435 строки
13 KiB
C
435 строки
13 KiB
C
/*
|
|
* linux/arch/unicore32/kernel/signal.c
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/tracehook.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/unistd.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/ucontext.h>
|
|
|
|
/*
|
|
* For UniCore syscalls, we encode the syscall number into the instruction.
|
|
*/
|
|
#define SWI_SYS_SIGRETURN (0xff000000) /* error number for new abi */
|
|
#define SWI_SYS_RT_SIGRETURN (0xff000000 | (__NR_rt_sigreturn))
|
|
#define SWI_SYS_RESTART (0xff000000 | (__NR_restart_syscall))
|
|
|
|
#define KERN_SIGRETURN_CODE (KUSER_VECPAGE_BASE + 0x00000500)
|
|
#define KERN_RESTART_CODE (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes))
|
|
|
|
const unsigned long sigreturn_codes[3] = {
|
|
SWI_SYS_SIGRETURN, SWI_SYS_RT_SIGRETURN,
|
|
};
|
|
|
|
const unsigned long syscall_restart_code[2] = {
|
|
SWI_SYS_RESTART, /* swi __NR_restart_syscall */
|
|
0x69efc004, /* ldr pc, [sp], #4 */
|
|
};
|
|
|
|
/*
|
|
* Do a signal return; undo the signal stack. These are aligned to 64-bit.
|
|
*/
|
|
struct sigframe {
|
|
struct ucontext uc;
|
|
unsigned long retcode[2];
|
|
};
|
|
|
|
struct rt_sigframe {
|
|
struct siginfo info;
|
|
struct sigframe sig;
|
|
};
|
|
|
|
static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
|
|
{
|
|
sigset_t set;
|
|
int err;
|
|
|
|
err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
|
|
if (err == 0)
|
|
set_current_blocked(&set);
|
|
|
|
err |= __get_user(regs->UCreg_00, &sf->uc.uc_mcontext.regs.UCreg_00);
|
|
err |= __get_user(regs->UCreg_01, &sf->uc.uc_mcontext.regs.UCreg_01);
|
|
err |= __get_user(regs->UCreg_02, &sf->uc.uc_mcontext.regs.UCreg_02);
|
|
err |= __get_user(regs->UCreg_03, &sf->uc.uc_mcontext.regs.UCreg_03);
|
|
err |= __get_user(regs->UCreg_04, &sf->uc.uc_mcontext.regs.UCreg_04);
|
|
err |= __get_user(regs->UCreg_05, &sf->uc.uc_mcontext.regs.UCreg_05);
|
|
err |= __get_user(regs->UCreg_06, &sf->uc.uc_mcontext.regs.UCreg_06);
|
|
err |= __get_user(regs->UCreg_07, &sf->uc.uc_mcontext.regs.UCreg_07);
|
|
err |= __get_user(regs->UCreg_08, &sf->uc.uc_mcontext.regs.UCreg_08);
|
|
err |= __get_user(regs->UCreg_09, &sf->uc.uc_mcontext.regs.UCreg_09);
|
|
err |= __get_user(regs->UCreg_10, &sf->uc.uc_mcontext.regs.UCreg_10);
|
|
err |= __get_user(regs->UCreg_11, &sf->uc.uc_mcontext.regs.UCreg_11);
|
|
err |= __get_user(regs->UCreg_12, &sf->uc.uc_mcontext.regs.UCreg_12);
|
|
err |= __get_user(regs->UCreg_13, &sf->uc.uc_mcontext.regs.UCreg_13);
|
|
err |= __get_user(regs->UCreg_14, &sf->uc.uc_mcontext.regs.UCreg_14);
|
|
err |= __get_user(regs->UCreg_15, &sf->uc.uc_mcontext.regs.UCreg_15);
|
|
err |= __get_user(regs->UCreg_16, &sf->uc.uc_mcontext.regs.UCreg_16);
|
|
err |= __get_user(regs->UCreg_17, &sf->uc.uc_mcontext.regs.UCreg_17);
|
|
err |= __get_user(regs->UCreg_18, &sf->uc.uc_mcontext.regs.UCreg_18);
|
|
err |= __get_user(regs->UCreg_19, &sf->uc.uc_mcontext.regs.UCreg_19);
|
|
err |= __get_user(regs->UCreg_20, &sf->uc.uc_mcontext.regs.UCreg_20);
|
|
err |= __get_user(regs->UCreg_21, &sf->uc.uc_mcontext.regs.UCreg_21);
|
|
err |= __get_user(regs->UCreg_22, &sf->uc.uc_mcontext.regs.UCreg_22);
|
|
err |= __get_user(regs->UCreg_23, &sf->uc.uc_mcontext.regs.UCreg_23);
|
|
err |= __get_user(regs->UCreg_24, &sf->uc.uc_mcontext.regs.UCreg_24);
|
|
err |= __get_user(regs->UCreg_25, &sf->uc.uc_mcontext.regs.UCreg_25);
|
|
err |= __get_user(regs->UCreg_26, &sf->uc.uc_mcontext.regs.UCreg_26);
|
|
err |= __get_user(regs->UCreg_fp, &sf->uc.uc_mcontext.regs.UCreg_fp);
|
|
err |= __get_user(regs->UCreg_ip, &sf->uc.uc_mcontext.regs.UCreg_ip);
|
|
err |= __get_user(regs->UCreg_sp, &sf->uc.uc_mcontext.regs.UCreg_sp);
|
|
err |= __get_user(regs->UCreg_lr, &sf->uc.uc_mcontext.regs.UCreg_lr);
|
|
err |= __get_user(regs->UCreg_pc, &sf->uc.uc_mcontext.regs.UCreg_pc);
|
|
err |= __get_user(regs->UCreg_asr, &sf->uc.uc_mcontext.regs.UCreg_asr);
|
|
|
|
err |= !valid_user_regs(regs);
|
|
|
|
return err;
|
|
}
|
|
|
|
asmlinkage int __sys_rt_sigreturn(struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe __user *frame;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current->restart_block.fn = do_no_restart_syscall;
|
|
|
|
/*
|
|
* Since we stacked the signal on a 64-bit boundary,
|
|
* then 'sp' should be word aligned here. If it's
|
|
* not, then the user is trying to mess with us.
|
|
*/
|
|
if (regs->UCreg_sp & 7)
|
|
goto badframe;
|
|
|
|
frame = (struct rt_sigframe __user *)regs->UCreg_sp;
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
goto badframe;
|
|
|
|
if (restore_sigframe(regs, &frame->sig))
|
|
goto badframe;
|
|
|
|
if (restore_altstack(&frame->sig.uc.uc_stack))
|
|
goto badframe;
|
|
|
|
return regs->UCreg_00;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
static int setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs,
|
|
sigset_t *set)
|
|
{
|
|
int err = 0;
|
|
|
|
err |= __put_user(regs->UCreg_00, &sf->uc.uc_mcontext.regs.UCreg_00);
|
|
err |= __put_user(regs->UCreg_01, &sf->uc.uc_mcontext.regs.UCreg_01);
|
|
err |= __put_user(regs->UCreg_02, &sf->uc.uc_mcontext.regs.UCreg_02);
|
|
err |= __put_user(regs->UCreg_03, &sf->uc.uc_mcontext.regs.UCreg_03);
|
|
err |= __put_user(regs->UCreg_04, &sf->uc.uc_mcontext.regs.UCreg_04);
|
|
err |= __put_user(regs->UCreg_05, &sf->uc.uc_mcontext.regs.UCreg_05);
|
|
err |= __put_user(regs->UCreg_06, &sf->uc.uc_mcontext.regs.UCreg_06);
|
|
err |= __put_user(regs->UCreg_07, &sf->uc.uc_mcontext.regs.UCreg_07);
|
|
err |= __put_user(regs->UCreg_08, &sf->uc.uc_mcontext.regs.UCreg_08);
|
|
err |= __put_user(regs->UCreg_09, &sf->uc.uc_mcontext.regs.UCreg_09);
|
|
err |= __put_user(regs->UCreg_10, &sf->uc.uc_mcontext.regs.UCreg_10);
|
|
err |= __put_user(regs->UCreg_11, &sf->uc.uc_mcontext.regs.UCreg_11);
|
|
err |= __put_user(regs->UCreg_12, &sf->uc.uc_mcontext.regs.UCreg_12);
|
|
err |= __put_user(regs->UCreg_13, &sf->uc.uc_mcontext.regs.UCreg_13);
|
|
err |= __put_user(regs->UCreg_14, &sf->uc.uc_mcontext.regs.UCreg_14);
|
|
err |= __put_user(regs->UCreg_15, &sf->uc.uc_mcontext.regs.UCreg_15);
|
|
err |= __put_user(regs->UCreg_16, &sf->uc.uc_mcontext.regs.UCreg_16);
|
|
err |= __put_user(regs->UCreg_17, &sf->uc.uc_mcontext.regs.UCreg_17);
|
|
err |= __put_user(regs->UCreg_18, &sf->uc.uc_mcontext.regs.UCreg_18);
|
|
err |= __put_user(regs->UCreg_19, &sf->uc.uc_mcontext.regs.UCreg_19);
|
|
err |= __put_user(regs->UCreg_20, &sf->uc.uc_mcontext.regs.UCreg_20);
|
|
err |= __put_user(regs->UCreg_21, &sf->uc.uc_mcontext.regs.UCreg_21);
|
|
err |= __put_user(regs->UCreg_22, &sf->uc.uc_mcontext.regs.UCreg_22);
|
|
err |= __put_user(regs->UCreg_23, &sf->uc.uc_mcontext.regs.UCreg_23);
|
|
err |= __put_user(regs->UCreg_24, &sf->uc.uc_mcontext.regs.UCreg_24);
|
|
err |= __put_user(regs->UCreg_25, &sf->uc.uc_mcontext.regs.UCreg_25);
|
|
err |= __put_user(regs->UCreg_26, &sf->uc.uc_mcontext.regs.UCreg_26);
|
|
err |= __put_user(regs->UCreg_fp, &sf->uc.uc_mcontext.regs.UCreg_fp);
|
|
err |= __put_user(regs->UCreg_ip, &sf->uc.uc_mcontext.regs.UCreg_ip);
|
|
err |= __put_user(regs->UCreg_sp, &sf->uc.uc_mcontext.regs.UCreg_sp);
|
|
err |= __put_user(regs->UCreg_lr, &sf->uc.uc_mcontext.regs.UCreg_lr);
|
|
err |= __put_user(regs->UCreg_pc, &sf->uc.uc_mcontext.regs.UCreg_pc);
|
|
err |= __put_user(regs->UCreg_asr, &sf->uc.uc_mcontext.regs.UCreg_asr);
|
|
|
|
err |= __put_user(current->thread.trap_no,
|
|
&sf->uc.uc_mcontext.trap_no);
|
|
err |= __put_user(current->thread.error_code,
|
|
&sf->uc.uc_mcontext.error_code);
|
|
err |= __put_user(current->thread.address,
|
|
&sf->uc.uc_mcontext.fault_address);
|
|
err |= __put_user(set->sig[0], &sf->uc.uc_mcontext.oldmask);
|
|
|
|
err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void __user *get_sigframe(struct k_sigaction *ka,
|
|
struct pt_regs *regs, int framesize)
|
|
{
|
|
unsigned long sp = regs->UCreg_sp;
|
|
void __user *frame;
|
|
|
|
/*
|
|
* This is the X/Open sanctioned signal stack switching.
|
|
*/
|
|
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
|
|
/*
|
|
* ATPCS B01 mandates 8-byte alignment
|
|
*/
|
|
frame = (void __user *)((sp - framesize) & ~7);
|
|
|
|
/*
|
|
* Check that we can actually write to the signal frame.
|
|
*/
|
|
if (!access_ok(VERIFY_WRITE, frame, framesize))
|
|
frame = NULL;
|
|
|
|
return frame;
|
|
}
|
|
|
|
static int setup_return(struct pt_regs *regs, struct k_sigaction *ka,
|
|
unsigned long __user *rc, void __user *frame, int usig)
|
|
{
|
|
unsigned long handler = (unsigned long)ka->sa.sa_handler;
|
|
unsigned long retcode;
|
|
unsigned long asr = regs->UCreg_asr & ~PSR_f;
|
|
|
|
unsigned int idx = 0;
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
idx += 1;
|
|
|
|
if (__put_user(sigreturn_codes[idx], rc) ||
|
|
__put_user(sigreturn_codes[idx+1], rc+1))
|
|
return 1;
|
|
|
|
retcode = KERN_SIGRETURN_CODE + (idx << 2);
|
|
|
|
regs->UCreg_00 = usig;
|
|
regs->UCreg_sp = (unsigned long)frame;
|
|
regs->UCreg_lr = retcode;
|
|
regs->UCreg_pc = handler;
|
|
regs->UCreg_asr = asr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_frame(struct ksignal *ksig, sigset_t *set,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct sigframe __user *frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
|
|
int err = 0;
|
|
|
|
if (!frame)
|
|
return 1;
|
|
|
|
/*
|
|
* Set uc.uc_flags to a value which sc.trap_no would never have.
|
|
*/
|
|
err |= __put_user(0x5ac3c35a, &frame->uc.uc_flags);
|
|
|
|
err |= setup_sigframe(frame, regs, set);
|
|
if (err == 0)
|
|
err |= setup_return(regs, &ksig->ka, frame->retcode, frame,
|
|
ksig->sig);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe __user *frame =
|
|
get_sigframe(&ksig->ka, regs, sizeof(*frame));
|
|
int err = 0;
|
|
|
|
if (!frame)
|
|
return 1;
|
|
|
|
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
|
|
|
|
err |= __put_user(0, &frame->sig.uc.uc_flags);
|
|
err |= __put_user(NULL, &frame->sig.uc.uc_link);
|
|
err |= __save_altstack(&frame->sig.uc.uc_stack, regs->UCreg_sp);
|
|
err |= setup_sigframe(&frame->sig, regs, set);
|
|
if (err == 0)
|
|
err |= setup_return(regs, &ksig->ka, frame->sig.retcode, frame,
|
|
ksig->sig);
|
|
|
|
if (err == 0) {
|
|
/*
|
|
* For realtime signals we must also set the second and third
|
|
* arguments for the signal handler.
|
|
*/
|
|
regs->UCreg_01 = (unsigned long)&frame->info;
|
|
regs->UCreg_02 = (unsigned long)&frame->sig.uc;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void setup_syscall_restart(struct pt_regs *regs)
|
|
{
|
|
regs->UCreg_00 = regs->UCreg_ORIG_00;
|
|
regs->UCreg_pc -= 4;
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs,
|
|
int syscall)
|
|
{
|
|
struct thread_info *thread = current_thread_info();
|
|
sigset_t *oldset = sigmask_to_save();
|
|
int usig = ksig->sig;
|
|
int ret;
|
|
|
|
/*
|
|
* If we were from a system call, check for system call restarting...
|
|
*/
|
|
if (syscall) {
|
|
switch (regs->UCreg_00) {
|
|
case -ERESTART_RESTARTBLOCK:
|
|
case -ERESTARTNOHAND:
|
|
regs->UCreg_00 = -EINTR;
|
|
break;
|
|
case -ERESTARTSYS:
|
|
if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
|
|
regs->UCreg_00 = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
setup_syscall_restart(regs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* translate the signal
|
|
*/
|
|
if (usig < 32 && thread->exec_domain
|
|
&& thread->exec_domain->signal_invmap)
|
|
usig = thread->exec_domain->signal_invmap[usig];
|
|
|
|
/*
|
|
* Set up the stack frame
|
|
*/
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
|
|
ret = setup_rt_frame(ksig, oldset, regs);
|
|
else
|
|
ret = setup_frame(ksig, oldset, regs);
|
|
|
|
/*
|
|
* Check that the resulting registers are actually sane.
|
|
*/
|
|
ret |= !valid_user_regs(regs);
|
|
|
|
signal_setup_done(ret, ksig, 0);
|
|
}
|
|
|
|
/*
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
* mistake.
|
|
*
|
|
* Note that we go through the signals twice: once to check the signals that
|
|
* the kernel can handle, and then we build all the user-level signal handling
|
|
* stack-frames in one go after that.
|
|
*/
|
|
static void do_signal(struct pt_regs *regs, int syscall)
|
|
{
|
|
struct ksignal ksig;
|
|
|
|
/*
|
|
* We want the common case to go fast, which
|
|
* is why we may in certain cases get here from
|
|
* kernel mode. Just return without doing anything
|
|
* if so.
|
|
*/
|
|
if (!user_mode(regs))
|
|
return;
|
|
|
|
if (get_signal(&ksig)) {
|
|
handle_signal(&ksig, regs, syscall);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* No signal to deliver to the process - restart the syscall.
|
|
*/
|
|
if (syscall) {
|
|
if (regs->UCreg_00 == -ERESTART_RESTARTBLOCK) {
|
|
u32 __user *usp;
|
|
|
|
regs->UCreg_sp -= 4;
|
|
usp = (u32 __user *)regs->UCreg_sp;
|
|
|
|
if (put_user(regs->UCreg_pc, usp) == 0) {
|
|
regs->UCreg_pc = KERN_RESTART_CODE;
|
|
} else {
|
|
regs->UCreg_sp += 4;
|
|
force_sigsegv(0, current);
|
|
}
|
|
}
|
|
if (regs->UCreg_00 == -ERESTARTNOHAND ||
|
|
regs->UCreg_00 == -ERESTARTSYS ||
|
|
regs->UCreg_00 == -ERESTARTNOINTR) {
|
|
setup_syscall_restart(regs);
|
|
}
|
|
}
|
|
/* If there's no signal to deliver, we just put the saved
|
|
* sigmask back.
|
|
*/
|
|
restore_saved_sigmask();
|
|
}
|
|
|
|
asmlinkage void do_notify_resume(struct pt_regs *regs,
|
|
unsigned int thread_flags, int syscall)
|
|
{
|
|
if (thread_flags & _TIF_SIGPENDING)
|
|
do_signal(regs, syscall);
|
|
|
|
if (thread_flags & _TIF_NOTIFY_RESUME) {
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
|
tracehook_notify_resume(regs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Copy signal return handlers into the vector page, and
|
|
* set sigreturn to be a pointer to these.
|
|
*/
|
|
void __init early_signal_init(void)
|
|
{
|
|
memcpy((void *)kuser_vecpage_to_vectors(KERN_SIGRETURN_CODE),
|
|
sigreturn_codes, sizeof(sigreturn_codes));
|
|
memcpy((void *)kuser_vecpage_to_vectors(KERN_RESTART_CODE),
|
|
syscall_restart_code, sizeof(syscall_restart_code));
|
|
/* Need not to flush icache, since early_trap_init will do it last. */
|
|
}
|