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Diffstat (limited to 'arch/mips/kernel/traps.c')
-rw-r--r--arch/mips/kernel/traps.c105
1 files changed, 46 insertions, 59 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 808b8b61ded1..0b4e06303c55 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -72,6 +72,8 @@
#include <asm/mach-loongson64/cpucfg-emul.h>
+#include "access-helper.h"
+
extern void check_wait(void);
extern asmlinkage void rollback_handle_int(void);
extern asmlinkage void handle_int(void);
@@ -108,7 +110,8 @@ void (*board_bind_eic_interrupt)(int irq, int regset);
void (*board_ebase_setup)(void);
void(*board_cache_error_setup)(void);
-static void show_raw_backtrace(unsigned long reg29, const char *loglvl)
+static void show_raw_backtrace(unsigned long reg29, const char *loglvl,
+ bool user)
{
unsigned long *sp = (unsigned long *)(reg29 & ~3);
unsigned long addr;
@@ -118,9 +121,7 @@ static void show_raw_backtrace(unsigned long reg29, const char *loglvl)
printk("%s\n", loglvl);
#endif
while (!kstack_end(sp)) {
- unsigned long __user *p =
- (unsigned long __user *)(unsigned long)sp++;
- if (__get_user(addr, p)) {
+ if (__get_addr(&addr, sp++, user)) {
printk("%s (Bad stack address)", loglvl);
break;
}
@@ -141,7 +142,7 @@ __setup("raw_show_trace", set_raw_show_trace);
#endif
static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
- const char *loglvl)
+ const char *loglvl, bool user)
{
unsigned long sp = regs->regs[29];
unsigned long ra = regs->regs[31];
@@ -151,7 +152,7 @@ static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
task = current;
if (raw_show_trace || user_mode(regs) || !__kernel_text_address(pc)) {
- show_raw_backtrace(sp, loglvl);
+ show_raw_backtrace(sp, loglvl, user);
return;
}
printk("%sCall Trace:\n", loglvl);
@@ -167,12 +168,12 @@ static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
* with at least a bit of error checking ...
*/
static void show_stacktrace(struct task_struct *task,
- const struct pt_regs *regs, const char *loglvl)
+ const struct pt_regs *regs, const char *loglvl, bool user)
{
const int field = 2 * sizeof(unsigned long);
- long stackdata;
+ unsigned long stackdata;
int i;
- unsigned long __user *sp = (unsigned long __user *)regs->regs[29];
+ unsigned long *sp = (unsigned long *)regs->regs[29];
printk("%sStack :", loglvl);
i = 0;
@@ -186,7 +187,7 @@ static void show_stacktrace(struct task_struct *task,
break;
}
- if (__get_user(stackdata, sp++)) {
+ if (__get_addr(&stackdata, sp++, user)) {
pr_cont(" (Bad stack address)");
break;
}
@@ -195,13 +196,12 @@ static void show_stacktrace(struct task_struct *task,
i++;
}
pr_cont("\n");
- show_backtrace(task, regs, loglvl);
+ show_backtrace(task, regs, loglvl, user);
}
void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
{
struct pt_regs regs;
- mm_segment_t old_fs = get_fs();
regs.cp0_status = KSU_KERNEL;
if (sp) {
@@ -217,33 +217,41 @@ void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
prepare_frametrace(&regs);
}
}
- /*
- * show_stack() deals exclusively with kernel mode, so be sure to access
- * the stack in the kernel (not user) address space.
- */
- set_fs(KERNEL_DS);
- show_stacktrace(task, &regs, loglvl);
- set_fs(old_fs);
+ show_stacktrace(task, &regs, loglvl, false);
}
-static void show_code(unsigned int __user *pc)
+static void show_code(void *pc, bool user)
{
long i;
- unsigned short __user *pc16 = NULL;
+ unsigned short *pc16 = NULL;
printk("Code:");
if ((unsigned long)pc & 1)
- pc16 = (unsigned short __user *)((unsigned long)pc & ~1);
+ pc16 = (u16 *)((unsigned long)pc & ~1);
+
for(i = -3 ; i < 6 ; i++) {
- unsigned int insn;
- if (pc16 ? __get_user(insn, pc16 + i) : __get_user(insn, pc + i)) {
- pr_cont(" (Bad address in epc)\n");
- break;
+ if (pc16) {
+ u16 insn16;
+
+ if (__get_inst16(&insn16, pc16 + i, user))
+ goto bad_address;
+
+ pr_cont("%c%04x%c", (i?' ':'<'), insn16, (i?' ':'>'));
+ } else {
+ u32 insn32;
+
+ if (__get_inst32(&insn32, (u32 *)pc + i, user))
+ goto bad_address;
+
+ pr_cont("%c%08x%c", (i?' ':'<'), insn32, (i?' ':'>'));
}
- pr_cont("%c%0*x%c", (i?' ':'<'), pc16 ? 4 : 8, insn, (i?' ':'>'));
}
pr_cont("\n");
+ return;
+
+bad_address:
+ pr_cont(" (Bad address in epc)\n\n");
}
static void __show_regs(const struct pt_regs *regs)
@@ -356,7 +364,6 @@ void show_regs(struct pt_regs *regs)
void show_registers(struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
- mm_segment_t old_fs = get_fs();
__show_regs(regs);
print_modules();
@@ -371,13 +378,9 @@ void show_registers(struct pt_regs *regs)
printk("*HwTLS: %0*lx\n", field, tls);
}
- if (!user_mode(regs))
- /* Necessary for getting the correct stack content */
- set_fs(KERNEL_DS);
- show_stacktrace(current, regs, KERN_DEFAULT);
- show_code((unsigned int __user *) regs->cp0_epc);
+ show_stacktrace(current, regs, KERN_DEFAULT, user_mode(regs));
+ show_code((void *)regs->cp0_epc, user_mode(regs));
printk("\n");
- set_fs(old_fs);
}
static DEFINE_RAW_SPINLOCK(die_lock);
@@ -1022,18 +1025,14 @@ asmlinkage void do_bp(struct pt_regs *regs)
unsigned long epc = msk_isa16_mode(exception_epc(regs));
unsigned int opcode, bcode;
enum ctx_state prev_state;
- mm_segment_t seg;
-
- seg = get_fs();
- if (!user_mode(regs))
- set_fs(KERNEL_DS);
+ bool user = user_mode(regs);
prev_state = exception_enter();
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (get_isa16_mode(regs->cp0_epc)) {
u16 instr[2];
- if (__get_user(instr[0], (u16 __user *)epc))
+ if (__get_inst16(&instr[0], (u16 *)epc, user))
goto out_sigsegv;
if (!cpu_has_mmips) {
@@ -1044,13 +1043,13 @@ asmlinkage void do_bp(struct pt_regs *regs)
bcode = instr[0] & 0xf;
} else {
/* 32-bit microMIPS BREAK */
- if (__get_user(instr[1], (u16 __user *)(epc + 2)))
+ if (__get_inst16(&instr[1], (u16 *)(epc + 2), user))
goto out_sigsegv;
opcode = (instr[0] << 16) | instr[1];
bcode = (opcode >> 6) & ((1 << 20) - 1);
}
} else {
- if (__get_user(opcode, (unsigned int __user *)epc))
+ if (__get_inst32(&opcode, (u32 *)epc, user))
goto out_sigsegv;
bcode = (opcode >> 6) & ((1 << 20) - 1);
}
@@ -1100,7 +1099,6 @@ asmlinkage void do_bp(struct pt_regs *regs)
do_trap_or_bp(regs, bcode, TRAP_BRKPT, "Break");
out:
- set_fs(seg);
exception_exit(prev_state);
return;
@@ -1114,25 +1112,21 @@ asmlinkage void do_tr(struct pt_regs *regs)
u32 opcode, tcode = 0;
enum ctx_state prev_state;
u16 instr[2];
- mm_segment_t seg;
+ bool user = user_mode(regs);
unsigned long epc = msk_isa16_mode(exception_epc(regs));
- seg = get_fs();
- if (!user_mode(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)) {
- if (__get_user(instr[0], (u16 __user *)(epc + 0)) ||
- __get_user(instr[1], (u16 __user *)(epc + 2)))
+ if (__get_inst16(&instr[0], (u16 *)(epc + 0), user) ||
+ __get_inst16(&instr[1], (u16 *)(epc + 2), user))
goto out_sigsegv;
opcode = (instr[0] << 16) | instr[1];
/* Immediate versions don't provide a code. */
if (!(opcode & OPCODE))
tcode = (opcode >> 12) & ((1 << 4) - 1);
} else {
- if (__get_user(opcode, (u32 __user *)epc))
+ if (__get_inst32(&opcode, (u32 *)epc, user))
goto out_sigsegv;
/* Immediate versions don't provide a code. */
if (!(opcode & OPCODE))
@@ -1142,7 +1136,6 @@ asmlinkage void do_tr(struct pt_regs *regs)
do_trap_or_bp(regs, tcode, 0, "Trap");
out:
- set_fs(seg);
exception_exit(prev_state);
return;
@@ -1591,7 +1584,6 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
{
int multi_match = regs->cp0_status & ST0_TS;
enum ctx_state prev_state;
- mm_segment_t old_fs = get_fs();
prev_state = exception_enter();
show_regs(regs);
@@ -1602,12 +1594,7 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
dump_tlb_all();
}
- if (!user_mode(regs))
- set_fs(KERNEL_DS);
-
- show_code((unsigned int __user *) regs->cp0_epc);
-
- set_fs(old_fs);
+ show_code((void *)regs->cp0_epc, user_mode(regs));
/*
* Some chips may have other causes of machine check (e.g. SB1
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