0, r3, #0 - .inst 0xeaffffef // b <__kuser_memory_barrier> + .inst 0xe12fff1e // bx lr .align 5 __kuser_get_tls: // 0xffff0fe0 @@ -75,3 +75,42 @@ __kuser_helper_version: // 0xffff0ffc .word ((__kuser_helper_end - __kuser_helper_start) >> 5) .globl __kuser_helper_end __kuser_helper_end: + +/* + * AArch32 sigreturn code + * + * For ARM syscalls, the syscall number has to be loaded into r7. + * We do not support an OABI userspace. + * + * For Thumb syscalls, we also pass the syscall number via r7. We therefore + * need two 16-bit instructions. + */ + .globl __aarch32_sigret_code_start +__aarch32_sigret_code_start: + + /* + * ARM Code + */ + .byte __NR_compat_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, #__NR_compat_sigreturn + .byte __NR_compat_sigreturn, 0x00, 0x00, 0xef // svc #__NR_compat_sigreturn + + /* + * Thumb code + */ + .byte __NR_compat_sigreturn, 0x27 // svc #__NR_compat_sigreturn + .byte __NR_compat_sigreturn, 0xdf // mov r7, #__NR_compat_sigreturn + + /* + * ARM code + */ + .byte __NR_compat_rt_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, #__NR_compat_rt_sigreturn + .byte __NR_compat_rt_sigreturn, 0x00, 0x00, 0xef // svc #__NR_compat_rt_sigreturn + + /* + * Thumb code + */ + .byte __NR_compat_rt_sigreturn, 0x27 // svc #__NR_compat_rt_sigreturn + .byte __NR_compat_rt_sigreturn, 0xdf // mov r7, #__NR_compat_rt_sigreturn + + .globl __aarch32_sigret_code_end +__aarch32_sigret_code_end: |