117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
/*
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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 <asm/ptrace.h>
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#include <generated/asm-offsets.h>
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#define STUB_MMAP_NR __NR_mmap2
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#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
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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 ("int $0x80" : "=a" (ret) : "0" (syscall));
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return ret;
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}
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static inline long stub_syscall1(long syscall, long arg1)
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{
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long ret;
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__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
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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 ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
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"c" (arg2));
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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 ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
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"c" (arg2), "d" (arg3));
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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 ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
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"c" (arg2), "d" (arg3), "S" (arg4));
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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 ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
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"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
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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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"movl %%esp,%%ebx ;"
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"andl %0,%%ebx ;"
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"movl %1,%%eax ;"
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"movl %%ebx,%%edi ; addl %2,%%edi ; movl (%%edi),%%edi ;"
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"movl %%ebx,%%ebp ; addl %3,%%ebp ; movl (%%ebp),%%ebp ;"
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"int $0x80 ;"
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"addl %4,%%ebx ; movl %%eax, (%%ebx) ;"
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"int $3"
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: :
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"g" (~(UM_KERN_PAGE_SIZE - 1)),
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"g" (STUB_MMAP_NR),
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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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"c" (UM_KERN_PAGE_SIZE),
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"d" (PROT_READ | PROT_WRITE),
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"S" (MAP_FIXED | MAP_SHARED)
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:
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"memory");
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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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"movl %%esp,%0 ;"
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"andl %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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