projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 4bff8cb5 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| c2272b2d | 2 | #include <linux/linkage.h> |
| 4bff8cb5 SS |
3 | #include <asm/vdso.h> |
| 4 | #include <asm/unistd.h> | |
| 5 | #include <asm/asm-offsets.h> | |
| 6 | #include <asm/dwarf.h> | |
| 7 | #include <asm/ptrace.h> | |
| 8 | ||
| 4bff8cb5 SS |
9 | /* |
| 10 | * Older glibc version called vdso without allocating a stackframe. This wrapper | |
| 11 | * is just used to allocate a stackframe. See | |
| 12 | * https://sourceware.org/git/?p=glibc.git;a=commit;h=478593e6374f3818da39332260dc453cb19cfa1e | |
| 13 | * for details. | |
| 14 | */ | |
| 15 | .macro vdso_func func | |
| 16 | .globl __kernel_\func | |
| 17 | .type __kernel_\func,@function | |
| c2272b2d | 18 | __ALIGN |
| 4bff8cb5 SS |
19 | __kernel_\func: |
| 20 | CFI_STARTPROC | |
| be72ea09 HC |
21 | aghi %r15,-STACK_FRAME_VDSO_OVERHEAD |
| 22 | CFI_DEF_CFA_OFFSET (STACK_FRAME_USER_OVERHEAD + STACK_FRAME_VDSO_OVERHEAD) | |
| 23 | CFI_VAL_OFFSET 15,-STACK_FRAME_USER_OVERHEAD | |
| 24 | stg %r14,__SFVDSO_RETURN_ADDRESS(%r15) | |
| 25 | CFI_REL_OFFSET 14,__SFVDSO_RETURN_ADDRESS | |
| 62b672c4 | 26 | xc __SFUSER_BACKCHAIN(8,%r15),__SFUSER_BACKCHAIN(%r15) |
| 4bff8cb5 | 27 | brasl %r14,__s390_vdso_\func |
| be72ea09 | 28 | lg %r14,__SFVDSO_RETURN_ADDRESS(%r15) |
| b961ec10 | 29 | CFI_RESTORE 14 |
| be72ea09 HC |
30 | aghi %r15,STACK_FRAME_VDSO_OVERHEAD |
| 31 | CFI_DEF_CFA_OFFSET STACK_FRAME_USER_OVERHEAD | |
| 4bff8cb5 SS |
32 | CFI_RESTORE 15 |
| 33 | br %r14 | |
| 34 | CFI_ENDPROC | |
| 35 | .size __kernel_\func,.-__kernel_\func | |
| 36 | .endm | |
| 37 | ||
| 38 | vdso_func gettimeofday | |
| 39 | vdso_func clock_getres | |
| 40 | vdso_func clock_gettime | |
| 80f06306 | 41 | vdso_func getcpu |
| 686341f2 SS |
42 | |
| 43 | .macro vdso_syscall func,syscall | |
| 44 | .globl __kernel_\func | |
| 45 | .type __kernel_\func,@function | |
| c2272b2d | 46 | __ALIGN |
| 686341f2 SS |
47 | __kernel_\func: |
| 48 | CFI_STARTPROC | |
| 49 | svc \syscall | |
| 50 | /* Make sure we notice when a syscall returns, which shouldn't happen */ | |
| 51 | .word 0 | |
| 52 | CFI_ENDPROC | |
| 53 | .size __kernel_\func,.-__kernel_\func | |
| 54 | .endm | |
| 55 | ||
| 56 | vdso_syscall restart_syscall,__NR_restart_syscall | |
| 57 | vdso_syscall sigreturn,__NR_sigreturn | |
| 58 | vdso_syscall rt_sigreturn,__NR_rt_sigreturn |