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/*
* Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_STUB_H
#define __SYSDEP_STUB_H
#include <asm/ptrace.h>
#include <generated/asm-offsets.h>
#define STUB_MMAP_NR __NR_mmap2
#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
static inline long stub_syscall0(long syscall)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
return ret;
}
static inline long stub_syscall1(long syscall, long arg1)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
return ret;
}
static inline long stub_syscall2(long syscall, long arg1, long arg2)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2));
return ret;
}
static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2), "d" (arg3));
return ret;
}
static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
long arg4)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2), "d" (arg3), "S" (arg4));
return ret;
}
static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
long arg4, long arg5)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
return ret;
}
static inline void trap_myself(void)
{
__asm("int3");
}
static inline void remap_stack_and_trap(void)
{
__asm__ volatile (
"movl %%esp,%%ebx ;"
"andl %0,%%ebx ;"
"movl %1,%%eax ;"
"movl %%ebx,%%edi ; addl %2,%%edi ; movl (%%edi),%%edi ;"
"movl %%ebx,%%ebp ; addl %3,%%ebp ; movl (%%ebp),%%ebp ;"
"int $0x80 ;"
"addl %4,%%ebx ; movl %%eax, (%%ebx) ;"
"int $3"
: :
"g" (~(UM_KERN_PAGE_SIZE - 1)),
"g" (STUB_MMAP_NR),
"g" (UML_STUB_FIELD_FD),
"g" (UML_STUB_FIELD_OFFSET),
"g" (UML_STUB_FIELD_CHILD_ERR),
"c" (UM_KERN_PAGE_SIZE),
"d" (PROT_READ | PROT_WRITE),
"S" (MAP_FIXED | MAP_SHARED)
:
"memory");
}
static __always_inline void *get_stub_page(void)
{
unsigned long ret;
asm volatile (
"movl %%esp,%0 ;"
"andl %1,%0"
: "=a" (ret)
: "g" (~(UM_KERN_PAGE_SIZE - 1)));
return (void *)ret;
}
#endif
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