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Diffstat (limited to 'arch/arm64/mm/fault.c')
-rw-r--r--arch/arm64/mm/fault.c72
1 files changed, 13 insertions, 59 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index b64958b23a7f..22168cd0dde7 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -105,13 +105,11 @@ static void data_abort_decode(unsigned int esr)
(esr & ESR_ELx_WNR) >> ESR_ELx_WNR_SHIFT);
}
-/*
- * Decode mem abort information
- */
static void mem_abort_decode(unsigned int esr)
{
pr_alert("Mem abort info:\n");
+ pr_alert(" ESR = 0x%08x\n", esr);
pr_alert(" Exception class = %s, IL = %u bits\n",
esr_get_class_string(esr),
(esr & ESR_ELx_IL) ? 32 : 16);
@@ -249,9 +247,6 @@ static inline bool is_permission_fault(unsigned int esr, struct pt_regs *regs,
return false;
}
-/*
- * The kernel tried to access some page that wasn't present.
- */
static void __do_kernel_fault(unsigned long addr, unsigned int esr,
struct pt_regs *regs)
{
@@ -264,9 +259,6 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
if (!is_el1_instruction_abort(esr) && fixup_exception(regs))
return;
- /*
- * No handler, we'll have to terminate things with extreme prejudice.
- */
bust_spinlocks(1);
if (is_permission_fault(esr, regs, addr)) {
@@ -291,10 +283,6 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
do_exit(SIGKILL);
}
-/*
- * Something tried to access memory that isn't in our memory map. User mode
- * accesses just cause a SIGSEGV
- */
static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
unsigned int esr, unsigned int sig, int code,
struct pt_regs *regs, int fault)
@@ -559,23 +547,6 @@ no_context:
return 0;
}
-/*
- * First Level Translation Fault Handler
- *
- * We enter here because the first level page table doesn't contain a valid
- * entry for the address.
- *
- * If the address is in kernel space (>= TASK_SIZE), then we are probably
- * faulting in the vmalloc() area.
- *
- * If the init_task's first level page tables contains the relevant entry, we
- * copy the it to this task. If not, we send the process a signal, fixup the
- * exception, or oops the kernel.
- *
- * NOTE! We MUST NOT take any locks for this case. We may be in an interrupt
- * or a critical region, and should only copy the information from the master
- * page table, nothing more.
- */
static int __kprobes do_translation_fault(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
@@ -594,18 +565,11 @@ static int do_alignment_fault(unsigned long addr, unsigned int esr,
return 0;
}
-/*
- * This abort handler always returns "fault".
- */
static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
{
- return 1;
+ return 1; /* "fault" */
}
-/*
- * This abort handler deals with Synchronous External Abort.
- * It calls notifiers, and then returns "fault".
- */
static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
{
struct siginfo info;
@@ -668,14 +632,14 @@ static const struct fault_info fault_info[] = {
{ do_sea, SIGBUS, 0, "level 1 (translation table walk)" },
{ do_sea, SIGBUS, 0, "level 2 (translation table walk)" },
{ do_sea, SIGBUS, 0, "level 3 (translation table walk)" },
- { do_sea, SIGBUS, 0, "synchronous parity or ECC error" },
+ { do_sea, SIGBUS, 0, "synchronous parity or ECC error" }, // Reserved when RAS is implemented
{ do_bad, SIGBUS, 0, "unknown 25" },
{ do_bad, SIGBUS, 0, "unknown 26" },
{ do_bad, SIGBUS, 0, "unknown 27" },
- { do_sea, SIGBUS, 0, "level 0 synchronous parity error (translation table walk)" },
- { do_sea, SIGBUS, 0, "level 1 synchronous parity error (translation table walk)" },
- { do_sea, SIGBUS, 0, "level 2 synchronous parity error (translation table walk)" },
- { do_sea, SIGBUS, 0, "level 3 synchronous parity error (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 0 synchronous parity error (translation table walk)" }, // Reserved when RAS is implemented
+ { do_sea, SIGBUS, 0, "level 1 synchronous parity error (translation table walk)" }, // Reserved when RAS is implemented
+ { do_sea, SIGBUS, 0, "level 2 synchronous parity error (translation table walk)" }, // Reserved when RAS is implemented
+ { do_sea, SIGBUS, 0, "level 3 synchronous parity error (translation table walk)" }, // Reserved when RAS is implemented
{ do_bad, SIGBUS, 0, "unknown 32" },
{ do_alignment_fault, SIGBUS, BUS_ADRALN, "alignment fault" },
{ do_bad, SIGBUS, 0, "unknown 34" },
@@ -693,7 +657,7 @@ static const struct fault_info fault_info[] = {
{ do_bad, SIGBUS, 0, "unknown 46" },
{ do_bad, SIGBUS, 0, "unknown 47" },
{ do_bad, SIGBUS, 0, "TLB conflict abort" },
- { do_bad, SIGBUS, 0, "unknown 49" },
+ { do_bad, SIGBUS, 0, "Unsupported atomic hardware update fault" },
{ do_bad, SIGBUS, 0, "unknown 50" },
{ do_bad, SIGBUS, 0, "unknown 51" },
{ do_bad, SIGBUS, 0, "implementation fault (lockdown abort)" },
@@ -710,13 +674,6 @@ static const struct fault_info fault_info[] = {
{ do_bad, SIGBUS, 0, "unknown 63" },
};
-/*
- * Handle Synchronous External Aborts that occur in a guest kernel.
- *
- * The return value will be zero if the SEA was successfully handled
- * and non-zero if there was an error processing the error or there was
- * no error to process.
- */
int handle_guest_sea(phys_addr_t addr, unsigned int esr)
{
int ret = -ENOENT;
@@ -727,9 +684,6 @@ int handle_guest_sea(phys_addr_t addr, unsigned int esr)
return ret;
}
-/*
- * Dispatch a data abort to the relevant handler.
- */
asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
struct pt_regs *regs)
{
@@ -739,11 +693,14 @@ asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
if (!inf->fn(addr, esr, regs))
return;
- pr_alert("Unhandled fault: %s (0x%08x) at 0x%016lx\n",
- inf->name, esr, addr);
+ pr_alert("Unhandled fault: %s at 0x%016lx\n",
+ inf->name, addr);
mem_abort_decode(esr);
+ if (!user_mode(regs))
+ show_pte(addr);
+
info.si_signo = inf->sig;
info.si_errno = 0;
info.si_code = inf->code;
@@ -751,9 +708,6 @@ asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
arm64_notify_die("", regs, &info, esr);
}
-/*
- * Handle stack alignment exceptions.
- */
asmlinkage void __exception do_sp_pc_abort(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
generated by cgit (git 2.34.1) at 2024-05-04 11:34:31 +0000