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parisc: Add error checks when building up signal trampoline handler 

Add checks if the userspace trampoline code was correctly generated by the
signal trampoline generation code. In addition only flush caches as needed and
fix the old flushing code which didn't flushed all generated instructions.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2015-02-03 21:52:47 +01:00
parent fb96a796f2
commit 0bd1e94bf3
1 changed files with 15 additions and 14 deletions
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29
arch/parisc/kernel/signal.c
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@ -476,6 +476,9 @@ insert_restart_trampoline(struct pt_regs *regs)
case -ERESTART_RESTARTBLOCK: {
/* Restart the system call - no handlers present */
unsigned int *usp = (unsigned int *)regs->gr[30];
unsigned long start = (unsigned long) &usp[2];
unsigned long end = (unsigned long) &usp[5];
long err = 0;
/* Setup a trampoline to restart the syscall
* with __NR_restart_syscall
@ -487,23 +490,21 @@ insert_restart_trampoline(struct pt_regs *regs)
* 16: ldi __NR_restart_syscall, %r20
*/
#ifdef CONFIG_64BIT
put_user(regs->gr[31] >> 32, &usp[0]);
put_user(regs->gr[31] & 0xffffffff, &usp[1]);
put_user(0x0fc010df, &usp[2]);
err |= put_user(regs->gr[31] >> 32, &usp[0]);
err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
err |= put_user(0x0fc010df, &usp[2]);
#else
put_user(regs->gr[31], &usp[0]);
put_user(0x0fc0109f, &usp[2]);
err |= put_user(regs->gr[31], &usp[0]);
err |= put_user(0x0fc0109f, &usp[2]);
#endif
put_user(0xe0008200, &usp[3]);
put_user(0x34140000, &usp[4]);
err |= put_user(0xe0008200, &usp[3]);
err |= put_user(0x34140000, &usp[4]);
/* Stack is 64-byte aligned, and we only need
* to flush 1 cache line.
* Flushing one cacheline is cheap.
* "sync" on bigger (> 4 way) boxes is not.
*/
flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4);
flush_user_icache_range(regs->gr[30], regs->gr[30] + 4);
WARN_ON(err);
/* flush data/instruction cache for new insns */
flush_user_dcache_range(start, end);
flush_user_icache_range(start, end);
regs->gr[31] = regs->gr[30] + 8;
return;