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Diffstat (limited to 'arch/mips/kernel/traps.c')
-rw-r--r--arch/mips/kernel/traps.c103
1 files changed, 74 insertions, 29 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index f9165d1a17b..80b9e070c20 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -23,6 +23,8 @@
#include <linux/bootmem.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -40,10 +42,14 @@
#include <asm/tlbdebug.h>
#include <asm/traps.h>
#include <asm/uaccess.h>
+#include <asm/watch.h>
#include <asm/mmu_context.h>
#include <asm/types.h>
#include <asm/stacktrace.h>
+extern void check_wait(void);
+extern asmlinkage void r4k_wait(void);
+extern asmlinkage void rollback_handle_int(void);
extern asmlinkage void handle_int(void);
extern asmlinkage void handle_tlbm(void);
extern asmlinkage void handle_tlbl(void);
@@ -71,7 +77,6 @@ extern asmlinkage void handle_reserved(void);
extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
struct mips_fpu_struct *ctx, int has_fpu);
-void (*board_watchpoint_handler)(struct pt_regs *regs);
void (*board_be_init)(void);
int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
void (*board_nmi_handler_setup)(void);
@@ -249,11 +254,11 @@ static void __show_regs(const struct pt_regs *regs)
/*
* Saved cp0 registers
*/
- printk("epc : %0*lx ", field, regs->cp0_epc);
- print_symbol("%s ", regs->cp0_epc);
+ printk("epc : %0*lx %pS\n", field, regs->cp0_epc,
+ (void *) regs->cp0_epc);
printk(" %s\n", print_tainted());
- printk("ra : %0*lx ", field, regs->regs[31]);
- print_symbol("%s\n", regs->regs[31]);
+ printk("ra : %0*lx %pS\n", field, regs->regs[31],
+ (void *) regs->regs[31]);
printk("Status: %08x ", (uint32_t) regs->cp0_status);
@@ -372,8 +377,8 @@ void __noreturn die(const char * str, const struct pt_regs * regs)
do_exit(SIGSEGV);
}
-extern const struct exception_table_entry __start___dbe_table[];
-extern const struct exception_table_entry __stop___dbe_table[];
+extern struct exception_table_entry __start___dbe_table[];
+extern struct exception_table_entry __stop___dbe_table[];
__asm__(
" .section __dbe_table, \"a\"\n"
@@ -426,6 +431,10 @@ 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, SIGBUS, 0, 0)
+ == NOTIFY_STOP)
+ return;
+
die_if_kernel("Oops", regs);
force_sig(SIGBUS, current);
}
@@ -624,6 +633,9 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
{
siginfo_t info;
+ if (notify_die(DIE_FP, "FP exception", regs, SIGFPE, 0, 0)
+ == NOTIFY_STOP)
+ return;
die_if_kernel("FP exception in kernel code", regs);
if (fcr31 & FPU_CSR_UNI_X) {
@@ -683,6 +695,9 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
siginfo_t info;
char b[40];
+ if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
+ return;
+
/*
* A short test says that IRIX 5.3 sends SIGTRAP for all trap
* insns, even for trap and break codes that indicate arithmetic
@@ -763,6 +778,10 @@ asmlinkage void do_ri(struct pt_regs *regs)
unsigned int opcode = 0;
int status = -1;
+ if (notify_die(DIE_RI, "RI Fault", regs, SIGSEGV, 0, 0)
+ == NOTIFY_STOP)
+ return;
+
die_if_kernel("Reserved instruction in kernel code", regs);
if (unlikely(compute_return_epc(regs) < 0))
@@ -807,8 +826,10 @@ static void mt_ase_fp_affinity(void)
if (cpus_intersects(current->cpus_allowed, mt_fpu_cpumask)) {
cpumask_t tmask;
- cpus_and(tmask, current->thread.user_cpus_allowed,
- mt_fpu_cpumask);
+ current->thread.user_cpus_allowed
+ = current->cpus_allowed;
+ cpus_and(tmask, current->cpus_allowed,
+ mt_fpu_cpumask);
set_cpus_allowed(current, tmask);
set_thread_flag(TIF_FPUBOUND);
}
@@ -892,18 +913,26 @@ asmlinkage void do_mdmx(struct pt_regs *regs)
asmlinkage void do_watch(struct pt_regs *regs)
{
- if (board_watchpoint_handler) {
- (*board_watchpoint_handler)(regs);
- return;
- }
+ u32 cause;
/*
- * We use the watch exception where available to detect stack
- * overflows.
+ * Clear WP (bit 22) bit of cause register so we don't loop
+ * forever.
*/
- dump_tlb_all();
- show_regs(regs);
- panic("Caught WATCH exception - probably caused by stack overflow.");
+ cause = read_c0_cause();
+ cause &= ~(1 << 22);
+ write_c0_cause(cause);
+
+ /*
+ * If the current thread has the watch registers loaded, save
+ * their values and send SIGTRAP. Otherwise another thread
+ * left the registers set, clear them and continue.
+ */
+ if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) {
+ mips_read_watch_registers();
+ force_sig(SIGTRAP, current);
+ } else
+ mips_clear_watch_registers();
}
asmlinkage void do_mcheck(struct pt_regs *regs)
@@ -1190,7 +1219,7 @@ void *set_except_vector(int n, void *addr)
if (n == 0 && cpu_has_divec) {
*(u32 *)(ebase + 0x200) = 0x08000000 |
(0x03ffffff & (handler >> 2));
- flush_icache_range(ebase + 0x200, ebase + 0x204);
+ local_flush_icache_range(ebase + 0x200, ebase + 0x204);
}
return (void *)old_handler;
}
@@ -1241,6 +1270,9 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
extern char except_vec_vi, except_vec_vi_lui;
extern char except_vec_vi_ori, except_vec_vi_end;
+ extern char rollback_except_vec_vi;
+ char *vec_start = (cpu_wait == r4k_wait) ?
+ &rollback_except_vec_vi : &except_vec_vi;
#ifdef CONFIG_MIPS_MT_SMTC
/*
* We need to provide the SMTC vectored interrupt handler
@@ -1248,11 +1280,11 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
* Status.IM bit to be masked before going there.
*/
extern char except_vec_vi_mori;
- const int mori_offset = &except_vec_vi_mori - &except_vec_vi;
+ const int mori_offset = &except_vec_vi_mori - vec_start;
#endif /* CONFIG_MIPS_MT_SMTC */
- const int handler_len = &except_vec_vi_end - &except_vec_vi;
- const int lui_offset = &except_vec_vi_lui - &except_vec_vi;
- const int ori_offset = &except_vec_vi_ori - &except_vec_vi;
+ const int handler_len = &except_vec_vi_end - vec_start;
+ const int lui_offset = &except_vec_vi_lui - vec_start;
+ const int ori_offset = &except_vec_vi_ori - vec_start;
if (handler_len > VECTORSPACING) {
/*
@@ -1262,7 +1294,7 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
panic("VECTORSPACING too small");
}
- memcpy(b, &except_vec_vi, handler_len);
+ memcpy(b, vec_start, handler_len);
#ifdef CONFIG_MIPS_MT_SMTC
BUG_ON(n > 7); /* Vector index %d exceeds SMTC maximum. */
@@ -1273,7 +1305,8 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
*w = (*w & 0xffff0000) | (((u32)handler >> 16) & 0xffff);
w = (u32 *)(b + ori_offset);
*w = (*w & 0xffff0000) | ((u32)handler & 0xffff);
- flush_icache_range((unsigned long)b, (unsigned long)(b+handler_len));
+ local_flush_icache_range((unsigned long)b,
+ (unsigned long)(b+handler_len));
}
else {
/*
@@ -1285,7 +1318,8 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
w = (u32 *)b;
*w++ = 0x08000000 | (((u32)handler >> 2) & 0x03fffff); /* j handler */
*w = 0;
- flush_icache_range((unsigned long)b, (unsigned long)(b+8));
+ local_flush_icache_range((unsigned long)b,
+ (unsigned long)(b+8));
}
return (void *)old_handler;
@@ -1505,7 +1539,7 @@ void __cpuinit per_cpu_trap_init(void)
void __init set_handler(unsigned long offset, void *addr, unsigned long size)
{
memcpy((void *)(ebase + offset), addr, size);
- flush_icache_range(ebase + offset, ebase + offset + size);
+ local_flush_icache_range(ebase + offset, ebase + offset + size);
}
static char panic_null_cerr[] __cpuinitdata =
@@ -1542,6 +1576,15 @@ void __init trap_init(void)
extern char except_vec3_generic, except_vec3_r4000;
extern char except_vec4;
unsigned long i;
+ int rollback;
+
+ check_wait();
+ rollback = (cpu_wait == r4k_wait);
+
+#if defined(CONFIG_KGDB)
+ if (kgdb_early_setup)
+ return; /* Already done */
+#endif
if (cpu_has_veic || cpu_has_vint)
ebase = (unsigned long) alloc_bootmem_low_pages(0x200 + VECTORSPACING*64);
@@ -1601,7 +1644,7 @@ void __init trap_init(void)
if (board_be_init)
board_be_init();
- set_except_vector(0, handle_int);
+ set_except_vector(0, rollback ? rollback_handle_int : handle_int);
set_except_vector(1, handle_tlbm);
set_except_vector(2, handle_tlbl);
set_except_vector(3, handle_tlbs);
@@ -1665,6 +1708,8 @@ void __init trap_init(void)
signal32_init();
#endif
- flush_icache_range(ebase, ebase + 0x400);
+ local_flush_icache_range(ebase, ebase + 0x400);
flush_tlb_handlers();
+
+ sort_extable(__start___dbe_table, __stop___dbe_table);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 09:48:49 +0000