forked from luck/tmp_suning_uos_patched
[PATCH] uml: move libc-dependent skas process handling
The serial UML OS-abstraction layer patch (um/kernel/skas dir). This moves all systemcalls from skas/process.c file under os-Linux dir and join skas/process.c and skas/process_kern.c files. Signed-off-by: Gennady Sharapov <gennady.v.sharapov@intel.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Gennady Sharapov
Linus Torvalds
parent
f45d9fc9d8
commit
abaf69773d
@ -232,6 +232,7 @@ extern void block_signals(void);
|
||||
extern void unblock_signals(void);
|
||||
extern int get_signals(void);
|
||||
extern int set_signals(int enable);
|
||||
extern void os_usr1_signal(int on);
|
||||
|
||||
/* trap.c */
|
||||
extern void os_fill_handlinfo(struct kern_handlers h);
|
||||
@ -272,4 +273,22 @@ extern int protect(struct mm_id * mm_idp, unsigned long addr,
|
||||
unsigned long len, int r, int w, int x, int done,
|
||||
void **data);
|
||||
|
||||
/* skas/process.c */
|
||||
extern int is_skas_winch(int pid, int fd, void *data);
|
||||
extern int start_userspace(unsigned long stub_stack);
|
||||
extern int copy_context_skas0(unsigned long stack, int pid);
|
||||
extern void userspace(union uml_pt_regs *regs);
|
||||
extern void map_stub_pages(int fd, unsigned long code,
|
||||
unsigned long data, unsigned long stack);
|
||||
extern void new_thread(void *stack, void **switch_buf_ptr,
|
||||
void **fork_buf_ptr, void (*handler)(int));
|
||||
extern void thread_wait(void *sw, void *fb);
|
||||
extern void switch_threads(void *me, void *next);
|
||||
extern int start_idle_thread(void *stack, void *switch_buf_ptr,
|
||||
void **fork_buf_ptr);
|
||||
extern void initial_thread_cb_skas(void (*proc)(void *),
|
||||
void *arg);
|
||||
extern void halt_skas(void);
|
||||
extern void reboot_skas(void);
|
||||
|
||||
#endif
|
||||
|
||||
@ -14,9 +14,6 @@ extern unsigned long exec_fpx_regs[];
|
||||
extern int have_fpx_regs;
|
||||
|
||||
extern void sig_handler_common_skas(int sig, void *sc_ptr);
|
||||
extern void halt_skas(void);
|
||||
extern void reboot_skas(void);
|
||||
extern void kill_off_processes_skas(void);
|
||||
extern int is_skas_winch(int pid, int fd, void *data);
|
||||
|
||||
#endif
|
||||
|
||||
@ -18,7 +18,6 @@ extern int copy_thread_skas(int nr, unsigned long clone_flags,
|
||||
unsigned long sp, unsigned long stack_top,
|
||||
struct task_struct *p, struct pt_regs *regs);
|
||||
extern void release_thread_skas(struct task_struct *task);
|
||||
extern void initial_thread_cb_skas(void (*proc)(void *), void *arg);
|
||||
extern void init_idle_skas(void);
|
||||
extern void flush_tlb_kernel_range_skas(unsigned long start,
|
||||
unsigned long end);
|
||||
|
||||
@ -13,21 +13,12 @@ extern int userspace_pid[];
|
||||
extern int proc_mm, ptrace_faultinfo, ptrace_ldt;
|
||||
extern int skas_needs_stub;
|
||||
|
||||
extern void switch_threads(void *me, void *next);
|
||||
extern void thread_wait(void *sw, void *fb);
|
||||
extern void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
|
||||
void (*handler)(int));
|
||||
extern int start_idle_thread(void *stack, void *switch_buf_ptr,
|
||||
void **fork_buf_ptr);
|
||||
extern int user_thread(unsigned long stack, int flags);
|
||||
extern void userspace(union uml_pt_regs *regs);
|
||||
extern void new_thread_proc(void *stack, void (*handler)(int sig));
|
||||
extern void new_thread_handler(int sig);
|
||||
extern void handle_syscall(union uml_pt_regs *regs);
|
||||
extern void user_signal(int sig, union uml_pt_regs *regs, int pid);
|
||||
extern int new_mm(unsigned long stack);
|
||||
extern int start_userspace(unsigned long stub_stack);
|
||||
extern int copy_context_skas0(unsigned long stack, int pid);
|
||||
extern void get_skas_faultinfo(int pid, struct faultinfo * fi);
|
||||
extern long execute_syscall_skas(void *r);
|
||||
extern unsigned long current_stub_stack(void);
|
||||
|
||||
@ -3,10 +3,10 @@
|
||||
# Licensed under the GPL
|
||||
#
|
||||
|
||||
obj-y := clone.o exec_kern.o mem.o mmu.o process.o process_kern.o \
|
||||
obj-y := clone.o exec_kern.o mem.o mmu.o process_kern.o \
|
||||
syscall.o tlb.o uaccess.o
|
||||
|
||||
USER_OBJS := process.o clone.o
|
||||
USER_OBJS := clone.o
|
||||
|
||||
include arch/um/scripts/Makefile.rules
|
||||
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
/*
|
||||
/*
|
||||
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
|
||||
* Licensed under the GPL
|
||||
*/
|
||||
@ -32,7 +32,7 @@ void switch_to_skas(void *prev, void *next)
|
||||
if(current->pid == 0)
|
||||
switch_timers(0);
|
||||
|
||||
switch_threads(&from->thread.mode.skas.switch_buf,
|
||||
switch_threads(&from->thread.mode.skas.switch_buf,
|
||||
to->thread.mode.skas.switch_buf);
|
||||
|
||||
if(current->pid == 0)
|
||||
@ -48,8 +48,8 @@ void new_thread_handler(int sig)
|
||||
|
||||
fn = current->thread.request.u.thread.proc;
|
||||
arg = current->thread.request.u.thread.arg;
|
||||
change_sig(SIGUSR1, 1);
|
||||
thread_wait(¤t->thread.mode.skas.switch_buf,
|
||||
os_usr1_signal(1);
|
||||
thread_wait(¤t->thread.mode.skas.switch_buf,
|
||||
current->thread.mode.skas.fork_buf);
|
||||
|
||||
if(current->thread.prev_sched != NULL)
|
||||
@ -80,8 +80,8 @@ void release_thread_skas(struct task_struct *task)
|
||||
|
||||
void fork_handler(int sig)
|
||||
{
|
||||
change_sig(SIGUSR1, 1);
|
||||
thread_wait(¤t->thread.mode.skas.switch_buf,
|
||||
os_usr1_signal(1);
|
||||
thread_wait(¤t->thread.mode.skas.switch_buf,
|
||||
current->thread.mode.skas.fork_buf);
|
||||
|
||||
force_flush_all();
|
||||
@ -91,13 +91,13 @@ void fork_handler(int sig)
|
||||
schedule_tail(current->thread.prev_sched);
|
||||
current->thread.prev_sched = NULL;
|
||||
|
||||
/* Handle any immediate reschedules or signals */
|
||||
/* Handle any immediate reschedules or signals */
|
||||
interrupt_end();
|
||||
userspace(¤t->thread.regs.regs);
|
||||
}
|
||||
|
||||
int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
|
||||
unsigned long stack_top, struct task_struct * p,
|
||||
unsigned long stack_top, struct task_struct * p,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
void (*handler)(int);
|
||||
@ -121,8 +121,6 @@ int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
|
||||
return(0);
|
||||
}
|
||||
|
||||
extern void map_stub_pages(int fd, unsigned long code,
|
||||
unsigned long data, unsigned long stack);
|
||||
int new_mm(unsigned long stack)
|
||||
{
|
||||
int fd;
|
||||
|
||||
@ -194,3 +194,8 @@ int set_signals(int enable)
|
||||
|
||||
return(ret);
|
||||
}
|
||||
|
||||
void os_usr1_signal(int on)
|
||||
{
|
||||
change_sig(SIGUSR1, on);
|
||||
}
|
||||
|
||||
@ -3,8 +3,8 @@
|
||||
# Licensed under the GPL
|
||||
#
|
||||
|
||||
obj-y := mem.o trap.o
|
||||
obj-y := mem.o process.o trap.o
|
||||
|
||||
USER_OBJS := mem.o trap.o
|
||||
USER_OBJS := mem.o process.o trap.o
|
||||
|
||||
include arch/um/scripts/Makefile.rules
|
||||
|
||||
565
arch/um/os-Linux/skas/process.c
Normal file
565
arch/um/os-Linux/skas/process.c
Normal file
@ -0,0 +1,565 @@
|
||||
/*
|
||||
* Copyright (C) 2002- 2004 Jeff Dike (jdike@addtoit.com)
|
||||
* Licensed under the GPL
|
||||
*/
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <errno.h>
|
||||
#include <signal.h>
|
||||
#include <setjmp.h>
|
||||
#include <sched.h>
|
||||
#include "ptrace_user.h"
|
||||
#include <sys/wait.h>
|
||||
#include <sys/mman.h>
|
||||
#include <sys/user.h>
|
||||
#include <sys/time.h>
|
||||
#include <asm/unistd.h>
|
||||
#include <asm/types.h>
|
||||
#include "user.h"
|
||||
#include "sysdep/ptrace.h"
|
||||
#include "user_util.h"
|
||||
#include "kern_util.h"
|
||||
#include "skas.h"
|
||||
#include "stub-data.h"
|
||||
#include "mm_id.h"
|
||||
#include "sysdep/sigcontext.h"
|
||||
#include "sysdep/stub.h"
|
||||
#include "os.h"
|
||||
#include "proc_mm.h"
|
||||
#include "skas_ptrace.h"
|
||||
#include "chan_user.h"
|
||||
#include "registers.h"
|
||||
#include "mem.h"
|
||||
#include "uml-config.h"
|
||||
#include "process.h"
|
||||
|
||||
int is_skas_winch(int pid, int fd, void *data)
|
||||
{
|
||||
if(pid != os_getpgrp())
|
||||
return(0);
|
||||
|
||||
register_winch_irq(-1, fd, -1, data);
|
||||
return(1);
|
||||
}
|
||||
|
||||
void wait_stub_done(int pid, int sig, char * fname)
|
||||
{
|
||||
int n, status, err;
|
||||
|
||||
do {
|
||||
if ( sig != -1 ) {
|
||||
err = ptrace(PTRACE_CONT, pid, 0, sig);
|
||||
if(err)
|
||||
panic("%s : continue failed, errno = %d\n",
|
||||
fname, errno);
|
||||
}
|
||||
sig = 0;
|
||||
|
||||
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
|
||||
} while((n >= 0) && WIFSTOPPED(status) &&
|
||||
((WSTOPSIG(status) == SIGVTALRM) ||
|
||||
/* running UML inside a detached screen can cause
|
||||
* SIGWINCHes
|
||||
*/
|
||||
(WSTOPSIG(status) == SIGWINCH)));
|
||||
|
||||
if((n < 0) || !WIFSTOPPED(status) ||
|
||||
(WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
|
||||
unsigned long regs[HOST_FRAME_SIZE];
|
||||
|
||||
if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
|
||||
printk("Failed to get registers from stub, "
|
||||
"errno = %d\n", errno);
|
||||
else {
|
||||
int i;
|
||||
|
||||
printk("Stub registers -\n");
|
||||
for(i = 0; i < HOST_FRAME_SIZE; i++)
|
||||
printk("\t%d - %lx\n", i, regs[i]);
|
||||
}
|
||||
panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
|
||||
"pid = %d, n = %d, errno = %d, status = 0x%x\n",
|
||||
fname, pid, n, errno, status);
|
||||
}
|
||||
}
|
||||
|
||||
extern unsigned long current_stub_stack(void);
|
||||
|
||||
void get_skas_faultinfo(int pid, struct faultinfo * fi)
|
||||
{
|
||||
int err;
|
||||
|
||||
if(ptrace_faultinfo){
|
||||
err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
|
||||
if(err)
|
||||
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));
|
||||
}
|
||||
else {
|
||||
wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo");
|
||||
|
||||
/* faultinfo is prepared by the stub-segv-handler at start of
|
||||
* the stub stack page. We just have to copy it.
|
||||
*/
|
||||
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
|
||||
}
|
||||
}
|
||||
|
||||
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)*/
|
||||
static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
|
||||
{
|
||||
int err, status;
|
||||
|
||||
/* Mark this as a syscall */
|
||||
UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
|
||||
|
||||
if (!local_using_sysemu)
|
||||
{
|
||||
err = ptrace(PTRACE_POKEUSR, 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);
|
||||
|
||||
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
|
||||
if((err < 0) || !WIFSTOPPED(status) ||
|
||||
(WSTOPSIG(status) != SIGTRAP + 0x80))
|
||||
panic("handle_trap - failed to wait at end of syscall, "
|
||||
"errno = %d, status = %d\n", errno, status);
|
||||
}
|
||||
|
||||
handle_syscall(regs);
|
||||
}
|
||||
|
||||
extern int __syscall_stub_start;
|
||||
int stub_code_fd = -1;
|
||||
__u64 stub_code_offset;
|
||||
|
||||
static int userspace_tramp(void *stack)
|
||||
{
|
||||
void *addr;
|
||||
|
||||
ptrace(PTRACE_TRACEME, 0, 0, 0);
|
||||
|
||||
init_new_thread_signals(1);
|
||||
enable_timer();
|
||||
|
||||
if(!proc_mm){
|
||||
/* This has a pte, but it can't be mapped in with the usual
|
||||
* tlb_flush mechanism because this is part of that mechanism
|
||||
*/
|
||||
addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(),
|
||||
PROT_EXEC, MAP_FIXED | MAP_PRIVATE,
|
||||
stub_code_fd, stub_code_offset);
|
||||
if(addr == MAP_FAILED){
|
||||
printk("mapping stub code failed, errno = %d\n",
|
||||
errno);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if(stack != NULL){
|
||||
int fd;
|
||||
__u64 offset;
|
||||
fd = phys_mapping(to_phys(stack), &offset);
|
||||
addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(),
|
||||
PROT_READ | PROT_WRITE,
|
||||
MAP_FIXED | MAP_SHARED, fd, offset);
|
||||
if(addr == MAP_FAILED){
|
||||
printk("mapping stub stack failed, "
|
||||
"errno = %d\n", errno);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
if(!ptrace_faultinfo){
|
||||
unsigned long v = UML_CONFIG_STUB_CODE +
|
||||
(unsigned long) stub_segv_handler -
|
||||
(unsigned long) &__syscall_stub_start;
|
||||
|
||||
set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size());
|
||||
set_handler(SIGSEGV, (void *) v, SA_ONSTACK,
|
||||
SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
|
||||
SIGUSR1, -1);
|
||||
}
|
||||
|
||||
os_stop_process(os_getpid());
|
||||
return(0);
|
||||
}
|
||||
|
||||
/* Each element set once, and only accessed by a single processor anyway */
|
||||
#undef NR_CPUS
|
||||
#define NR_CPUS 1
|
||||
int userspace_pid[NR_CPUS];
|
||||
|
||||
int start_userspace(unsigned long stub_stack)
|
||||
{
|
||||
void *stack;
|
||||
unsigned long sp;
|
||||
int pid, status, n, flags;
|
||||
|
||||
if ( stub_code_fd == -1 )
|
||||
stub_code_fd = phys_mapping(to_phys(&__syscall_stub_start),
|
||||
&stub_code_offset);
|
||||
|
||||
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 *);
|
||||
|
||||
flags = CLONE_FILES | SIGCHLD;
|
||||
if(proc_mm) flags |= CLONE_VM;
|
||||
pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
|
||||
if(pid < 0)
|
||||
panic("start_userspace : clone failed, errno = %d", errno);
|
||||
|
||||
do {
|
||||
CATCH_EINTR(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 (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0)
|
||||
panic("start_userspace : PTRACE_OLDSETOPTIONS failed, errno=%d\n",
|
||||
errno);
|
||||
|
||||
if(munmap(stack, PAGE_SIZE) < 0)
|
||||
panic("start_userspace : munmap failed, errno = %d\n", errno);
|
||||
|
||||
return(pid);
|
||||
}
|
||||
|
||||
void userspace(union uml_pt_regs *regs)
|
||||
{
|
||||
int err, status, op, pid = userspace_pid[0];
|
||||
int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
|
||||
|
||||
while(1){
|
||||
restore_registers(pid, regs);
|
||||
|
||||
/* 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);
|
||||
|
||||
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
|
||||
if(err < 0)
|
||||
panic("userspace - waitpid failed, errno = %d\n",
|
||||
errno);
|
||||
|
||||
regs->skas.is_user = 1;
|
||||
save_registers(pid, regs);
|
||||
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
|
||||
|
||||
if(WIFSTOPPED(status)){
|
||||
switch(WSTOPSIG(status)){
|
||||
case SIGSEGV:
|
||||
if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo)
|
||||
user_signal(SIGSEGV, regs, pid);
|
||||
else handle_segv(pid, regs);
|
||||
break;
|
||||
case SIGTRAP + 0x80:
|
||||
handle_trap(pid, regs, local_using_sysemu);
|
||||
break;
|
||||
case SIGTRAP:
|
||||
relay_signal(SIGTRAP, regs);
|
||||
break;
|
||||
case SIGIO:
|
||||
case SIGVTALRM:
|
||||
case SIGILL:
|
||||
case SIGBUS:
|
||||
case SIGFPE:
|
||||
case SIGWINCH:
|
||||
user_signal(WSTOPSIG(status), regs, pid);
|
||||
break;
|
||||
default:
|
||||
printk("userspace - child stopped with signal "
|
||||
"%d\n", WSTOPSIG(status));
|
||||
}
|
||||
again:
|
||||
pid = userspace_pid[0];
|
||||
interrupt_end();
|
||||
|
||||
/* Avoid -ERESTARTSYS handling in host */
|
||||
if(PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
|
||||
PT_SYSCALL_NR(regs->skas.regs) = -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
#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
|
||||
|
||||
int copy_context_skas0(unsigned long new_stack, int pid)
|
||||
{
|
||||
int err;
|
||||
unsigned long regs[MAX_REG_NR];
|
||||
unsigned long current_stack = current_stub_stack();
|
||||
struct stub_data *data = (struct stub_data *) current_stack;
|
||||
struct stub_data *child_data = (struct stub_data *) new_stack;
|
||||
__u64 new_offset;
|
||||
int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
|
||||
|
||||
/* prepare offset and fd of child's stack as argument for parent's
|
||||
* and child's mmap2 calls
|
||||
*/
|
||||
*data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset),
|
||||
.fd = new_fd,
|
||||
.timer = ((struct itimerval)
|
||||
{ { 0, 1000000 / hz() },
|
||||
{ 0, 1000000 / hz() }})});
|
||||
get_safe_registers(regs);
|
||||
|
||||
/* Set parent's instruction pointer to start of clone-stub */
|
||||
regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
|
||||
(unsigned long) stub_clone_handler -
|
||||
(unsigned long) &__syscall_stub_start;
|
||||
regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
|
||||
sizeof(void *);
|
||||
#ifdef __SIGNAL_FRAMESIZE
|
||||
regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
|
||||
#endif
|
||||
err = ptrace_setregs(pid, regs);
|
||||
if(err < 0)
|
||||
panic("copy_context_skas0 : PTRACE_SETREGS failed, "
|
||||
"pid = %d, errno = %d\n", pid, errno);
|
||||
|
||||
/* set a well known return code for detection of child write failure */
|
||||
child_data->err = 12345678;
|
||||
|
||||
/* Wait, until parent has finished its work: read child's pid from
|
||||
* parent's stack, and check, if bad result.
|
||||
*/
|
||||
wait_stub_done(pid, 0, "copy_context_skas0");
|
||||
|
||||
pid = data->err;
|
||||
if(pid < 0)
|
||||
panic("copy_context_skas0 - stub-parent reports error %d\n",
|
||||
pid);
|
||||
|
||||
/* Wait, until child has finished too: read child's result from
|
||||
* child's stack and check it.
|
||||
*/
|
||||
wait_stub_done(pid, -1, "copy_context_skas0");
|
||||
if (child_data->err != UML_CONFIG_STUB_DATA)
|
||||
panic("copy_context_skas0 - stub-child reports error %d\n",
|
||||
child_data->err);
|
||||
|
||||
if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
|
||||
(void *)PTRACE_O_TRACESYSGOOD) < 0)
|
||||
panic("copy_context_skas0 : PTRACE_OLDSETOPTIONS failed, "
|
||||
"errno = %d\n", errno);
|
||||
|
||||
return pid;
|
||||
}
|
||||
|
||||
/*
|
||||
* This is used only, if stub pages are needed, while proc_mm is
|
||||
* availabl. Opening /proc/mm creates a new mm_context, which lacks
|
||||
* the stub-pages. Thus, we map them using /proc/mm-fd
|
||||
*/
|
||||
void map_stub_pages(int fd, unsigned long code,
|
||||
unsigned long data, unsigned long stack)
|
||||
{
|
||||
struct proc_mm_op mmop;
|
||||
int n;
|
||||
|
||||
mmop = ((struct proc_mm_op) { .op = MM_MMAP,
|
||||
.u =
|
||||
{ .mmap =
|
||||
{ .addr = code,
|
||||
.len = PAGE_SIZE,
|
||||
.prot = PROT_EXEC,
|
||||
.flags = MAP_FIXED | MAP_PRIVATE,
|
||||
.fd = stub_code_fd,
|
||||
.offset = stub_code_offset
|
||||
} } });
|
||||
n = os_write_file(fd, &mmop, sizeof(mmop));
|
||||
if(n != sizeof(mmop))
|
||||
panic("map_stub_pages : /proc/mm map for code failed, "
|
||||
"err = %d\n", -n);
|
||||
|
||||
if ( stack ) {
|
||||
__u64 map_offset;
|
||||
int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
|
||||
mmop = ((struct proc_mm_op)
|
||||
{ .op = MM_MMAP,
|
||||
.u =
|
||||
{ .mmap =
|
||||
{ .addr = data,
|
||||
.len = PAGE_SIZE,
|
||||
.prot = PROT_READ | PROT_WRITE,
|
||||
.flags = MAP_FIXED | MAP_SHARED,
|
||||
.fd = map_fd,
|
||||
.offset = map_offset
|
||||
} } });
|
||||
n = os_write_file(fd, &mmop, sizeof(mmop));
|
||||
if(n != sizeof(mmop))
|
||||
panic("map_stub_pages : /proc/mm map for data failed, "
|
||||
"err = %d\n", -n);
|
||||
}
|
||||
}
|
||||
|
||||
void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
|
||||
void (*handler)(int))
|
||||
{
|
||||
unsigned long flags;
|
||||
sigjmp_buf switch_buf, fork_buf;
|
||||
|
||||
*switch_buf_ptr = &switch_buf;
|
||||
*fork_buf_ptr = &fork_buf;
|
||||
|
||||
/* Somewhat subtle - siglongjmp restores the signal mask before doing
|
||||
* the longjmp. This means that when jumping from one stack to another
|
||||
* when the target stack has interrupts enabled, an interrupt may occur
|
||||
* on the source stack. This is bad when starting up a process because
|
||||
* it's not supposed to get timer ticks until it has been scheduled.
|
||||
* So, we disable interrupts around the sigsetjmp to ensure that
|
||||
* they can't happen until we get back here where they are safe.
|
||||
*/
|
||||
flags = get_signals();
|
||||
block_signals();
|
||||
if(sigsetjmp(fork_buf, 1) == 0)
|
||||
new_thread_proc(stack, handler);
|
||||
|
||||
remove_sigstack();
|
||||
|
||||
set_signals(flags);
|
||||
}
|
||||
|
||||
void thread_wait(void *sw, void *fb)
|
||||
{
|
||||
sigjmp_buf buf, **switch_buf = sw, *fork_buf;
|
||||
|
||||
*switch_buf = &buf;
|
||||
fork_buf = fb;
|
||||
if(sigsetjmp(buf, 1) == 0)
|
||||
siglongjmp(*fork_buf, INIT_JMP_REMOVE_SIGSTACK);
|
||||
}
|
||||
|
||||
void switch_threads(void *me, void *next)
|
||||
{
|
||||
sigjmp_buf my_buf, **me_ptr = me, *next_buf = next;
|
||||
|
||||
*me_ptr = &my_buf;
|
||||
if(sigsetjmp(my_buf, 1) == 0)
|
||||
siglongjmp(*next_buf, 1);
|
||||
}
|
||||
|
||||
static sigjmp_buf initial_jmpbuf;
|
||||
|
||||
/* XXX Make these percpu */
|
||||
static void (*cb_proc)(void *arg);
|
||||
static void *cb_arg;
|
||||
static sigjmp_buf *cb_back;
|
||||
|
||||
int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
|
||||
{
|
||||
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);
|
||||
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);
|
||||
break;
|
||||
case INIT_JMP_HALT:
|
||||
kmalloc_ok = 0;
|
||||
return(0);
|
||||
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);
|
||||
}
|
||||
|
||||
void initial_thread_cb_skas(void (*proc)(void *), void *arg)
|
||||
{
|
||||
sigjmp_buf here;
|
||||
|
||||
cb_proc = proc;
|
||||
cb_arg = arg;
|
||||
cb_back = &here;
|
||||
|
||||
block_signals();
|
||||
if(sigsetjmp(here, 1) == 0)
|
||||
siglongjmp(initial_jmpbuf, INIT_JMP_CALLBACK);
|
||||
unblock_signals();
|
||||
|
||||
cb_proc = NULL;
|
||||
cb_arg = NULL;
|
||||
cb_back = NULL;
|
||||
}
|
||||
|
||||
void halt_skas(void)
|
||||
{
|
||||
block_signals();
|
||||
siglongjmp(initial_jmpbuf, INIT_JMP_HALT);
|
||||
}
|
||||
|
||||
void reboot_skas(void)
|
||||
{
|
||||
block_signals();
|
||||
siglongjmp(initial_jmpbuf, INIT_JMP_REBOOT);
|
||||
}
|
||||
|
||||
void switch_mm_skas(struct mm_id *mm_idp)
|
||||
{
|
||||
int err;
|
||||
|
||||
#warning need cpu pid in switch_mm_skas
|
||||
if(proc_mm){
|
||||
err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
|
||||
mm_idp->u.mm_fd);
|
||||
if(err)
|
||||
panic("switch_mm_skas - PTRACE_SWITCH_MM failed, "
|
||||
"errno = %d\n", errno);
|
||||
}
|
||||
else userspace_pid[0] = mm_idp->u.pid;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user