125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
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/*
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* Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#ifndef __SYSDEP_STUB_H
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#define __SYSDEP_STUB_H
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#include <sysdep/ptrace_user.h>
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#include <generated/asm-offsets.h>
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#include <linux/stddef.h>
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#define STUB_MMAP_NR __NR_mmap
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#define MMAP_OFFSET(o) (o)
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#define __syscall_clobber "r11","rcx","memory"
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#define __syscall "syscall"
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static inline long stub_syscall0(long syscall)
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{
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long ret;
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__asm__ volatile (__syscall
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: "=a" (ret)
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: "0" (syscall) : __syscall_clobber );
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return ret;
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}
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static inline long stub_syscall2(long syscall, long arg1, long arg2)
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{
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long ret;
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__asm__ volatile (__syscall
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: "=a" (ret)
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: "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
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return ret;
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}
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static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
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{
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long ret;
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__asm__ volatile (__syscall
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: "=a" (ret)
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: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
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: __syscall_clobber );
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return ret;
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}
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static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
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long arg4)
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{
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long ret;
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__asm__ volatile ("movq %5,%%r10 ; " __syscall
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: "=a" (ret)
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: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
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"g" (arg4)
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: __syscall_clobber, "r10" );
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return ret;
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}
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static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
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long arg4, long arg5)
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{
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long ret;
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__asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
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: "=a" (ret)
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: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
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"g" (arg4), "g" (arg5)
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: __syscall_clobber, "r10", "r8" );
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return ret;
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}
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static inline void trap_myself(void)
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{
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__asm("int3");
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}
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static inline void remap_stack_and_trap(void)
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{
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__asm__ volatile (
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"movq %0,%%rax ;"
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"movq %%rsp,%%rdi ;"
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"andq %1,%%rdi ;"
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"movq %2,%%r10 ;"
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"movq %%rdi,%%r8 ; addq %3,%%r8 ; movq (%%r8),%%r8 ;"
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"movq %%rdi,%%r9 ; addq %4,%%r9 ; movq (%%r9),%%r9 ;"
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__syscall ";"
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"movq %%rsp,%%rdi ; andq %1,%%rdi ;"
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"addq %5,%%rdi ; movq %%rax, (%%rdi) ;"
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"int3"
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: :
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"g" (STUB_MMAP_NR),
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"g" (~(UM_KERN_PAGE_SIZE - 1)),
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"g" (MAP_FIXED | MAP_SHARED),
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"g" (UML_STUB_FIELD_FD),
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"g" (UML_STUB_FIELD_OFFSET),
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"g" (UML_STUB_FIELD_CHILD_ERR),
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"S" (UM_KERN_PAGE_SIZE),
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"d" (PROT_READ | PROT_WRITE)
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:
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__syscall_clobber, "r10", "r8", "r9");
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}
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static __always_inline void *get_stub_page(void)
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{
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unsigned long ret;
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asm volatile (
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"movq %%rsp,%0 ;"
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"andq %1,%0"
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: "=a" (ret)
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: "g" (~(UM_KERN_PAGE_SIZE - 1)));
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return (void *)ret;
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}
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#endif
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