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-rw-r--r--arch/arc/kernel/perf_event.c73
-rw-r--r--arch/arc/kernel/process.c11
-rw-r--r--arch/arc/kernel/setup.c5
-rw-r--r--arch/arc/kernel/signal.c38
-rw-r--r--arch/arc/kernel/traps.c4
-rw-r--r--arch/arc/kernel/troubleshoot.c3
-rw-r--r--arch/arc/kernel/unwind.c2
7 files changed, 90 insertions, 46 deletions
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index ae1c485cbc68..fd2ec50102f2 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -16,6 +16,7 @@
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <asm/arcregs.h>
+#include <asm/stacktrace.h>
struct arc_pmu {
struct pmu pmu;
@@ -25,6 +26,46 @@ struct arc_pmu {
int ev_hw_idx[PERF_COUNT_ARC_HW_MAX];
};
+struct arc_callchain_trace {
+ int depth;
+ void *perf_stuff;
+};
+
+static int callchain_trace(unsigned int addr, void *data)
+{
+ struct arc_callchain_trace *ctrl = data;
+ struct perf_callchain_entry *entry = ctrl->perf_stuff;
+ perf_callchain_store(entry, addr);
+
+ if (ctrl->depth++ < 3)
+ return 0;
+
+ return -1;
+}
+
+void
+perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
+{
+ struct arc_callchain_trace ctrl = {
+ .depth = 0,
+ .perf_stuff = entry,
+ };
+
+ arc_unwind_core(NULL, regs, callchain_trace, &ctrl);
+}
+
+void
+perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
+{
+ /*
+ * User stack can't be unwound trivially with kernel dwarf unwinder
+ * So for now just record the user PC
+ */
+ perf_callchain_store(entry, instruction_pointer(regs));
+}
+
+static struct arc_pmu *arc_pmu;
+
/* read counter #idx; note that counter# != event# on ARC! */
static uint64_t arc_pmu_read_counter(int idx)
{
@@ -47,7 +88,6 @@ static uint64_t arc_pmu_read_counter(int idx)
static void arc_perf_event_update(struct perf_event *event,
struct hw_perf_event *hwc, int idx)
{
- struct arc_pmu *arc_pmu = container_of(event->pmu, struct arc_pmu, pmu);
uint64_t prev_raw_count, new_raw_count;
int64_t delta;
@@ -89,13 +129,16 @@ static int arc_pmu_cache_event(u64 config)
if (ret == CACHE_OP_UNSUPPORTED)
return -ENOENT;
+ pr_debug("init cache event: type/op/result %d/%d/%d with h/w %d \'%s\'\n",
+ cache_type, cache_op, cache_result, ret,
+ arc_pmu_ev_hw_map[ret]);
+
return ret;
}
/* initializes hw_perf_event structure if event is supported */
static int arc_pmu_event_init(struct perf_event *event)
{
- struct arc_pmu *arc_pmu = container_of(event->pmu, struct arc_pmu, pmu);
struct hw_perf_event *hwc = &event->hw;
int ret;
@@ -106,8 +149,9 @@ static int arc_pmu_event_init(struct perf_event *event)
if (arc_pmu->ev_hw_idx[event->attr.config] < 0)
return -ENOENT;
hwc->config = arc_pmu->ev_hw_idx[event->attr.config];
- pr_debug("initializing event %d with cfg %d\n",
- (int) event->attr.config, (int) hwc->config);
+ pr_debug("init event %d with h/w %d \'%s\'\n",
+ (int) event->attr.config, (int) hwc->config,
+ arc_pmu_ev_hw_map[event->attr.config]);
return 0;
case PERF_TYPE_HW_CACHE:
ret = arc_pmu_cache_event(event->attr.config);
@@ -183,8 +227,6 @@ static void arc_pmu_stop(struct perf_event *event, int flags)
static void arc_pmu_del(struct perf_event *event, int flags)
{
- struct arc_pmu *arc_pmu = container_of(event->pmu, struct arc_pmu, pmu);
-
arc_pmu_stop(event, PERF_EF_UPDATE);
__clear_bit(event->hw.idx, arc_pmu->used_mask);
@@ -194,7 +236,6 @@ static void arc_pmu_del(struct perf_event *event, int flags)
/* allocate hardware counter and optionally start counting */
static int arc_pmu_add(struct perf_event *event, int flags)
{
- struct arc_pmu *arc_pmu = container_of(event->pmu, struct arc_pmu, pmu);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
@@ -247,10 +288,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
BUG_ON(pct_bcr.c > ARC_PMU_MAX_HWEVENTS);
READ_BCR(ARC_REG_CC_BUILD, cc_bcr);
- if (!cc_bcr.v) {
- pr_err("Performance counters exist, but no countable conditions?\n");
- return -ENODEV;
- }
+ BUG_ON(!cc_bcr.v); /* Counters exist but No countable conditions ? */
arc_pmu = devm_kzalloc(&pdev->dev, sizeof(struct arc_pmu), GFP_KERNEL);
if (!arc_pmu)
@@ -263,19 +301,22 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
arc_pmu->n_counters, arc_pmu->counter_size, cc_bcr.c);
cc_name.str[8] = 0;
- for (i = 0; i < PERF_COUNT_HW_MAX; i++)
+ for (i = 0; i < PERF_COUNT_ARC_HW_MAX; i++)
arc_pmu->ev_hw_idx[i] = -1;
+ /* loop thru all available h/w condition indexes */
for (j = 0; j < cc_bcr.c; j++) {
write_aux_reg(ARC_REG_CC_INDEX, j);
cc_name.indiv.word0 = read_aux_reg(ARC_REG_CC_NAME0);
cc_name.indiv.word1 = read_aux_reg(ARC_REG_CC_NAME1);
+
+ /* See if it has been mapped to a perf event_id */
for (i = 0; i < ARRAY_SIZE(arc_pmu_ev_hw_map); i++) {
if (arc_pmu_ev_hw_map[i] &&
!strcmp(arc_pmu_ev_hw_map[i], cc_name.str) &&
strlen(arc_pmu_ev_hw_map[i])) {
- pr_debug("mapping %d to idx %d with name %s\n",
- i, j, cc_name.str);
+ pr_debug("mapping perf event %2d to h/w event \'%8s\' (idx %d)\n",
+ i, cc_name.str, j);
arc_pmu->ev_hw_idx[i] = j;
}
}
@@ -302,7 +343,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
#ifdef CONFIG_OF
static const struct of_device_id arc_pmu_match[] = {
- { .compatible = "snps,arc700-pmu" },
+ { .compatible = "snps,arc700-pct" },
{},
};
MODULE_DEVICE_TABLE(of, arc_pmu_match);
@@ -310,7 +351,7 @@ MODULE_DEVICE_TABLE(of, arc_pmu_match);
static struct platform_driver arc_pmu_driver = {
.driver = {
- .name = "arc700-pmu",
+ .name = "arc700-pct",
.of_match_table = of_match_ptr(arc_pmu_match),
},
.probe = arc_pmu_device_probe,
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 98c00a2d4dd9..e095c557afdd 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -49,7 +49,10 @@ void arch_cpu_idle(void)
asmlinkage void ret_from_fork(void);
-/* Layout of Child kernel mode stack as setup at the end of this function is
+/*
+ * Copy architecture-specific thread state
+ *
+ * Layout of Child kernel mode stack as setup at the end of this function is
*
* | ... |
* | ... |
@@ -81,7 +84,7 @@ asmlinkage void ret_from_fork(void);
* ------------------ <===== END of PAGE
*/
int copy_thread(unsigned long clone_flags,
- unsigned long usp, unsigned long arg,
+ unsigned long usp, unsigned long kthread_arg,
struct task_struct *p)
{
struct pt_regs *c_regs; /* child's pt_regs */
@@ -112,7 +115,7 @@ int copy_thread(unsigned long clone_flags,
if (unlikely(p->flags & PF_KTHREAD)) {
memset(c_regs, 0, sizeof(struct pt_regs));
- c_callee->r13 = arg; /* argument to kernel thread */
+ c_callee->r13 = kthread_arg;
c_callee->r14 = usp; /* function */
return 0;
@@ -155,8 +158,6 @@ int copy_thread(unsigned long clone_flags,
*/
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp)
{
- set_fs(USER_DS); /* user space */
-
regs->sp = usp;
regs->ret = pc;
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 900f68a70088..1d167c6df8ca 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -120,7 +120,10 @@ static void read_arc_build_cfg_regs(void)
READ_BCR(ARC_REG_SMART_BCR, bcr);
cpu->extn.smart = bcr.ver ? 1 : 0;
- cpu->extn.debug = cpu->extn.ap | cpu->extn.smart;
+ READ_BCR(ARC_REG_RTT_BCR, bcr);
+ cpu->extn.rtt = bcr.ver ? 1 : 0;
+
+ cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
}
static const struct cpuinfo_data arc_cpu_tbl[] = {
diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 114234e83caa..2251fb4bbfd7 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -67,7 +67,7 @@ stash_usr_regs(struct rt_sigframe __user *sf, struct pt_regs *regs,
sigset_t *set)
{
int err;
- err = __copy_to_user(&(sf->uc.uc_mcontext.regs), regs,
+ err = __copy_to_user(&(sf->uc.uc_mcontext.regs.scratch), regs,
sizeof(sf->uc.uc_mcontext.regs.scratch));
err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t));
@@ -83,7 +83,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
if (!err)
set_current_blocked(&set);
- err |= __copy_from_user(regs, &(sf->uc.uc_mcontext.regs),
+ err |= __copy_from_user(regs, &(sf->uc.uc_mcontext.regs.scratch),
sizeof(sf->uc.uc_mcontext.regs.scratch));
return err;
@@ -131,6 +131,15 @@ SYSCALL_DEFINE0(rt_sigreturn)
/* Don't restart from sigreturn */
syscall_wont_restart(regs);
+ /*
+ * Ensure that sigreturn always returns to user mode (in case the
+ * regs saved on user stack got fudged between save and sigreturn)
+ * Otherwise it is easy to panic the kernel with a custom
+ * signal handler and/or restorer which clobberes the status32/ret
+ * to return to a bogus location in kernel mode.
+ */
+ regs->status32 |= STATUS_U_MASK;
+
return regs->r0;
badframe:
@@ -162,18 +171,6 @@ static inline void __user *get_sigframe(struct ksignal *ksig,
return frame;
}
-/*
- * translate the signal
- */
-static inline int map_sig(int sig)
-{
- struct thread_info *thread = current_thread_info();
- if (thread->exec_domain && thread->exec_domain->signal_invmap
- && sig < 32)
- sig = thread->exec_domain->signal_invmap[sig];
- return sig;
-}
-
static int
setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
{
@@ -222,15 +219,18 @@ setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
return err;
/* #1 arg to the user Signal handler */
- regs->r0 = map_sig(ksig->sig);
+ regs->r0 = ksig->sig;
/* setup PC of user space signal handler */
regs->ret = (unsigned long)ksig->ka.sa.sa_handler;
/*
* handler returns using sigreturn stub provided already by userpsace
+ * If not, nuke the process right away
*/
- BUG_ON(!(ksig->ka.sa.sa_flags & SA_RESTORER));
+ if(!(ksig->ka.sa.sa_flags & SA_RESTORER))
+ return 1;
+
regs->blink = (unsigned long)ksig->ka.sa.sa_restorer;
/* User Stack for signal handler will be above the frame just carved */
@@ -296,12 +296,12 @@ static void
handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
- int ret;
+ int failed;
/* Set up the stack frame */
- ret = setup_rt_frame(ksig, oldset, regs);
+ failed = setup_rt_frame(ksig, oldset, regs);
- signal_setup_done(ret, ksig, 0);
+ signal_setup_done(failed, ksig, 0);
}
void do_signal(struct pt_regs *regs)
diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 3eadfdabc322..c927aa84e652 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -42,7 +42,7 @@ void die(const char *str, struct pt_regs *regs, unsigned long address)
* -for kernel, chk if due to copy_(to|from)_user, otherwise die()
*/
static noinline int
-handle_exception(const char *str, struct pt_regs *regs, siginfo_t *info)
+unhandled_exception(const char *str, struct pt_regs *regs, siginfo_t *info)
{
if (user_mode(regs)) {
struct task_struct *tsk = current;
@@ -71,7 +71,7 @@ int name(unsigned long address, struct pt_regs *regs) \
.si_code = sicode, \
.si_addr = (void __user *)address, \
}; \
- return handle_exception(str, regs, &info);\
+ return unhandled_exception(str, regs, &info);\
}
/*
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index 1badf9b84b51..e00a01879025 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -52,7 +52,7 @@ static void show_callee_regs(struct callee_regs *cregs)
print_reg_file(&(cregs->r13), 13);
}
-void print_task_path_n_nm(struct task_struct *tsk, char *buf)
+static void print_task_path_n_nm(struct task_struct *tsk, char *buf)
{
struct path path;
char *path_nm = NULL;
@@ -77,7 +77,6 @@ void print_task_path_n_nm(struct task_struct *tsk, char *buf)
done:
pr_info("Path: %s\n", path_nm);
}
-EXPORT_SYMBOL(print_task_path_n_nm);
static void show_faulting_vma(unsigned long address, char *buf)
{
diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index e550b117ec4f..93c6ea52b671 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -841,7 +841,7 @@ static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc,
break;
case DW_CFA_GNU_window_save:
default:
- unw_debug("UNKNOW OPCODE 0x%x\n", opcode);
+ unw_debug("UNKNOWN OPCODE 0x%x\n", opcode);
result = 0;
break;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.