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-rw-r--r--arch/sparc64/Kconfig2
-rw-r--r--arch/sparc64/Kconfig.debug2
-rw-r--r--arch/sparc64/kernel/Makefile1
-rw-r--r--arch/sparc64/kernel/ftrace.c94
-rw-r--r--arch/sparc64/kernel/sparc64_ksyms.c4
-rw-r--r--arch/sparc64/kernel/stacktrace.c2
-rw-r--r--arch/sparc64/kernel/time.c7
-rw-r--r--arch/sparc64/lib/mcount.S58
8 files changed, 162 insertions, 8 deletions
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index eb36f3b746b..fca9246470b 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -11,6 +11,8 @@ config SPARC
config SPARC64
bool
default y
+ select HAVE_DYNAMIC_FTRACE
+ select HAVE_FTRACE
select HAVE_IDE
select HAVE_LMB
select HAVE_ARCH_KGDB
diff --git a/arch/sparc64/Kconfig.debug b/arch/sparc64/Kconfig.debug
index 6a4d28a4076..d6d32d178fc 100644
--- a/arch/sparc64/Kconfig.debug
+++ b/arch/sparc64/Kconfig.debug
@@ -33,7 +33,7 @@ config DEBUG_PAGEALLOC
config MCOUNT
bool
- depends on STACK_DEBUG
+ depends on STACK_DEBUG || FTRACE
default y
config FRAME_POINTER
diff --git a/arch/sparc64/kernel/Makefile b/arch/sparc64/kernel/Makefile
index ec4f5ebb1ca..418b5782096 100644
--- a/arch/sparc64/kernel/Makefile
+++ b/arch/sparc64/kernel/Makefile
@@ -14,6 +14,7 @@ obj-y := process.o setup.o cpu.o idprom.o \
power.o sbus.o sparc64_ksyms.o chmc.o \
visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o
+obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_PCI) += ebus.o pci_common.o \
pci_psycho.o pci_sabre.o pci_schizo.o \
diff --git a/arch/sparc64/kernel/ftrace.c b/arch/sparc64/kernel/ftrace.c
new file mode 100644
index 00000000000..4298d0aee71
--- /dev/null
+++ b/arch/sparc64/kernel/ftrace.c
@@ -0,0 +1,94 @@
+#include <linux/spinlock.h>
+#include <linux/hardirq.h>
+#include <linux/ftrace.h>
+#include <linux/percpu.h>
+#include <linux/init.h>
+#include <linux/list.h>
+
+#include <asm/ftrace.h>
+
+static const u32 ftrace_nop = 0x01000000;
+
+notrace unsigned char *ftrace_nop_replace(void)
+{
+ return (char *)&ftrace_nop;
+}
+
+notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
+{
+ static u32 call;
+ s32 off;
+
+ off = ((s32)addr - (s32)ip);
+ call = 0x40000000 | ((u32)off >> 2);
+
+ return (unsigned char *) &call;
+}
+
+notrace int
+ftrace_modify_code(unsigned long ip, unsigned char *old_code,
+ unsigned char *new_code)
+{
+ u32 old = *(u32 *)old_code;
+ u32 new = *(u32 *)new_code;
+ u32 replaced;
+ int faulted;
+
+ __asm__ __volatile__(
+ "1: cas [%[ip]], %[old], %[new]\n"
+ " flush %[ip]\n"
+ " mov 0, %[faulted]\n"
+ "2:\n"
+ " .section .fixup,#alloc,#execinstr\n"
+ " .align 4\n"
+ "3: sethi %%hi(2b), %[faulted]\n"
+ " jmpl %[faulted] + %%lo(2b), %%g0\n"
+ " mov 1, %[faulted]\n"
+ " .previous\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .word 1b, 3b\n"
+ " .previous\n"
+ : "=r" (replaced), [faulted] "=r" (faulted)
+ : [new] "0" (new), [old] "r" (old), [ip] "r" (ip)
+ : "memory");
+
+ if (replaced != old && replaced != new)
+ faulted = 2;
+
+ return faulted;
+}
+
+notrace int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+ unsigned long ip = (unsigned long)(&ftrace_call);
+ unsigned char old[MCOUNT_INSN_SIZE], *new;
+
+ memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE);
+ new = ftrace_call_replace(ip, (unsigned long)func);
+ return ftrace_modify_code(ip, old, new);
+}
+
+notrace int ftrace_mcount_set(unsigned long *data)
+{
+ unsigned long ip = (long)(&mcount_call);
+ unsigned long *addr = data;
+ unsigned char old[MCOUNT_INSN_SIZE], *new;
+
+ /*
+ * Replace the mcount stub with a pointer to the
+ * ip recorder function.
+ */
+ memcpy(old, &mcount_call, MCOUNT_INSN_SIZE);
+ new = ftrace_call_replace(ip, *addr);
+ *addr = ftrace_modify_code(ip, old, new);
+
+ return 0;
+}
+
+
+int __init ftrace_dyn_arch_init(void *data)
+{
+ ftrace_mcount_set(data);
+ return 0;
+}
diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 8ac0b99f2c5..49d3ea50c24 100644
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -53,6 +53,7 @@
#include <asm/ns87303.h>
#include <asm/timer.h>
#include <asm/cpudata.h>
+#include <asm/ftrace.h>
struct poll {
int fd;
@@ -111,8 +112,7 @@ EXPORT_SYMBOL(__write_trylock);
EXPORT_SYMBOL(smp_call_function);
#endif /* CONFIG_SMP */
-#if defined(CONFIG_MCOUNT)
-extern void _mcount(void);
+#ifdef CONFIG_MCOUNT
EXPORT_SYMBOL(_mcount);
#endif
diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index c73ce3f4197..b3e3737750d 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -1,6 +1,7 @@
#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
+#include <linux/module.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>
@@ -47,3 +48,4 @@ void save_stack_trace(struct stack_trace *trace)
trace->entries[trace->nr_entries++] = pc;
} while (trace->nr_entries < trace->max_entries);
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index e5d238970c7..bedc4c159b1 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -11,6 +11,7 @@
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
@@ -1659,10 +1660,14 @@ static int mini_rtc_ioctl(struct inode *inode, struct file *file,
static int mini_rtc_open(struct inode *inode, struct file *file)
{
- if (mini_rtc_status & RTC_IS_OPEN)
+ lock_kernel();
+ if (mini_rtc_status & RTC_IS_OPEN) {
+ unlock_kernel();
return -EBUSY;
+ }
mini_rtc_status |= RTC_IS_OPEN;
+ unlock_kernel();
return 0;
}
diff --git a/arch/sparc64/lib/mcount.S b/arch/sparc64/lib/mcount.S
index 9e4534b485c..7735a7a6053 100644
--- a/arch/sparc64/lib/mcount.S
+++ b/arch/sparc64/lib/mcount.S
@@ -28,10 +28,13 @@ ovstack:
.skip OVSTACKSIZE
#endif
.text
- .align 32
- .globl mcount, _mcount
-mcount:
+ .align 32
+ .globl _mcount
+ .type _mcount,#function
+ .globl mcount
+ .type mcount,#function
_mcount:
+mcount:
#ifdef CONFIG_STACK_DEBUG
/*
* Check whether %sp is dangerously low.
@@ -55,6 +58,53 @@ _mcount:
or %g3, %lo(panicstring), %o0
call prom_halt
nop
+1:
+#endif
+#ifdef CONFIG_FTRACE
+#ifdef CONFIG_DYNAMIC_FTRACE
+ mov %o7, %o0
+ .globl mcount_call
+mcount_call:
+ call ftrace_stub
+ mov %o0, %o7
+#else
+ sethi %hi(ftrace_trace_function), %g1
+ sethi %hi(ftrace_stub), %g2
+ ldx [%g1 + %lo(ftrace_trace_function)], %g1
+ or %g2, %lo(ftrace_stub), %g2
+ cmp %g1, %g2
+ be,pn %icc, 1f
+ mov %i7, %o1
+ jmpl %g1, %g0
+ mov %o7, %o0
+ /* not reached */
+1:
#endif
-1: retl
+#endif
+ retl
nop
+ .size _mcount,.-_mcount
+ .size mcount,.-mcount
+
+#ifdef CONFIG_FTRACE
+ .globl ftrace_stub
+ .type ftrace_stub,#function
+ftrace_stub:
+ retl
+ nop
+ .size ftrace_stub,.-ftrace_stub
+#ifdef CONFIG_DYNAMIC_FTRACE
+ .globl ftrace_caller
+ .type ftrace_caller,#function
+ftrace_caller:
+ mov %i7, %o1
+ mov %o7, %o0
+ .globl ftrace_call
+ftrace_call:
+ call ftrace_stub
+ mov %o0, %o7
+ retl
+ nop
+ .size ftrace_caller,.-ftrace_caller
+#endif
+#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 19:15:05 +0000