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authorRalf Baechle <ralf@linux-mips.org>2015-07-28 20:37:43 +0200
committerRalf Baechle <ralf@linux-mips.org>2015-09-03 12:08:04 +0200
commite3b28831c18c6c95c51b6bb717fa116d2b658ba9 (patch)
tree643aec907cb2a9df80a2824719dcfc7dd5853bb8
parent8c576912e4708144cbaa28228cc910746f39bafd (diff)
downloadop-kernel-dev-e3b28831c18c6c95c51b6bb717fa116d2b658ba9.zip
op-kernel-dev-e3b28831c18c6c95c51b6bb717fa116d2b658ba9.tar.gz
MIPS: Set trap_no field in thread_struct on exception.
This reverts commit 7281cd22973008a782860e48ed8d85d00204168c and adds actual functionality to use the field.
-rw-r--r--arch/mips/include/asm/processor.h2
-rw-r--r--arch/mips/kernel/asm-offsets.c1
-rw-r--r--arch/mips/kernel/traps.c28
-rw-r--r--arch/mips/mm/fault.c8
4 files changed, 21 insertions, 18 deletions
diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 9b3b48e..59ee6dc 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -275,6 +275,7 @@ struct thread_struct {
unsigned long cp0_badvaddr; /* Last user fault */
unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
unsigned long error_code;
+ unsigned long trap_nr;
#ifdef CONFIG_CPU_CAVIUM_OCTEON
struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
@@ -341,6 +342,7 @@ struct thread_struct {
.cp0_badvaddr = 0, \
.cp0_baduaddr = 0, \
.error_code = 0, \
+ .trap_nr = 0, \
/* \
* Platform specific cop2 registers(null if no COP2) \
*/ \
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index 3706091b..154e203 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -128,6 +128,7 @@ void output_thread_defines(void)
thread.cp0_baduaddr);
OFFSET(THREAD_ECODE, task_struct, \
thread.error_code);
+ OFFSET(THREAD_TRAPNO, task_struct, thread.trap_nr);
BLANK();
}
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index da0b318..cea964d 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -370,11 +370,6 @@ void show_registers(struct pt_regs *regs)
set_fs(old_fs);
}
-static int regs_to_trapnr(struct pt_regs *regs)
-{
- return (regs->cp0_cause >> 2) & 0x1f;
-}
-
static DEFINE_RAW_SPINLOCK(die_lock);
void __noreturn die(const char *str, struct pt_regs *regs)
@@ -384,7 +379,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
oops_enter();
- if (notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr,
SIGSEGV) == NOTIFY_STOP)
sig = 0;
@@ -470,7 +465,7 @@ asmlinkage void do_be(struct pt_regs *regs)
printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
data ? "Data" : "Instruction",
field, regs->cp0_epc, field, regs->regs[31]);
- if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_OOPS, "bus error", regs, 0, current->thread.trap_nr,
SIGBUS) == NOTIFY_STOP)
goto out;
@@ -826,7 +821,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
int sig;
prev_state = exception_enter();
- if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_FP, "FP exception", regs, 0, current->thread.trap_nr,
SIGFPE) == NOTIFY_STOP)
goto out;
@@ -882,11 +877,12 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
char b[40];
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
- if (kgdb_ll_trap(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
+ if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr,
+ SIGTRAP) == NOTIFY_STOP)
return;
#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
- if (notify_die(DIE_TRAP, str, regs, code, regs_to_trapnr(regs),
+ if (notify_die(DIE_TRAP, str, regs, code, current->thread.trap_nr,
SIGTRAP) == NOTIFY_STOP)
return;
@@ -948,6 +944,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
set_fs(KERNEL_DS);
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (get_isa16_mode(regs->cp0_epc)) {
u16 instr[2];
@@ -989,13 +986,13 @@ asmlinkage void do_bp(struct pt_regs *regs)
switch (bcode) {
case BRK_KPROBE_BP:
if (notify_die(DIE_BREAK, "debug", regs, bcode,
- regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
case BRK_KPROBE_SSTEPBP:
if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode,
- regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
@@ -1028,6 +1025,7 @@ asmlinkage void do_tr(struct pt_regs *regs)
set_fs(get_ds());
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (get_isa16_mode(regs->cp0_epc)) {
if (__get_user(instr[0], (u16 __user *)(epc + 0)) ||
__get_user(instr[1], (u16 __user *)(epc + 2)))
@@ -1094,8 +1092,9 @@ asmlinkage void do_ri(struct pt_regs *regs)
no_r2_instr:
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
- if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_RI, "RI Fault", regs, 0, current->thread.trap_nr,
SIGILL) == NOTIFY_STOP)
goto out;
@@ -1444,8 +1443,9 @@ asmlinkage void do_msa_fpe(struct pt_regs *regs, unsigned int msacsr)
enum ctx_state prev_state;
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (notify_die(DIE_MSAFP, "MSA FP exception", regs, 0,
- regs_to_trapnr(regs), SIGFPE) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGFPE) == NOTIFY_STOP)
goto out;
/* Clear MSACSR.Cause before enabling interrupts */
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 852a41c..4b88fa03 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -57,12 +57,10 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
#ifdef CONFIG_KPROBES
/*
- * This is to notify the fault handler of the kprobes. The
- * exception code is redundant as it is also carried in REGS,
- * but we pass it anyhow.
+ * This is to notify the fault handler of the kprobes.
*/
if (notify_die(DIE_PAGE_FAULT, "page fault", regs, -1,
- (regs->cp0_cause >> 2) & 0x1f, SIGSEGV) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
return;
#endif
@@ -224,6 +222,7 @@ bad_area_nosemaphore:
print_vma_addr(" ", regs->regs[31]);
pr_info("\n");
}
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
@@ -282,6 +281,7 @@ do_sigbus:
field, (unsigned long) regs->cp0_epc,
field, (unsigned long) regs->regs[31]);
#endif
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
tsk->thread.cp0_badvaddr = address;
info.si_signo = SIGBUS;
info.si_errno = 0;
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