sparc64: add ftrace support.
Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
David Miller
Thomas Gleixner
parent
aa5e5ceaf5
commit
d05f5f9906
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@ -11,6 +11,7 @@ config SPARC
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config SPARC64
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bool
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default y
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select HAVE_FTRACE
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select HAVE_IDE
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select HAVE_LMB
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select HAVE_ARCH_KGDB
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@ -33,7 +33,7 @@ config DEBUG_PAGEALLOC
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config MCOUNT
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bool
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depends on STACK_DEBUG
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depends on STACK_DEBUG || FTRACE
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default y
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config FRAME_POINTER
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@ -14,6 +14,7 @@ obj-y := process.o setup.o cpu.o idprom.o \
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power.o sbus.o sparc64_ksyms.o chmc.o \
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visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_PCI) += ebus.o pci_common.o \
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pci_psycho.o pci_sabre.o pci_schizo.o \
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@ -0,0 +1,99 @@
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#include <linux/spinlock.h>
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#include <linux/hardirq.h>
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#include <linux/ftrace.h>
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#include <linux/percpu.h>
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#include <linux/init.h>
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#include <linux/list.h>
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static const u32 ftrace_nop = 0x01000000;
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notrace int ftrace_ip_converted(unsigned long ip)
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{
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u32 insn = *(u32 *) ip;
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return (insn == ftrace_nop);
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}
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notrace unsigned char *ftrace_nop_replace(void)
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{
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return (char *)&ftrace_nop;
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}
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notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
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{
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static u32 call;
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s32 off;
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off = ((s32)addr - (s32)ip);
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call = 0x40000000 | ((u32)off >> 2);
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return (unsigned char *) &call;
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}
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notrace int
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ftrace_modify_code(unsigned long ip, unsigned char *old_code,
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unsigned char *new_code)
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{
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u32 old = *(u32 *)old_code;
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u32 new = *(u32 *)new_code;
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u32 replaced;
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int faulted;
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__asm__ __volatile__(
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"1: cas [%[ip]], %[old], %[new]\n"
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" flush %[ip]\n"
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" mov 0, %[faulted]\n"
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"2:\n"
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" .section .fixup,#alloc,#execinstr\n"
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" .align 4\n"
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"3: sethi %%hi(2b), %[faulted]\n"
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" jmpl %[faulted] + %%lo(2b), %%g0\n"
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" mov 1, %[faulted]\n"
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" .previous\n"
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" .section __ex_table,\"a\"\n"
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" .align 4\n"
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" .word 1b, 3b\n"
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" .previous\n"
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: "=r" (replaced), [faulted] "=r" (faulted)
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: [new] "0" (new), [old] "r" (old), [ip] "r" (ip)
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: "memory");
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if (replaced != old && replaced != new)
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faulted = 2;
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return faulted;
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}
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notrace int ftrace_update_ftrace_func(ftrace_func_t func)
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{
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unsigned long ip = (unsigned long)(&ftrace_call);
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unsigned char old[4], *new;
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memcpy(old, &ftrace_call, 4);
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new = ftrace_call_replace(ip, (unsigned long)func);
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return ftrace_modify_code(ip, old, new);
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}
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notrace int ftrace_mcount_set(unsigned long *data)
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{
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unsigned long ip = (long)(&mcount_call);
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unsigned long *addr = data;
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unsigned char old[4], *new;
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/*
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* Replace the mcount stub with a pointer to the
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* ip recorder function.
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*/
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memcpy(old, &mcount_call, 4);
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new = ftrace_call_replace(ip, *addr);
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*addr = ftrace_modify_code(ip, old, new);
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return 0;
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}
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int __init ftrace_dyn_arch_init(void *data)
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{
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ftrace_mcount_set(data);
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return 0;
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}
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@ -28,10 +28,13 @@ ovstack:
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.skip OVSTACKSIZE
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#endif
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.text
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.align 32
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.globl mcount, _mcount
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mcount:
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.align 32
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.globl _mcount
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.type _mcount,#function
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.globl mcount
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.type mcount,#function
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_mcount:
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mcount:
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#ifdef CONFIG_STACK_DEBUG
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/*
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* Check whether %sp is dangerously low.
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@ -55,6 +58,53 @@ _mcount:
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or %g3, %lo(panicstring), %o0
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call prom_halt
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nop
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1:
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#endif
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1: retl
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#ifdef CONFIG_FTRACE
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#ifdef CONFIG_DYNAMIC_FTRACE
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mov %o7, %o0
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.globl mcount_call
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mcount_call:
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call ftrace_stub
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mov %o0, %o7
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#else
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sethi %hi(ftrace_trace_function), %g1
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sethi %hi(ftrace_stub), %g2
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ldx [%g1 + %lo(ftrace_trace_function)], %g1
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or %g2, %lo(ftrace_stub), %g2
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cmp %g1, %g2
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be,pn %icc, 1f
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mov %i7, %o1
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jmpl %g1, %g0
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mov %o7, %o0
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/* not reached */
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1:
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#endif
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#endif
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retl
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nop
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.size _mcount,.-_mcount
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.size mcount,.-mcount
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#ifdef CONFIG_FTRACE
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.globl ftrace_stub
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.type ftrace_stub,#function
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ftrace_stub:
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retl
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nop
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.size ftrace_stub,.-ftrace_stub
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#ifdef CONFIG_DYNAMIC_FTRACE
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.globl ftrace_caller
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.type ftrace_caller,#function
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ftrace_caller:
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mov %i7, %o1
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mov %o7, %o0
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.globl ftrace_call
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ftrace_call:
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call ftrace_stub
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mov %o0, %o7
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retl
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nop
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.size ftrace_caller,.-ftrace_caller
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#endif
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#endif
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