Skip to content

Commit

Permalink
---
Browse files Browse the repository at this point in the history 
yaml
---
r: 151137
b: refs/heads/master
c: 82bd1d7
h: refs/heads/master
i:
  151135: 51dfa27
v: v3
  • Loading branch information
Mike Frysinger committed Jun 13, 2009
1 parent cd5b9d7 commit 285db79
Show file tree
Hide file tree
Showing 2 changed files with 44 additions and 46 deletions.
2 changes: 1 addition & 1 deletion [refs]
View file
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 6510a20e1b1a3a5703429a09d03adf44882ae373
refs/heads/master: 82bd1d7d45a69c54fb6beedb78ccb1c7d308dd93
88 changes: 43 additions & 45 deletions trunk/arch/blackfin/kernel/traps.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,11 @@ asmlinkage void double_fault_c(struct pt_regs *fp)

}

static int kernel_mode_regs(struct pt_regs *regs)
{
return regs->ipend & 0xffc0;
}

asmlinkage void trap_c(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
Expand All @@ -247,6 +252,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
unsigned int cpu = smp_processor_id();
#endif
const char *strerror = NULL;
int sig = 0;
siginfo_t info;
unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
Expand All @@ -260,27 +266,10 @@ asmlinkage void trap_c(struct pt_regs *fp)
* double faults if the stack has become corrupt
*/

/* If the fault was caused by a kernel thread, or interrupt handler
* we will kernel panic, so the system reboots.
* If KGDB is enabled, don't set this for kernel breakpoints
*/

/* TODO: check to see if we are in some sort of deferred HWERR
* that we should be able to recover from, not kernel panic
*/
if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
#ifdef CONFIG_KGDB
&& (trapnr != VEC_EXCPT02)
#ifndef CONFIG_KGDB
/* IPEND is skipped if KGDB isn't enabled (see entry code) */
fp->ipend = bfin_read_IPEND();
#endif
){
console_verbose();
oops_in_progress = 1;
} else if (current) {
if (current->mm == NULL) {
console_verbose();
oops_in_progress = 1;
}
}

/* trap_c() will be called for exceptions. During exceptions
* processing, the pc value should be set with retx value.
Expand Down Expand Up @@ -308,15 +297,15 @@ asmlinkage void trap_c(struct pt_regs *fp)
sig = SIGTRAP;
CHK_DEBUGGER_TRAP_MAYBE();
/* Check if this is a breakpoint in kernel space */
if (fp->ipend & 0xffc0)
if (kernel_mode_regs(fp))
goto traps_done;
else
break;
/* 0x03 - User Defined, userspace stack overflow */
case VEC_EXCPT03:
info.si_code = SEGV_STACKFLOW;
sig = SIGSEGV;
verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x02 - KGDB initial connection and break signal trap */
Expand Down Expand Up @@ -345,7 +334,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
case VEC_EXCPT04 ... VEC_EXCPT15:
info.si_code = ILL_ILLPARAOP;
sig = SIGILL;
verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x10 HW Single step, handled here */
Expand All @@ -354,15 +343,15 @@ asmlinkage void trap_c(struct pt_regs *fp)
sig = SIGTRAP;
CHK_DEBUGGER_TRAP_MAYBE();
/* Check if this is a single step in kernel space */
if (fp->ipend & 0xffc0)
if (kernel_mode_regs(fp))
goto traps_done;
else
break;
/* 0x11 - Trace Buffer Full, handled here */
case VEC_OVFLOW:
info.si_code = TRAP_TRACEFLOW;
sig = SIGTRAP;
verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x12 - Reserved, Caught by default */
Expand Down Expand Up @@ -401,54 +390,54 @@ asmlinkage void trap_c(struct pt_regs *fp)
#endif
info.si_code = ILL_ILLOPC;
sig = SIGILL;
verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x22 - Illegal Instruction Combination, handled here */
case VEC_ILGAL_I:
info.si_code = ILL_ILLPARAOP;
sig = SIGILL;
verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x23 - Data CPLB protection violation, handled here */
case VEC_CPLB_VL:
info.si_code = ILL_CPLB_VI;
sig = SIGBUS;
verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x24 - Data access misaligned, handled here */
case VEC_MISALI_D:
info.si_code = BUS_ADRALN;
sig = SIGBUS;
verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x25 - Unrecoverable Event, handled here */
case VEC_UNCOV:
info.si_code = ILL_ILLEXCPT;
sig = SIGILL;
verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
error case is handled here */
case VEC_CPLB_M:
info.si_code = BUS_ADRALN;
sig = SIGBUS;
verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
break;
/* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
case VEC_CPLB_MHIT:
info.si_code = ILL_CPLB_MULHIT;
sig = SIGSEGV;
#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
verbose_printk(KERN_NOTICE "NULL pointer access\n");
strerror = KERN_NOTICE "NULL pointer access\n";
else
#endif
verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x28 - Emulation Watchpoint, handled here */
Expand All @@ -458,7 +447,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
pr_debug(EXC_0x28(KERN_DEBUG));
CHK_DEBUGGER_TRAP_MAYBE();
/* Check if this is a watchpoint in kernel space */
if (fp->ipend & 0xffc0)
if (kernel_mode_regs(fp))
goto traps_done;
else
break;
Expand All @@ -467,7 +456,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
info.si_code = BUS_OPFETCH;
sig = SIGBUS;
verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
CHK_DEBUGGER_TRAP_MAYBE();
break;
#else
Expand All @@ -477,39 +466,39 @@ asmlinkage void trap_c(struct pt_regs *fp)
case VEC_MISALI_I:
info.si_code = BUS_ADRALN;
sig = SIGBUS;
verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x2B - Instruction CPLB protection violation, handled here */
case VEC_CPLB_I_VL:
info.si_code = ILL_CPLB_VI;
sig = SIGBUS;
verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
case VEC_CPLB_I_M:
info.si_code = ILL_CPLB_MISS;
sig = SIGBUS;
verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
break;
/* 0x2D - Instruction CPLB Multiple Hits, handled here */
case VEC_CPLB_I_MHIT:
info.si_code = ILL_CPLB_MULHIT;
sig = SIGSEGV;
#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
verbose_printk(KERN_NOTICE "Jump to NULL address\n");
strerror = KERN_NOTICE "Jump to NULL address\n";
else
#endif
verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x2E - Illegal use of Supervisor Resource, handled here */
case VEC_ILL_RES:
info.si_code = ILL_PRVOPC;
sig = SIGILL;
verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
/* 0x2F - Reserved, Caught by default */
Expand Down Expand Up @@ -537,17 +526,17 @@ asmlinkage void trap_c(struct pt_regs *fp)
case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
info.si_code = BUS_ADRALN;
sig = SIGBUS;
verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
break;
/* External Memory Addressing Error */
case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
info.si_code = BUS_ADRERR;
sig = SIGBUS;
verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
break;
/* Performance Monitor Overflow */
case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
break;
/* RAISE 5 instruction */
case (SEQSTAT_HWERRCAUSE_RAISE_5):
Expand All @@ -564,7 +553,6 @@ asmlinkage void trap_c(struct pt_regs *fp)
* if we get here we hit a reserved one, so panic
*/
default:
oops_in_progress = 1;
info.si_code = ILL_ILLPARAOP;
sig = SIGILL;
verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
Expand All @@ -575,6 +563,16 @@ asmlinkage void trap_c(struct pt_regs *fp)

BUG_ON(sig == 0);

/* If the fault was caused by a kernel thread, or interrupt handler
* we will kernel panic, so the system reboots.
*/
if (kernel_mode_regs(fp) || (current && !current->mm)) {
console_verbose();
oops_in_progress = 1;
if (strerror)
verbose_printk(strerror);
}

if (sig != SIGTRAP) {
dump_bfin_process(fp);
dump_bfin_mem(fp);
Expand Down

0 comments on commit 285db79

Please sign in to comment.