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-rw-r--r--arch/powerpc/kernel/traps.c73
1 files changed, 57 insertions, 16 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index f3eb61be0d30..1e48d157196a 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -20,6 +20,7 @@
#include <linux/sched/debug.h>
#include <linux/kernel.h>
#include <linux/mm.h>
+#include <linux/pkeys.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
@@ -38,6 +39,8 @@
#include <linux/ratelimit.h>
#include <linux/context_tracking.h>
#include <linux/smp.h>
+#include <linux/console.h>
+#include <linux/kmsg_dump.h>
#include <asm/emulated_ops.h>
#include <asm/pgtable.h>
@@ -142,6 +145,28 @@ static int die_owner = -1;
static unsigned int die_nest_count;
static int die_counter;
+extern void panic_flush_kmsg_start(void)
+{
+ /*
+ * These are mostly taken from kernel/panic.c, but tries to do
+ * relatively minimal work. Don't use delay functions (TB may
+ * be broken), don't crash dump (need to set a firmware log),
+ * don't run notifiers. We do want to get some information to
+ * Linux console.
+ */
+ console_verbose();
+ bust_spinlocks(1);
+}
+
+extern void panic_flush_kmsg_end(void)
+{
+ printk_safe_flush_on_panic();
+ kmsg_dump(KMSG_DUMP_PANIC);
+ bust_spinlocks(0);
+ debug_locks_off();
+ console_flush_on_panic();
+}
+
static unsigned long oops_begin(struct pt_regs *regs)
{
int cpu;
@@ -266,7 +291,9 @@ void user_single_step_siginfo(struct task_struct *tsk,
info->si_addr = (void __user *)regs->nip;
}
-void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
+
+void _exception_pkey(int signr, struct pt_regs *regs, int code,
+ unsigned long addr, int key)
{
siginfo_t info;
const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \
@@ -289,13 +316,27 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
local_irq_enable();
current->thread.trap_nr = code;
+
+ /*
+ * Save all the pkey registers AMR/IAMR/UAMOR. Eg: Core dumps need
+ * to capture the content, if the task gets killed.
+ */
+ thread_pkey_regs_save(&current->thread);
+
memset(&info, 0, sizeof(info));
info.si_signo = signr;
info.si_code = code;
info.si_addr = (void __user *) addr;
+ info.si_pkey = key;
+
force_sig_info(signr, &info, current);
}
+void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
+{
+ _exception_pkey(signr, regs, code, addr, 0);
+}
+
void system_reset_exception(struct pt_regs *regs)
{
/*
@@ -337,7 +378,7 @@ void system_reset_exception(struct pt_regs *regs)
* No debugger or crash dump registered, print logs then
* panic.
*/
- __die("System Reset", regs, SIGABRT);
+ die("System Reset", regs, SIGABRT);
mdelay(2*MSEC_PER_SEC); /* Wait a little while for others to print */
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
@@ -917,7 +958,7 @@ void unknown_exception(struct pt_regs *regs)
printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
regs->nip, regs->msr, regs->trap);
- _exception(SIGTRAP, regs, 0, 0);
+ _exception(SIGTRAP, regs, TRAP_FIXME, 0);
exception_exit(prev_state);
}
@@ -939,7 +980,7 @@ bail:
void RunModeException(struct pt_regs *regs)
{
- _exception(SIGTRAP, regs, 0, 0);
+ _exception(SIGTRAP, regs, TRAP_FIXME, 0);
}
void single_step_exception(struct pt_regs *regs)
@@ -978,7 +1019,7 @@ static void emulate_single_step(struct pt_regs *regs)
static inline int __parse_fpscr(unsigned long fpscr)
{
- int ret = 0;
+ int ret = FPE_FIXME;
/* Invalid operation */
if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
@@ -1564,7 +1605,7 @@ void facility_unavailable_exception(struct pt_regs *regs)
u8 status;
bool hv;
- hv = (regs->trap == 0xf80);
+ hv = (TRAP(regs) == 0xf80);
if (hv)
value = mfspr(SPRN_HFSCR);
else
@@ -1750,34 +1791,34 @@ static void handle_debug(struct pt_regs *regs, unsigned long debug_status)
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
current->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE;
#endif
- do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT,
+ do_send_trap(regs, mfspr(SPRN_DAC1), debug_status,
5);
changed |= 0x01;
} else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) {
dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W);
- do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT,
+ do_send_trap(regs, mfspr(SPRN_DAC2), debug_status,
6);
changed |= 0x01;
} else if (debug_status & DBSR_IAC1) {
current->thread.debug.dbcr0 &= ~DBCR0_IAC1;
dbcr_iac_range(current) &= ~DBCR_IAC12MODE;
- do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT,
+ do_send_trap(regs, mfspr(SPRN_IAC1), debug_status,
1);
changed |= 0x01;
} else if (debug_status & DBSR_IAC2) {
current->thread.debug.dbcr0 &= ~DBCR0_IAC2;
- do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT,
+ do_send_trap(regs, mfspr(SPRN_IAC2), debug_status,
2);
changed |= 0x01;
} else if (debug_status & DBSR_IAC3) {
current->thread.debug.dbcr0 &= ~DBCR0_IAC3;
dbcr_iac_range(current) &= ~DBCR_IAC34MODE;
- do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT,
+ do_send_trap(regs, mfspr(SPRN_IAC3), debug_status,
3);
changed |= 0x01;
} else if (debug_status & DBSR_IAC4) {
current->thread.debug.dbcr0 &= ~DBCR0_IAC4;
- do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT,
+ do_send_trap(regs, mfspr(SPRN_IAC4), debug_status,
4);
changed |= 0x01;
}
@@ -1929,7 +1970,7 @@ void SPEFloatingPointException(struct pt_regs *regs)
extern int do_spe_mathemu(struct pt_regs *regs);
unsigned long spefscr;
int fpexc_mode;
- int code = 0;
+ int code = FPE_FIXME;
int err;
flush_spe_to_thread(current);
@@ -1998,7 +2039,7 @@ void SPEFloatingPointRoundException(struct pt_regs *regs)
printk(KERN_ERR "unrecognized spe instruction "
"in %s at %lx\n", current->comm, regs->nip);
} else {
- _exception(SIGFPE, regs, 0, regs->nip);
+ _exception(SIGFPE, regs, FPE_FIXME, regs->nip);
return;
}
}
@@ -2113,13 +2154,13 @@ static int __init ppc_warn_emulated_init(void)
if (!dir)
return -ENOMEM;
- d = debugfs_create_u32("do_warn", S_IRUGO | S_IWUSR, dir,
+ d = debugfs_create_u32("do_warn", 0644, dir,
&ppc_warn_emulated);
if (!d)
goto fail;
for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) {
- d = debugfs_create_u32(entries[i].name, S_IRUGO | S_IWUSR, dir,
+ d = debugfs_create_u32(entries[i].name, 0644, dir,
(u32 *)&entries[i].val.counter);
if (!d)
goto fail;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.