diff options
Diffstat (limited to 'arch/x86/um/shared/sysdep/stub_64.h')
-rw-r--r-- | arch/x86/um/shared/sysdep/stub_64.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/x86/um/shared/sysdep/stub_64.h b/arch/x86/um/shared/sysdep/stub_64.h new file mode 100644 index 0000000000..2de1c8f881 --- /dev/null +++ b/arch/x86/um/shared/sysdep/stub_64.h @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#ifndef __SYSDEP_STUB_H +#define __SYSDEP_STUB_H + +#include <sysdep/ptrace_user.h> +#include <generated/asm-offsets.h> +#include <linux/stddef.h> + +#define STUB_MMAP_NR __NR_mmap +#define MMAP_OFFSET(o) (o) + +#define __syscall_clobber "r11","rcx","memory" +#define __syscall "syscall" + +static inline long stub_syscall0(long syscall) +{ + long ret; + + __asm__ volatile (__syscall + : "=a" (ret) + : "0" (syscall) : __syscall_clobber ); + + return ret; +} + +static inline long stub_syscall2(long syscall, long arg1, long arg2) +{ + long ret; + + __asm__ volatile (__syscall + : "=a" (ret) + : "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber ); + + return ret; +} + +static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3) +{ + long ret; + + __asm__ volatile (__syscall + : "=a" (ret) + : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3) + : __syscall_clobber ); + + return ret; +} + +static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3, + long arg4) +{ + long ret; + + __asm__ volatile ("movq %5,%%r10 ; " __syscall + : "=a" (ret) + : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3), + "g" (arg4) + : __syscall_clobber, "r10" ); + + return ret; +} + +static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3, + long arg4, long arg5) +{ + long ret; + + __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall + : "=a" (ret) + : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3), + "g" (arg4), "g" (arg5) + : __syscall_clobber, "r10", "r8" ); + + return ret; +} + +static inline void trap_myself(void) +{ + __asm("int3"); +} + +static inline void remap_stack_and_trap(void) +{ + __asm__ volatile ( + "movq %0,%%rax ;" + "movq %%rsp,%%rdi ;" + "andq %1,%%rdi ;" + "movq %2,%%r10 ;" + "movq %%rdi,%%r8 ; addq %3,%%r8 ; movq (%%r8),%%r8 ;" + "movq %%rdi,%%r9 ; addq %4,%%r9 ; movq (%%r9),%%r9 ;" + __syscall ";" + "movq %%rsp,%%rdi ; andq %1,%%rdi ;" + "addq %5,%%rdi ; movq %%rax, (%%rdi) ;" + "int3" + : : + "g" (STUB_MMAP_NR), + "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)), + "g" (MAP_FIXED | MAP_SHARED), + "g" (UML_STUB_FIELD_FD), + "g" (UML_STUB_FIELD_OFFSET), + "g" (UML_STUB_FIELD_CHILD_ERR), + "S" (STUB_DATA_PAGES * UM_KERN_PAGE_SIZE), + "d" (PROT_READ | PROT_WRITE) + : + __syscall_clobber, "r10", "r8", "r9"); +} + +static __always_inline void *get_stub_data(void) +{ + unsigned long ret; + + asm volatile ( + "movq %%rsp,%0 ;" + "andq %1,%0" + : "=a" (ret) + : "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1))); + + return (void *)ret; +} +#endif |