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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <signal.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <asm/page.h>
#include <asm/unistd.h>
#include "mem_user.h"
#include "mem.h"
#include "mm_id.h"
#include "user.h"
#include "os.h"
#include "proc_mm.h"
#include "ptrace_user.h"
#include "user_util.h"
#include "kern_util.h"
#include "task.h"
#include "registers.h"
#include "uml-config.h"
#include "sysdep/ptrace.h"
#include "sysdep/stub.h"
#include "skas.h"
extern unsigned long syscall_stub, batch_syscall_stub, __syscall_stub_start;
extern void wait_stub_done(int pid, int sig, char * fname);
int single_count = 0;
static long one_syscall_stub(struct mm_id * mm_idp, int syscall,
unsigned long *args)
{
int n, pid = mm_idp->u.pid;
unsigned long regs[MAX_REG_NR];
get_safe_registers(regs);
regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
((unsigned long) &syscall_stub -
(unsigned long) &__syscall_stub_start);
/* XXX Don't have a define for starting a syscall */
regs[REGS_SYSCALL_NR] = syscall;
regs[REGS_SYSCALL_ARG1] = args[0];
regs[REGS_SYSCALL_ARG2] = args[1];
regs[REGS_SYSCALL_ARG3] = args[2];
regs[REGS_SYSCALL_ARG4] = args[3];
regs[REGS_SYSCALL_ARG5] = args[4];
regs[REGS_SYSCALL_ARG6] = args[5];
n = ptrace_setregs(pid, regs);
if(n < 0){
printk("one_syscall_stub : PTRACE_SETREGS failed, "
"errno = %d\n", n);
return(n);
}
wait_stub_done(pid, 0, "one_syscall_stub");
return(*((unsigned long *) mm_idp->stack));
}
int multi_count = 0;
int multi_op_count = 0;
static long many_syscall_stub(struct mm_id * mm_idp, int syscall,
unsigned long *args, int done, void **addr_out)
{
unsigned long regs[MAX_REG_NR], *stack;
int n, pid = mm_idp->u.pid;
stack = *addr_out;
if(stack == NULL)
stack = (unsigned long *) current_stub_stack();
*stack++ = syscall;
*stack++ = args[0];
*stack++ = args[1];
*stack++ = args[2];
*stack++ = args[3];
*stack++ = args[4];
*stack++ = args[5];
*stack = 0;
multi_op_count++;
if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
PAGE_SIZE - 8 * sizeof(long))){
*addr_out = stack;
return 0;
}
multi_count++;
get_safe_registers(regs);
regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
((unsigned long) &batch_syscall_stub -
(unsigned long) &__syscall_stub_start);
regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA;
n = ptrace_setregs(pid, regs);
if(n < 0){
printk("many_syscall_stub : PTRACE_SETREGS failed, "
"errno = %d\n", n);
return(n);
}
wait_stub_done(pid, 0, "many_syscall_stub");
stack = (unsigned long *) mm_idp->stack;
*addr_out = stack;
return(*stack);
}
static long run_syscall_stub(struct mm_id * mm_idp, int syscall,
unsigned long *args, void **addr, int done)
{
long res;
if((*addr == NULL) && done)
res = one_syscall_stub(mm_idp, syscall, args);
else res = many_syscall_stub(mm_idp, syscall, args, done, addr);
return res;
}
void *map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,
int r, int w, int x, int phys_fd, unsigned long long offset,
int done, void *data)
{
int prot, n;
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0);
if(proc_mm){
struct proc_mm_op map;
int fd = mm_idp->u.mm_fd;
map = ((struct proc_mm_op) { .op = MM_MMAP,
.u =
{ .mmap =
{ .addr = virt,
.len = len,
.prot = prot,
.flags = MAP_SHARED |
MAP_FIXED,
.fd = phys_fd,
.offset= offset
} } } );
n = os_write_file(fd, &map, sizeof(map));
if(n != sizeof(map))
printk("map : /proc/mm map failed, err = %d\n", -n);
}
else {
long res;
unsigned long args[] = { virt, len, prot,
MAP_SHARED | MAP_FIXED, phys_fd,
MMAP_OFFSET(offset) };
res = run_syscall_stub(mm_idp, STUB_MMAP_NR, args,
&data, done);
if((void *) res == MAP_FAILED)
printk("mmap stub failed, errno = %d\n", res);
}
return data;
}
void *unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done,
void *data)
{
int n;
if(proc_mm){
struct proc_mm_op unmap;
int fd = mm_idp->u.mm_fd;
unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
.u =
{ .munmap =
{ .addr =
(unsigned long) addr,
.len = len } } } );
n = os_write_file(fd, &unmap, sizeof(unmap));
if(n != sizeof(unmap))
printk("unmap - proc_mm write returned %d\n", n);
}
else {
int res;
unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
0 };
res = run_syscall_stub(mm_idp, __NR_munmap, args,
&data, done);
if(res < 0)
printk("munmap stub failed, errno = %d\n", res);
}
return data;
}
void *protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
int r, int w, int x, int done, void *data)
{
struct proc_mm_op protect;
int prot, n;
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0);
if(proc_mm){
int fd = mm_idp->u.mm_fd;
protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
.u =
{ .mprotect =
{ .addr =
(unsigned long) addr,
.len = len,
.prot = prot } } } );
n = os_write_file(fd, &protect, sizeof(protect));
if(n != sizeof(protect))
panic("protect failed, err = %d", -n);
}
else {
int res;
unsigned long args[] = { addr, len, prot, 0, 0, 0 };
res = run_syscall_stub(mm_idp, __NR_mprotect, args,
&data, done);
if(res < 0)
panic("mprotect stub failed, errno = %d\n", res);
}
return data;
}
void before_mem_skas(unsigned long unused)
{
}
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