blob: 886862a432cbfdf640bef0d8f0751e673923b88e [file] [log] [blame]
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <setjmp.h>
#include <sched.h>
#include <sys/wait.h>
#include <sys/ptrace.h>
#include <sys/mman.h>
#include <sys/user.h>
#include <asm/unistd.h>
#include "user.h"
#include "ptrace_user.h"
#include "time_user.h"
#include "sysdep/ptrace.h"
#include "user_util.h"
#include "kern_util.h"
#include "skas.h"
#include "sysdep/sigcontext.h"
#include "os.h"
#include "proc_mm.h"
#include "skas_ptrace.h"
#include "chan_user.h"
int is_skas_winch(int pid, int fd, void *data)
{
if(pid != getpid())
return(0);
register_winch_irq(-1, fd, -1, data);
return(1);
}
/* These are set once at boot time and not changed thereafter */
unsigned long exec_regs[FRAME_SIZE];
unsigned long exec_fp_regs[HOST_FP_SIZE];
unsigned long exec_fpx_regs[HOST_XFP_SIZE];
int have_fpx_regs = 1;
static void handle_segv(int pid)
{
struct ptrace_faultinfo fault;
int err;
err = ptrace(PTRACE_FAULTINFO, pid, 0, &fault);
if(err)
panic("handle_segv - PTRACE_FAULTINFO failed, errno = %d\n",
errno);
segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL);
}
static void handle_trap(int pid, union uml_pt_regs *regs)
{
int err, syscall_nr, status;
syscall_nr = PT_SYSCALL_NR(regs->skas.regs);
UPT_SYSCALL_NR(regs) = syscall_nr;
if(syscall_nr < 1){
relay_signal(SIGTRAP, regs);
return;
}
err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
if(err < 0)
panic("handle_trap - nullifying syscall failed errno = %d\n",
errno);
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
if(err < 0)
panic("handle_trap - continuing to end of syscall failed, "
"errno = %d\n", errno);
err = waitpid(pid, &status, WUNTRACED);
if((err < 0) || !WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
panic("handle_trap - failed to wait at end of syscall, "
"errno = %d, status = %d\n", errno, status);
handle_syscall(regs);
}
static int userspace_tramp(void *arg)
{
init_new_thread_signals(0);
enable_timer();
ptrace(PTRACE_TRACEME, 0, 0, 0);
os_stop_process(os_getpid());
return(0);
}
/* Each element set once, and only accessed by a single processor anyway */
#define NR_CPUS 1
int userspace_pid[NR_CPUS];
void start_userspace(int cpu)
{
void *stack;
unsigned long sp;
int pid, status, n;
stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if(stack == MAP_FAILED)
panic("start_userspace : mmap failed, errno = %d", errno);
sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
pid = clone(userspace_tramp, (void *) sp,
CLONE_FILES | CLONE_VM | SIGCHLD, NULL);
if(pid < 0)
panic("start_userspace : clone failed, errno = %d", errno);
do {
n = waitpid(pid, &status, WUNTRACED);
if(n < 0)
panic("start_userspace : wait failed, errno = %d",
errno);
} while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
panic("start_userspace : expected SIGSTOP, got status = %d",
status);
if(munmap(stack, PAGE_SIZE) < 0)
panic("start_userspace : munmap failed, errno = %d\n", errno);
userspace_pid[cpu] = pid;
}
void userspace(union uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
restore_registers(regs);
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
if(err)
panic("userspace - PTRACE_SYSCALL failed, errno = %d\n",
errno);
while(1){
err = waitpid(pid, &status, WUNTRACED);
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
errno);
regs->skas.is_user = 1;
save_registers(regs);
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
handle_segv(pid);
break;
case SIGTRAP:
handle_trap(pid, regs);
break;
case SIGIO:
case SIGVTALRM:
case SIGILL:
case SIGBUS:
case SIGFPE:
case SIGWINCH:
user_signal(WSTOPSIG(status), regs);
break;
default:
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
interrupt_end();
}
restore_registers(regs);
op = singlestepping_skas() ? PTRACE_SINGLESTEP :
PTRACE_SYSCALL;
err = ptrace(op, pid, 0, 0);
if(err)
panic("userspace - PTRACE_SYSCALL failed, "
"errno = %d\n", errno);
}
}
void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
void (*handler)(int))
{
jmp_buf switch_buf, fork_buf;
*switch_buf_ptr = &switch_buf;
*fork_buf_ptr = &fork_buf;
if(sigsetjmp(fork_buf, 1) == 0)
new_thread_proc(stack, handler);
remove_sigstack();
}
void thread_wait(void *sw, void *fb)
{
jmp_buf buf, **switch_buf = sw, *fork_buf;
*switch_buf = &buf;
fork_buf = fb;
if(sigsetjmp(buf, 1) == 0)
siglongjmp(*fork_buf, 1);
}
static int move_registers(int pid, int int_op, int fp_op,
union uml_pt_regs *regs, unsigned long *fp_regs)
{
if(ptrace(int_op, pid, 0, regs->skas.regs) < 0)
return(-errno);
if(ptrace(fp_op, pid, 0, fp_regs) < 0)
return(-errno);
return(0);
}
void save_registers(union uml_pt_regs *regs)
{
unsigned long *fp_regs;
int err, fp_op;
if(have_fpx_regs){
fp_op = PTRACE_GETFPXREGS;
fp_regs = regs->skas.xfp;
}
else {
fp_op = PTRACE_GETFPREGS;
fp_regs = regs->skas.fp;
}
err = move_registers(userspace_pid[0], PTRACE_GETREGS, fp_op, regs,
fp_regs);
if(err)
panic("save_registers - saving registers failed, errno = %d\n",
-err);
}
void restore_registers(union uml_pt_regs *regs)
{
unsigned long *fp_regs;
int err, fp_op;
if(have_fpx_regs){
fp_op = PTRACE_SETFPXREGS;
fp_regs = regs->skas.xfp;
}
else {
fp_op = PTRACE_SETFPREGS;
fp_regs = regs->skas.fp;
}
err = move_registers(userspace_pid[0], PTRACE_SETREGS, fp_op, regs,
fp_regs);
if(err)
panic("restore_registers - saving registers failed, "
"errno = %d\n", -err);
}
void switch_threads(void *me, void *next)
{
jmp_buf my_buf, **me_ptr = me, *next_buf = next;
*me_ptr = &my_buf;
if(sigsetjmp(my_buf, 1) == 0)
siglongjmp(*next_buf, 1);
}
static jmp_buf initial_jmpbuf;
/* XXX Make these percpu */
static void (*cb_proc)(void *arg);
static void *cb_arg;
static jmp_buf *cb_back;
int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
{
jmp_buf **switch_buf = switch_buf_ptr;
int n;
*fork_buf_ptr = &initial_jmpbuf;
n = sigsetjmp(initial_jmpbuf, 1);
if(n == 0)
new_thread_proc((void *) stack, new_thread_handler);
else if(n == 1)
remove_sigstack();
else if(n == 2){
(*cb_proc)(cb_arg);
siglongjmp(*cb_back, 1);
}
else if(n == 3){
kmalloc_ok = 0;
return(0);
}
else if(n == 4){
kmalloc_ok = 0;
return(1);
}
siglongjmp(**switch_buf, 1);
}
void remove_sigstack(void)
{
stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
.ss_sp = NULL,
.ss_size = 0 });
if(sigaltstack(&stack, NULL) != 0)
panic("disabling signal stack failed, errno = %d\n", errno);
}
void initial_thread_cb_skas(void (*proc)(void *), void *arg)
{
jmp_buf here;
cb_proc = proc;
cb_arg = arg;
cb_back = &here;
block_signals();
if(sigsetjmp(here, 1) == 0)
siglongjmp(initial_jmpbuf, 2);
unblock_signals();
cb_proc = NULL;
cb_arg = NULL;
cb_back = NULL;
}
void halt_skas(void)
{
block_signals();
siglongjmp(initial_jmpbuf, 3);
}
void reboot_skas(void)
{
block_signals();
siglongjmp(initial_jmpbuf, 4);
}
int new_mm(int from)
{
struct proc_mm_op copy;
int n, fd = os_open_file("/proc/mm",
of_cloexec(of_write(OPENFLAGS())), 0);
if(fd < 0)
return(fd);
if(from != -1){
copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
.u =
{ .copy_segments = from } } );
n = os_write_file(fd, &copy, sizeof(copy));
if(n != sizeof(copy))
printk("new_mm : /proc/mm copy_segments failed, "
"err = %d\n", -n);
}
return(fd);
}
void switch_mm_skas(int mm_fd)
{
int err;
#warning need cpu pid in switch_mm_skas
err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, mm_fd);
if(err)
panic("switch_mm_skas - PTRACE_SWITCH_MM failed, errno = %d\n",
errno);
}
void kill_off_processes_skas(void)
{
#warning need to loop over userspace_pids in kill_off_processes_skas
os_kill_process(userspace_pid[0], 1);
}
void init_registers(int pid)
{
int err;
if(ptrace(PTRACE_GETREGS, pid, 0, exec_regs) < 0)
panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
errno);
err = ptrace(PTRACE_GETFPXREGS, pid, 0, exec_fpx_regs);
if(!err)
return;
have_fpx_regs = 0;
if(errno != EIO)
panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
errno);
err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs);
if(err)
panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d",
errno);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/