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Diffstat (limited to 'arch/arm64/kernel/traps.c')
-rw-r--r--arch/arm64/kernel/traps.c111
1 files changed, 39 insertions, 72 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 5ea4b85aee0e..3d3588fcd1c7 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -38,6 +38,7 @@
#include <asm/atomic.h>
#include <asm/bug.h>
+#include <asm/daifflags.h>
#include <asm/debug-monitors.h>
#include <asm/esr.h>
#include <asm/insn.h>
@@ -58,55 +59,9 @@ static const char *handler[]= {
int show_unhandled_signals = 1;
-/*
- * Dump out the contents of some kernel memory nicely...
- */
-static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
- unsigned long top)
-{
- unsigned long first;
- mm_segment_t fs;
- int i;
-
- /*
- * We need to switch to kernel mode so that we can use __get_user
- * to safely read from kernel space.
- */
- fs = get_fs();
- set_fs(KERNEL_DS);
-
- printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
-
- for (first = bottom & ~31; first < top; first += 32) {
- unsigned long p;
- char str[sizeof(" 12345678") * 8 + 1];
-
- memset(str, ' ', sizeof(str));
- str[sizeof(str) - 1] = '\0';
-
- for (p = first, i = 0; i < (32 / 8)
- && p < top; i++, p += 8) {
- if (p >= bottom && p < top) {
- unsigned long val;
-
- if (__get_user(val, (unsigned long *)p) == 0)
- sprintf(str + i * 17, " %016lx", val);
- else
- sprintf(str + i * 17, " ????????????????");
- }
- }
- printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
- }
-
- set_fs(fs);
-}
-
static void dump_backtrace_entry(unsigned long where)
{
- /*
- * Note that 'where' can have a physical address, but it's not handled.
- */
- print_ip_sym(where);
+ printk(" %pS\n", (void *)where);
}
static void __dump_instr(const char *lvl, struct pt_regs *regs)
@@ -118,7 +73,7 @@ static void __dump_instr(const char *lvl, struct pt_regs *regs)
for (i = -4; i < 1; i++) {
unsigned int val, bad;
- bad = __get_user(val, &((u32 *)addr)[i]);
+ bad = get_user(val, &((u32 *)addr)[i]);
if (!bad)
p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
@@ -171,10 +126,7 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
skip = !!regs;
printk("Call trace:\n");
- while (1) {
- unsigned long stack;
- int ret;
-
+ do {
/* skip until specified stack frame */
if (!skip) {
dump_backtrace_entry(frame.pc);
@@ -189,17 +141,7 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
*/
dump_backtrace_entry(regs->pc);
}
- ret = unwind_frame(tsk, &frame);
- if (ret < 0)
- break;
- if (in_entry_text(frame.pc)) {
- stack = frame.fp - offsetof(struct pt_regs, stackframe);
-
- if (on_accessible_stack(tsk, stack))
- dump_mem("", "Exception stack", stack,
- stack + sizeof(struct pt_regs));
- }
- }
+ } while (!unwind_frame(tsk, &frame));
put_task_stack(tsk);
}
@@ -293,6 +235,17 @@ void arm64_notify_die(const char *str, struct pt_regs *regs,
}
}
+void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size)
+{
+ regs->pc += size;
+
+ /*
+ * If we were single stepping, we want to get the step exception after
+ * we return from the trap.
+ */
+ user_fastforward_single_step(current);
+}
+
static LIST_HEAD(undef_hook);
static DEFINE_RAW_SPINLOCK(undef_lock);
@@ -358,8 +311,8 @@ exit:
return fn ? fn(regs, instr) : 1;
}
-static void force_signal_inject(int signal, int code, struct pt_regs *regs,
- unsigned long address)
+void force_signal_inject(int signal, int code, struct pt_regs *regs,
+ unsigned long address)
{
siginfo_t info;
void __user *pc = (void __user *)instruction_pointer(regs);
@@ -373,7 +326,7 @@ static void force_signal_inject(int signal, int code, struct pt_regs *regs,
desc = "illegal memory access";
break;
default:
- desc = "bad mode";
+ desc = "unknown or unrecoverable error";
break;
}
@@ -480,7 +433,7 @@ static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs)
if (ret)
arm64_notify_segfault(regs, address);
else
- regs->pc += 4;
+ arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
}
static void ctr_read_handler(unsigned int esr, struct pt_regs *regs)
@@ -490,7 +443,7 @@ static void ctr_read_handler(unsigned int esr, struct pt_regs *regs)
pt_regs_write_reg(regs, rt, val);
- regs->pc += 4;
+ arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
}
static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs)
@@ -498,7 +451,7 @@ static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs)
int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
pt_regs_write_reg(regs, rt, arch_counter_get_cntvct());
- regs->pc += 4;
+ arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
}
static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs)
@@ -506,7 +459,7 @@ static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs)
int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
pt_regs_write_reg(regs, rt, arch_timer_get_rate());
- regs->pc += 4;
+ arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
}
struct sys64_hook {
@@ -603,6 +556,7 @@ static const char *esr_class_str[] = {
[ESR_ELx_EC_HVC64] = "HVC (AArch64)",
[ESR_ELx_EC_SMC64] = "SMC (AArch64)",
[ESR_ELx_EC_SYS64] = "MSR/MRS (AArch64)",
+ [ESR_ELx_EC_SVE] = "SVE",
[ESR_ELx_EC_IMP_DEF] = "EL3 IMP DEF",
[ESR_ELx_EC_IABT_LOW] = "IABT (lower EL)",
[ESR_ELx_EC_IABT_CUR] = "IABT (current EL)",
@@ -642,7 +596,7 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
esr_get_class_string(esr));
die("Oops - bad mode", regs, 0);
- local_irq_disable();
+ local_daif_mask();
panic("bad mode");
}
@@ -708,6 +662,19 @@ asmlinkage void handle_bad_stack(struct pt_regs *regs)
}
#endif
+asmlinkage void do_serror(struct pt_regs *regs, unsigned int esr)
+{
+ nmi_enter();
+
+ console_verbose();
+
+ pr_crit("SError Interrupt on CPU%d, code 0x%08x -- %s\n",
+ smp_processor_id(), esr, esr_get_class_string(esr));
+ __show_regs(regs);
+
+ panic("Asynchronous SError Interrupt");
+}
+
void __pte_error(const char *file, int line, unsigned long val)
{
pr_err("%s:%d: bad pte %016lx.\n", file, line, val);
@@ -761,7 +728,7 @@ static int bug_handler(struct pt_regs *regs, unsigned int esr)
}
/* If thread survives, skip over the BUG instruction and continue: */
- regs->pc += AARCH64_INSN_SIZE; /* skip BRK and resume */
+ arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
return DBG_HOOK_HANDLED;
}
generated by cgit (git 2.34.1) at 2024-05-04 05:20:34 +0000