102 lines
2.1 KiB
C
102 lines
2.1 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 <sys/mman.h>
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#include <asm/ptrace.h>
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#include <asm/unistd.h>
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#include "stub-data.h"
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#include "kern_constants.h"
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#include "uml-config.h"
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extern void stub_segv_handler(int sig);
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extern void stub_clone_handler(void);
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#define STUB_SYSCALL_RET EAX
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#define STUB_MMAP_NR __NR_mmap2
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#define MMAP_OFFSET(o) ((o) >> 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(int fd, unsigned long offset)
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{
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__asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
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"movl %7, %%ebx ; movl %%eax, (%%ebx)"
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: : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA),
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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), "D" (fd),
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"a" (offset),
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"i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err)
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: "memory");
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}
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#endif
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