Merge branch 'parisc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:

 - Make the powerpc implementation to read elf files available as a
   public kexec interface so it can be re-used on other architectures
   (Sven)

 - Implement kexec on parisc (Sven)

 - Add kprobes on ftrace on parisc (Sven)

 - Fix kernel crash with HSC-PCI cards based on card-mode Dino

 - Add assembly implementations for memset, strlen, strcpy, strncpy and
   strcat

 - Some cleanups, documentation updates, warning fixes, ...

* 'parisc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (25 commits)
  parisc: Have git ignore generated real2.S and firmware.c
  parisc: Disable HP HSC-PCI Cards to prevent kernel crash
  parisc: add support for kexec_file_load() syscall
  parisc: wire up kexec_file_load syscall
  parisc: add kexec syscall support
  parisc: add __pdc_cpu_rendezvous()
  kprobes/parisc: remove arch_kprobe_on_func_entry()
  kexec_elf: support 32 bit ELF files
  kexec_elf: remove unused variable in kexec_elf_load()
  kexec_elf: remove Elf_Rel macro
  kexec_elf: remove PURGATORY_STACK_SIZE
  kexec_elf: remove parsing of section headers
  kexec_elf: change order of elf_*_to_cpu() functions
  kexec: add KEXEC_ELF
  parisc: Save some bytes in dino driver
  parisc: Drop comments which are already in pci.h
  parisc: Convert eisa_enumerator to use pr_cont()
  parisc: Avoid warning when loading hppb driver
  parisc: speed up flush_tlb_all_local with qemu
  parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU
  ...

1 files changed, 60 insertions, 4 deletions

diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index b6fb30f2e4bf..b836fc61a24f 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -13,6 +13,8 @@
 #include <linux/init.h>
 #include <linux/ftrace.h>
 #include <linux/uaccess.h>
+#include <linux/kprobes.h>
+#include <linux/ptrace.h>
 
 #include <asm/assembly.h>
 #include <asm/sections.h>
@@ -48,17 +50,22 @@ static void __hot prepare_ftrace_return(unsigned long *parent,
 
 void notrace __hot ftrace_function_trampoline(unsigned long parent,
 				unsigned long self_addr,
-				unsigned long org_sp_gr3)
+				unsigned long org_sp_gr3,
+				struct pt_regs *regs)
 {
 #ifndef CONFIG_DYNAMIC_FTRACE
 	extern ftrace_func_t ftrace_trace_function;
 #endif
-	if (ftrace_trace_function != ftrace_stub)
-		ftrace_trace_function(self_addr, parent, NULL, NULL);
+	extern struct ftrace_ops *function_trace_op;
+
+	if (function_trace_op->flags & FTRACE_OPS_FL_ENABLED &&
+	    ftrace_trace_function != ftrace_stub)
+		ftrace_trace_function(self_addr, parent,
+				function_trace_op, regs);
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	if (ftrace_graph_return != (trace_func_graph_ret_t) ftrace_stub ||
-		ftrace_graph_entry != ftrace_graph_entry_stub) {
+	    ftrace_graph_entry != ftrace_graph_entry_stub) {
 		unsigned long *parent_rp;
 
 		/* calculate pointer to %rp in stack */
@@ -96,6 +103,12 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
 	return 0;
 }
 
+int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
+			unsigned long addr)
+{
+	return 0;
+}
+
 unsigned long ftrace_call_adjust(unsigned long addr)
 {
 	return addr+(FTRACE_PATCHABLE_FUNCTION_SIZE-1)*4;
@@ -187,3 +200,46 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
 	return 0;
 }
 #endif
+
+#ifdef CONFIG_KPROBES_ON_FTRACE
+void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
+			   struct ftrace_ops *ops, struct pt_regs *regs)
+{
+	struct kprobe_ctlblk *kcb;
+	struct kprobe *p = get_kprobe((kprobe_opcode_t *)ip);
+
+	if (unlikely(!p) || kprobe_disabled(p))
+		return;
+
+	if (kprobe_running()) {
+		kprobes_inc_nmissed_count(p);
+		return;
+	}
+
+	__this_cpu_write(current_kprobe, p);
+
+	kcb = get_kprobe_ctlblk();
+	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+	regs->iaoq[0] = ip;
+	regs->iaoq[1] = ip + 4;
+
+	if (!p->pre_handler || !p->pre_handler(p, regs)) {
+		regs->iaoq[0] = ip + 4;
+		regs->iaoq[1] = ip + 8;
+
+		if (unlikely(p->post_handler)) {
+			kcb->kprobe_status = KPROBE_HIT_SSDONE;
+			p->post_handler(p, regs, 0);
+		}
+	}
+	__this_cpu_write(current_kprobe, NULL);
+}
+NOKPROBE_SYMBOL(kprobe_ftrace_handler);
+
+int arch_prepare_kprobe_ftrace(struct kprobe *p)
+{
+	p->ainsn.insn = NULL;
+	return 0;
+}
+#endif