*/
#include <stdlib.h>
+#include <string.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 <linux/ptrace.h>
#include <sys/mman.h>
#include <sys/user.h>
#include <asm/unistd.h>
#include "chan_user.h"
#include "signal_user.h"
#include "registers.h"
+#include "process.h"
int is_skas_winch(int pid, int fd, void *data)
{
- if(pid != os_getpid())
+ if(pid != os_getpgrp())
return(0);
register_winch_irq(-1, fd, -1, data);
return(1);
}
-static void handle_segv(int pid)
+void get_skas_faultinfo(int pid, struct faultinfo * fi)
{
- struct ptrace_faultinfo fault;
int err;
- err = ptrace(PTRACE_FAULTINFO, pid, 0, &fault);
+ err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
if(err)
- panic("handle_segv - PTRACE_FAULTINFO failed, errno = %d\n",
- errno);
+ panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, "
+ "errno = %d\n", errno);
+
+ /* Special handling for i386, which has different structs */
+ if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
+ memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
+ sizeof(struct faultinfo) -
+ sizeof(struct ptrace_faultinfo));
+}
- segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL);
+static void handle_segv(int pid, union uml_pt_regs * regs)
+{
+ get_skas_faultinfo(pid, ®s->skas.faultinfo);
+ segv(regs->skas.faultinfo, 0, 1, NULL);
}
/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
if (!local_using_sysemu)
{
- err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
+ err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
if(err < 0)
panic("handle_trap - nullifying syscall failed errno = %d\n",
errno);
int err, status, op, pid = userspace_pid[0];
int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
- restore_registers(pid, regs);
-
- local_using_sysemu = get_using_sysemu();
+ while(1){
+ restore_registers(pid, regs);
- op = local_using_sysemu ? PTRACE_SYSEMU : PTRACE_SYSCALL;
- err = ptrace(op, pid, 0, 0);
+ /* Now we set local_using_sysemu to be used for one loop */
+ local_using_sysemu = get_using_sysemu();
+
+ op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
+
+ err = ptrace(op, pid, 0, 0);
+ if(err)
+ panic("userspace - could not resume userspace process, "
+ "pid=%d, ptrace operation = %d, errno = %d\n",
+ op, errno);
- if(err)
- panic("userspace - PTRACE_%s failed, errno = %d\n",
- local_using_sysemu ? "SYSEMU" : "SYSCALL", errno);
- while(1){
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
- handle_segv(pid);
+ handle_segv(pid, regs);
break;
case SIGTRAP + 0x80:
handle_trap(pid, regs, local_using_sysemu);
case SIGBUS:
case SIGFPE:
case SIGWINCH:
- user_signal(WSTOPSIG(status), regs);
+ user_signal(WSTOPSIG(status), regs, pid);
break;
default:
printk("userspace - child stopped with signal "
/* Avoid -ERESTARTSYS handling in host */
PT_SYSCALL_NR(regs->skas.regs) = -1;
}
-
- restore_registers(pid, regs);
-
- /*Now we ended the syscall, so re-read local_using_sysemu.*/
- local_using_sysemu = get_using_sysemu();
-
- op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
-
- err = ptrace(op, pid, 0, 0);
- if(err)
- panic("userspace - PTRACE_%s failed, "
- "errno = %d\n",
- local_using_sysemu ? "SYSEMU" : "SYSCALL", errno);
}
}
+#define INIT_JMP_NEW_THREAD 0
+#define INIT_JMP_REMOVE_SIGSTACK 1
+#define INIT_JMP_CALLBACK 2
+#define INIT_JMP_HALT 3
+#define INIT_JMP_REBOOT 4
void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
void (*handler)(int))
*switch_buf = &buf;
fork_buf = fb;
if(sigsetjmp(buf, 1) == 0)
- siglongjmp(*fork_buf, 1);
+ siglongjmp(*fork_buf, INIT_JMP_REMOVE_SIGSTACK);
}
void switch_threads(void *me, void *next)
sigjmp_buf **switch_buf = switch_buf_ptr;
int n;
+ set_handler(SIGWINCH, (__sighandler_t) sig_handler,
+ SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
+ SIGVTALRM, -1);
+
*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){
+ switch(n){
+ case INIT_JMP_NEW_THREAD:
+ new_thread_proc((void *) stack, new_thread_handler);
+ break;
+ case INIT_JMP_REMOVE_SIGSTACK:
+ remove_sigstack();
+ break;
+ case INIT_JMP_CALLBACK:
(*cb_proc)(cb_arg);
siglongjmp(*cb_back, 1);
- }
- else if(n == 3){
+ break;
+ case INIT_JMP_HALT:
kmalloc_ok = 0;
return(0);
- }
- else if(n == 4){
+ case INIT_JMP_REBOOT:
kmalloc_ok = 0;
return(1);
+ default:
+ panic("Bad sigsetjmp return in start_idle_thread - %d\n", n);
}
siglongjmp(**switch_buf, 1);
}
block_signals();
if(sigsetjmp(here, 1) == 0)
- siglongjmp(initial_jmpbuf, 2);
+ siglongjmp(initial_jmpbuf, INIT_JMP_CALLBACK);
unblock_signals();
cb_proc = NULL;
void halt_skas(void)
{
block_signals();
- siglongjmp(initial_jmpbuf, 3);
+ siglongjmp(initial_jmpbuf, INIT_JMP_HALT);
}
void reboot_skas(void)
{
block_signals();
- siglongjmp(initial_jmpbuf, 4);
+ siglongjmp(initial_jmpbuf, INIT_JMP_REBOOT);
}
void switch_mm_skas(int mm_fd)
git://git.onelab.eu / linux-2.6.git / blobdiff