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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-01 20:05:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-01 20:05:19 -0700
commit79ef0c00142519bc34e1341447f3797436cc48bf (patch)
tree200c1ada8b4f31b79ec8a67939ca5fbcd0339958 /arch/arc
parentd54f486035fd89f14845a7f34a97a3f5da4e70f2 (diff)
parentfeea69ec121f067073868cebe0cb9d003e64ad80 (diff)
Merge tag 'trace-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: - kprobes: Restructured stack unwinder to show properly on x86 when a stack dump happens from a kretprobe callback. - Fix to bootconfig parsing - Have tracefs allow owner and group permissions by default (only denying others). There's been pressure to allow non root to tracefs in a controlled fashion, and using groups is probably the safest. - Bootconfig memory managament updates. - Bootconfig clean up to have the tools directory be less dependent on changes in the kernel tree. - Allow perf to be traced by function tracer. - Rewrite of function graph tracer to be a callback from the function tracer instead of having its own trampoline (this change will happen on an arch by arch basis, and currently only x86_64 implements it). - Allow multiple direct trampolines (bpf hooks to functions) be batched together in one synchronization. - Allow histogram triggers to add variables that can perform calculations against the event's fields. - Use the linker to determine architecture callbacks from the ftrace trampoline to allow for proper parameter prototypes and prevent warnings from the compiler. - Extend histogram triggers to key off of variables. - Have trace recursion use bit magic to determine preempt context over if branches. - Have trace recursion disable preemption as all use cases do anyway. - Added testing for verification of tracing utilities. - Various small clean ups and fixes. * tag 'trace-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (101 commits) tracing/histogram: Fix semicolon.cocci warnings tracing/histogram: Fix documentation inline emphasis warning tracing: Increase PERF_MAX_TRACE_SIZE to handle Sentinel1 and docker together tracing: Show size of requested perf buffer bootconfig: Initialize ret in xbc_parse_tree() ftrace: do CPU checking after preemption disabled ftrace: disable preemption when recursion locked tracing/histogram: Document expression arithmetic and constants tracing/histogram: Optimize division by a power of 2 tracing/histogram: Covert expr to const if both operands are constants tracing/histogram: Simplify handling of .sym-offset in expressions tracing: Fix operator precedence for hist triggers expression tracing: Add division and multiplication support for hist triggers tracing: Add support for creating hist trigger variables from literal selftests/ftrace: Stop tracing while reading the trace file by default MAINTAINERS: Update KPROBES and TRACING entries test_kprobes: Move it from kernel/ to lib/ docs, kprobes: Remove invalid URL and add new reference samples/kretprobes: Fix return value if register_kretprobe() failed lib/bootconfig: Fix the xbc_get_info kerneldoc ...
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/kprobes.h2
-rw-r--r--arch/arc/include/asm/ptrace.h5
-rw-r--r--arch/arc/kernel/kprobes.c13
3 files changed, 13 insertions, 7 deletions
diff --git a/arch/arc/include/asm/kprobes.h b/arch/arc/include/asm/kprobes.h
index 2134721dce44..de1566e32cb8 100644
--- a/arch/arc/include/asm/kprobes.h
+++ b/arch/arc/include/asm/kprobes.h
@@ -46,7 +46,7 @@ struct kprobe_ctlblk {
};
int kprobe_fault_handler(struct pt_regs *regs, unsigned long cause);
-void kretprobe_trampoline(void);
+void __kretprobe_trampoline(void);
void trap_is_kprobe(unsigned long address, struct pt_regs *regs);
#else
#define trap_is_kprobe(address, regs)
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 4c3c9be5bd16..cca8d6583e31 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -149,6 +149,11 @@ static inline long regs_return_value(struct pt_regs *regs)
return (long)regs->r0;
}
+static inline void instruction_pointer_set(struct pt_regs *regs,
+ unsigned long val)
+{
+ instruction_pointer(regs) = val;
+}
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_PTRACE_H */
diff --git a/arch/arc/kernel/kprobes.c b/arch/arc/kernel/kprobes.c
index 5f0415fc7328..e71d64119d71 100644
--- a/arch/arc/kernel/kprobes.c
+++ b/arch/arc/kernel/kprobes.c
@@ -363,8 +363,9 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
static void __used kretprobe_trampoline_holder(void)
{
- __asm__ __volatile__(".global kretprobe_trampoline\n"
- "kretprobe_trampoline:\n" "nop\n");
+ __asm__ __volatile__(".global __kretprobe_trampoline\n"
+ "__kretprobe_trampoline:\n"
+ "nop\n");
}
void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
@@ -375,13 +376,13 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
ri->fp = NULL;
/* Replace the return addr with trampoline addr */
- regs->blink = (unsigned long)&kretprobe_trampoline;
+ regs->blink = (unsigned long)&__kretprobe_trampoline;
}
static int __kprobes trampoline_probe_handler(struct kprobe *p,
struct pt_regs *regs)
{
- regs->ret = __kretprobe_trampoline_handler(regs, &kretprobe_trampoline, NULL);
+ regs->ret = __kretprobe_trampoline_handler(regs, NULL);
/* By returning a non zero value, we are telling the kprobe handler
* that we don't want the post_handler to run
@@ -390,7 +391,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p,
}
static struct kprobe trampoline_p = {
- .addr = (kprobe_opcode_t *) &kretprobe_trampoline,
+ .addr = (kprobe_opcode_t *) &__kretprobe_trampoline,
.pre_handler = trampoline_probe_handler
};
@@ -402,7 +403,7 @@ int __init arch_init_kprobes(void)
int __kprobes arch_trampoline_kprobe(struct kprobe *p)
{
- if (p->addr == (kprobe_opcode_t *) &kretprobe_trampoline)
+ if (p->addr == (kprobe_opcode_t *) &__kretprobe_trampoline)
return 1;
return 0;