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author | Al Viro <viro@ftp.linux.org.uk> | 2011-08-18 19:03:19 (GMT) |
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committer | Richard Weinberger <richard@nod.at> | 2011-11-02 13:14:51 (GMT) |
commit | 6582b7f7743da6ce3e3714e9e8b18e0e073d4acd (patch) | |
tree | 649346d2333865ccd4bb4d560ceb50c39139c5c2 /arch/um/sys-i386/bugs.c | |
parent | 858ba94499b4f48e9eb0be7cf0092f1ea9460fef (diff) | |
download | linux-fsl-qoriq-6582b7f7743da6ce3e3714e9e8b18e0e073d4acd.tar.xz |
um: merge arch/um/sys-{i386,x86_64}
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/sys-i386/bugs.c')
-rw-r--r-- | arch/um/sys-i386/bugs.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/arch/um/sys-i386/bugs.c b/arch/um/sys-i386/bugs.c deleted file mode 100644 index 7058e1f..0000000 --- a/arch/um/sys-i386/bugs.c +++ /dev/null @@ -1,74 +0,0 @@ -/* - * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) - * Licensed under the GPL - */ - -#include <signal.h> -#include "kern_util.h" -#include "longjmp.h" -#include "task.h" -#include "sysdep/ptrace.h" - -/* Set during early boot */ -static int host_has_cmov = 1; -static jmp_buf cmov_test_return; - -static void cmov_sigill_test_handler(int sig) -{ - host_has_cmov = 0; - longjmp(cmov_test_return, 1); -} - -void arch_check_bugs(void) -{ - struct sigaction old, new; - - printk(UM_KERN_INFO "Checking for host processor cmov support..."); - new.sa_handler = cmov_sigill_test_handler; - - /* Make sure that SIGILL is enabled after the handler longjmps back */ - new.sa_flags = SA_NODEFER; - sigemptyset(&new.sa_mask); - sigaction(SIGILL, &new, &old); - - if (setjmp(cmov_test_return) == 0) { - unsigned long foo = 0; - __asm__ __volatile__("cmovz %0, %1" : "=r" (foo) : "0" (foo)); - printk(UM_KERN_CONT "Yes\n"); - } else - printk(UM_KERN_CONT "No\n"); - - sigaction(SIGILL, &old, &new); -} - -void arch_examine_signal(int sig, struct uml_pt_regs *regs) -{ - unsigned char tmp[2]; - - /* - * This is testing for a cmov (0x0f 0x4x) instruction causing a - * SIGILL in init. - */ - if ((sig != SIGILL) || (TASK_PID(get_current()) != 1)) - return; - - if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2)) { - printk(UM_KERN_ERR "SIGILL in init, could not read " - "instructions!\n"); - return; - } - - if ((tmp[0] != 0x0f) || ((tmp[1] & 0xf0) != 0x40)) - return; - - if (host_has_cmov == 0) - printk(UM_KERN_ERR "SIGILL caused by cmov, which this " - "processor doesn't implement. Boot a filesystem " - "compiled for older processors"); - else if (host_has_cmov == 1) - printk(UM_KERN_ERR "SIGILL caused by cmov, which this " - "processor claims to implement"); - else - printk(UM_KERN_ERR "Bad value for host_has_cmov (%d)", - host_has_cmov); -} |