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-rw-r--r--arch/powerpc/kernel/traps.c111
1 files changed, 51 insertions, 60 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index e435bc0..f783c93 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -60,6 +60,7 @@
#include <asm/switch_to.h>
#include <asm/tm.h>
#include <asm/debug.h>
+#include <sysdev/fsl_pci.h>
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
int (*__debugger)(struct pt_regs *regs) __read_mostly;
@@ -565,6 +566,8 @@ int machine_check_e500(struct pt_regs *regs)
if (reason & MCSR_BUS_RBERR) {
if (fsl_rio_mcheck_exception(regs))
return 1;
+ if (fsl_pci_mcheck_exception(regs))
+ return 1;
}
printk("Machine check in kernel mode.\n");
@@ -962,7 +965,7 @@ static int emulate_instruction(struct pt_regs *regs)
u32 instword;
u32 rd;
- if (!user_mode(regs) || (regs->msr & MSR_LE))
+ if (!user_mode(regs))
return -EINVAL;
CHECK_FULL_REGS(regs);
@@ -1050,11 +1053,41 @@ int is_valid_bugaddr(unsigned long addr)
return is_kernel_addr(addr);
}
+#ifdef CONFIG_MATH_EMULATION
+static int emulate_math(struct pt_regs *regs)
+{
+ int ret;
+ extern int do_mathemu(struct pt_regs *regs);
+
+ ret = do_mathemu(regs);
+ if (ret >= 0)
+ PPC_WARN_EMULATED(math, regs);
+
+ switch (ret) {
+ case 0:
+ emulate_single_step(regs);
+ return 0;
+ case 1: {
+ int code = 0;
+ code = __parse_fpscr(current->thread.fpscr.val);
+ _exception(SIGFPE, regs, code, regs->nip);
+ return 0;
+ }
+ case -EFAULT:
+ _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
+ return 0;
+ }
+
+ return -1;
+}
+#else
+static inline int emulate_math(struct pt_regs *regs) { return -1; }
+#endif
+
void __kprobes program_check_exception(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
unsigned int reason = get_reason(regs);
- extern int do_mathemu(struct pt_regs *regs);
/* We can now get here via a FP Unavailable exception if the core
* has no FPU, in that case the reason flags will be 0 */
@@ -1116,11 +1149,20 @@ void __kprobes program_check_exception(struct pt_regs *regs)
}
#endif
+ /*
+ * If we took the program check in the kernel skip down to sending a
+ * SIGILL. The subsequent cases all relate to emulating instructions
+ * which we should only do for userspace. We also do not want to enable
+ * interrupts for kernel faults because that might lead to further
+ * faults, and loose the context of the original exception.
+ */
+ if (!user_mode(regs))
+ goto sigill;
+
/* We restore the interrupt state now */
if (!arch_irq_disabled_regs(regs))
local_irq_enable();
-#ifdef CONFIG_MATH_EMULATION
/* (reason & REASON_ILLEGAL) would be the obvious thing here,
* but there seems to be a hardware bug on the 405GP (RevD)
* that means ESR is sometimes set incorrectly - either to
@@ -1129,31 +1171,8 @@ void __kprobes program_check_exception(struct pt_regs *regs)
* instruction or only on FP instructions, whether there is a
* pattern to occurrences etc. -dgibson 31/Mar/2003
*/
-
- /*
- * If we support a HW FPU, we need to ensure the FP state
- * if flushed into the thread_struct before attempting
- * emulation
- */
-#ifdef CONFIG_PPC_FPU
- flush_fp_to_thread(current);
-#endif
- switch (do_mathemu(regs)) {
- case 0:
- emulate_single_step(regs);
- goto bail;
- case 1: {
- int code = 0;
- code = __parse_fpscr(current->thread.fpscr.val);
- _exception(SIGFPE, regs, code, regs->nip);
- goto bail;
- }
- case -EFAULT:
- _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
+ if (!emulate_math(regs))
goto bail;
- }
- /* fall through on any other errors */
-#endif /* CONFIG_MATH_EMULATION */
/* Try to emulate it if we should. */
if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
@@ -1168,6 +1187,7 @@ void __kprobes program_check_exception(struct pt_regs *regs)
}
}
+sigill:
if (reason & REASON_PRIVILEGED)
_exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
else
@@ -1322,13 +1342,10 @@ void facility_unavailable_exception(struct pt_regs *regs)
if (status == FSCR_DSCR_LG) {
/* User is acessing the DSCR. Set the inherit bit and allow
* the user to set it directly in future by setting via the
- * H/FSCR DSCR bit.
+ * FSCR DSCR bit. We always leave HFSCR DSCR set.
*/
current->thread.dscr_inherit = 1;
- if (hv)
- mtspr(SPRN_HFSCR, value | HFSCR_DSCR);
- else
- mtspr(SPRN_FSCR, value | FSCR_DSCR);
+ mtspr(SPRN_FSCR, value | FSCR_DSCR);
return;
}
@@ -1444,11 +1461,6 @@ void performance_monitor_exception(struct pt_regs *regs)
#ifdef CONFIG_8xx
void SoftwareEmulation(struct pt_regs *regs)
{
- extern int do_mathemu(struct pt_regs *);
-#if defined(CONFIG_MATH_EMULATION)
- int errcode;
-#endif
-
CHECK_FULL_REGS(regs);
if (!user_mode(regs)) {
@@ -1456,31 +1468,10 @@ void SoftwareEmulation(struct pt_regs *regs)
die("Kernel Mode Software FPU Emulation", regs, SIGFPE);
}
-#ifdef CONFIG_MATH_EMULATION
- errcode = do_mathemu(regs);
- if (errcode >= 0)
- PPC_WARN_EMULATED(math, regs);
-
- switch (errcode) {
- case 0:
- emulate_single_step(regs);
+ if (!emulate_math(regs))
return;
- case 1: {
- int code = 0;
- code = __parse_fpscr(current->thread.fpscr.val);
- _exception(SIGFPE, regs, code, regs->nip);
- return;
- }
- case -EFAULT:
- _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
- return;
- default:
- _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
- return;
- }
-#else
+
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
-#endif
}
#endif /* CONFIG_8xx */
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