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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 <stddef.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 __always_inline long stub_syscall0(long syscall)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)
: "memory");
return ret;
}
static __always_inline long stub_syscall1(long syscall, long arg1)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)
: "memory");
return ret;
}
static __always_inline long stub_syscall2(long syscall, long arg1, long arg2)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2)
: "memory");
return ret;
}
static __always_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)
: "memory");
return ret;
}
static __always_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)
: "memory");
return ret;
}
static __always_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)
: "memory");
return ret;
}
static __always_inline long stub_syscall6(long syscall, long arg1, long arg2,
long arg3, long arg4, long arg5,
long arg6)
{
struct syscall_args {
int ebx, ebp;
} args = { arg1, arg6 };
long ret;
__asm__ volatile ("pushl %%ebp;"
"movl 0x4(%%ebx),%%ebp;"
"movl (%%ebx),%%ebx;"
"int $0x80;"
"popl %%ebp"
: "=a" (ret)
: "0" (syscall), "b" (&args),
"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
: "memory");
return ret;
}
static __always_inline void trap_myself(void)
{
__asm("int3");
}
static __always_inline void *get_stub_data(void)
{
unsigned long ret;
asm volatile (
"call _here_%=;"
"_here_%=:"
"popl %0;"
"andl %1, %0 ;"
"addl %2, %0 ;"
: "=a" (ret)
: "g" (~(UM_KERN_PAGE_SIZE - 1)),
"g" (UM_KERN_PAGE_SIZE));
return (void *)ret;
}
#define stub_start(fn) \
asm volatile ( \
"subl %0,%%esp ;" \
"movl %1, %%eax ; " \
"call *%%eax ;" \
:: "i" ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE), \
"i" (&fn))
static __always_inline void
stub_seccomp_restore_state(struct stub_data_arch *arch)
{
for (int i = 0; i < sizeof(arch->tls) / sizeof(arch->tls[0]); i++) {
if (arch->sync & (1 << i))
stub_syscall1(__NR_set_thread_area,
(unsigned long) &arch->tls[i]);
}
arch->sync = 0;
}
#endif
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