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powerpc/ftrace/64: Split further based on -mprofile-kernel
Split ftrace_64.S further retaining the core ftrace 64-bit aspects in ftrace_64.S and moving ftrace_caller() and ftrace_graph_caller() into separate files based on -mprofile-kernel. The livepatch routines are all now contained within the mprofile file. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
Michael Ellerman
parent
7853f9c029
commit
096ff2ddba
@ -11,6 +11,11 @@ endif
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obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_32.o
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obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_32.o
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obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64.o
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obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64.o
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ifdef CONFIG_MPROFILE_KERNEL
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obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_mprofile.o
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else
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obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_pg.o
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endif
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
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@ -23,233 +23,7 @@ EXPORT_SYMBOL(_mcount)
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mtlr r0
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mtlr r0
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bctr
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bctr
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#ifndef CC_USING_MPROFILE_KERNEL
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#else /* CONFIG_DYNAMIC_FTRACE */
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_GLOBAL_TOC(ftrace_caller)
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/* Taken from output of objdump from lib64/glibc */
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mflr r3
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ld r11, 0(r1)
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stdu r1, -112(r1)
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std r3, 128(r1)
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ld r4, 16(r11)
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subi r3, r3, MCOUNT_INSN_SIZE
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.globl ftrace_call
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ftrace_call:
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bl ftrace_stub
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.globl ftrace_graph_call
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ftrace_graph_call:
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b ftrace_graph_stub
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_GLOBAL(ftrace_graph_stub)
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#endif
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ld r0, 128(r1)
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mtlr r0
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addi r1, r1, 112
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#else /* CC_USING_MPROFILE_KERNEL */
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/*
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*
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* ftrace_caller() is the function that replaces _mcount() when ftrace is
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* active.
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*
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* We arrive here after a function A calls function B, and we are the trace
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* function for B. When we enter r1 points to A's stack frame, B has not yet
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* had a chance to allocate one yet.
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*
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* Additionally r2 may point either to the TOC for A, or B, depending on
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* whether B did a TOC setup sequence before calling us.
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*
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* On entry the LR points back to the _mcount() call site, and r0 holds the
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* saved LR as it was on entry to B, ie. the original return address at the
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* call site in A.
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*
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* Our job is to save the register state into a struct pt_regs (on the stack)
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* and then arrange for the ftrace function to be called.
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*/
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_GLOBAL(ftrace_caller)
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/* Save the original return address in A's stack frame */
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std r0,LRSAVE(r1)
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/* Create our stack frame + pt_regs */
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stdu r1,-SWITCH_FRAME_SIZE(r1)
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/* Save all gprs to pt_regs */
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SAVE_8GPRS(0,r1)
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SAVE_8GPRS(8,r1)
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SAVE_8GPRS(16,r1)
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SAVE_8GPRS(24,r1)
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/* Load special regs for save below */
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mfmsr r8
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mfctr r9
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mfxer r10
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mfcr r11
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/* Get the _mcount() call site out of LR */
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mflr r7
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/* Save it as pt_regs->nip */
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std r7, _NIP(r1)
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/* Save the read LR in pt_regs->link */
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std r0, _LINK(r1)
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/* Save callee's TOC in the ABI compliant location */
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std r2, 24(r1)
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ld r2,PACATOC(r13) /* get kernel TOC in r2 */
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addis r3,r2,function_trace_op@toc@ha
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addi r3,r3,function_trace_op@toc@l
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ld r5,0(r3)
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#ifdef CONFIG_LIVEPATCH
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mr r14,r7 /* remember old NIP */
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#endif
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/* Calculate ip from nip-4 into r3 for call below */
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subi r3, r7, MCOUNT_INSN_SIZE
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/* Put the original return address in r4 as parent_ip */
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mr r4, r0
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/* Save special regs */
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std r8, _MSR(r1)
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std r9, _CTR(r1)
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std r10, _XER(r1)
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std r11, _CCR(r1)
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/* Load &pt_regs in r6 for call below */
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addi r6, r1 ,STACK_FRAME_OVERHEAD
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/* ftrace_call(r3, r4, r5, r6) */
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.globl ftrace_call
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ftrace_call:
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bl ftrace_stub
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nop
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/* Load ctr with the possibly modified NIP */
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ld r3, _NIP(r1)
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mtctr r3
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#ifdef CONFIG_LIVEPATCH
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cmpd r14,r3 /* has NIP been altered? */
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#endif
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/* Restore gprs */
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REST_8GPRS(0,r1)
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REST_8GPRS(8,r1)
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REST_8GPRS(16,r1)
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REST_8GPRS(24,r1)
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/* Restore possibly modified LR */
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ld r0, _LINK(r1)
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mtlr r0
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/* Restore callee's TOC */
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ld r2, 24(r1)
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/* Pop our stack frame */
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addi r1, r1, SWITCH_FRAME_SIZE
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#ifdef CONFIG_LIVEPATCH
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/* Based on the cmpd above, if the NIP was altered handle livepatch */
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bne- livepatch_handler
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#endif
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.globl ftrace_graph_call
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ftrace_graph_call:
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b ftrace_graph_stub
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_GLOBAL(ftrace_graph_stub)
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#endif
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bctr /* jump after _mcount site */
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#endif /* CC_USING_MPROFILE_KERNEL */
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_GLOBAL(ftrace_stub)
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blr
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#ifdef CONFIG_LIVEPATCH
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/*
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* This function runs in the mcount context, between two functions. As
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* such it can only clobber registers which are volatile and used in
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* function linkage.
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*
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* We get here when a function A, calls another function B, but B has
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* been live patched with a new function C.
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*
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* On entry:
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* - we have no stack frame and can not allocate one
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* - LR points back to the original caller (in A)
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* - CTR holds the new NIP in C
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* - r0 & r12 are free
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*
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* r0 can't be used as the base register for a DS-form load or store, so
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* we temporarily shuffle r1 (stack pointer) into r0 and then put it back.
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*/
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livepatch_handler:
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CURRENT_THREAD_INFO(r12, r1)
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/* Save stack pointer into r0 */
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mr r0, r1
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/* Allocate 3 x 8 bytes */
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ld r1, TI_livepatch_sp(r12)
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addi r1, r1, 24
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std r1, TI_livepatch_sp(r12)
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/* Save toc & real LR on livepatch stack */
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std r2, -24(r1)
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mflr r12
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std r12, -16(r1)
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/* Store stack end marker */
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lis r12, STACK_END_MAGIC@h
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ori r12, r12, STACK_END_MAGIC@l
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std r12, -8(r1)
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/* Restore real stack pointer */
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mr r1, r0
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/* Put ctr in r12 for global entry and branch there */
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mfctr r12
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bctrl
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/*
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* Now we are returning from the patched function to the original
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* caller A. We are free to use r0 and r12, and we can use r2 until we
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* restore it.
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*/
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CURRENT_THREAD_INFO(r12, r1)
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/* Save stack pointer into r0 */
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mr r0, r1
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ld r1, TI_livepatch_sp(r12)
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/* Check stack marker hasn't been trashed */
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lis r2, STACK_END_MAGIC@h
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ori r2, r2, STACK_END_MAGIC@l
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ld r12, -8(r1)
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1: tdne r12, r2
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EMIT_BUG_ENTRY 1b, __FILE__, __LINE__ - 1, 0
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/* Restore LR & toc from livepatch stack */
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ld r12, -16(r1)
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mtlr r12
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ld r2, -24(r1)
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/* Pop livepatch stack frame */
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CURRENT_THREAD_INFO(r12, r0)
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subi r1, r1, 24
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std r1, TI_livepatch_sp(r12)
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/* Restore real stack pointer */
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mr r1, r0
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/* Return to original caller of live patched function */
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blr
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#endif
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#else
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_GLOBAL_TOC(_mcount)
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_GLOBAL_TOC(_mcount)
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EXPORT_SYMBOL(_mcount)
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EXPORT_SYMBOL(_mcount)
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/* Taken from output of objdump from lib64/glibc */
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/* Taken from output of objdump from lib64/glibc */
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@ -267,7 +41,6 @@ EXPORT_SYMBOL(_mcount)
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bctrl
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bctrl
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nop
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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b ftrace_graph_caller
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b ftrace_graph_caller
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#endif
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#endif
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@ -276,86 +49,9 @@ EXPORT_SYMBOL(_mcount)
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addi r1, r1, 112
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addi r1, r1, 112
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_GLOBAL(ftrace_stub)
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_GLOBAL(ftrace_stub)
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blr
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blr
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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#ifndef CC_USING_MPROFILE_KERNEL
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_GLOBAL(ftrace_graph_caller)
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/* load r4 with local address */
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ld r4, 128(r1)
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subi r4, r4, MCOUNT_INSN_SIZE
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/* Grab the LR out of the caller stack frame */
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ld r11, 112(r1)
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ld r3, 16(r11)
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bl prepare_ftrace_return
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nop
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/*
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* prepare_ftrace_return gives us the address we divert to.
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* Change the LR in the callers stack frame to this.
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*/
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ld r11, 112(r1)
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std r3, 16(r11)
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ld r0, 128(r1)
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mtlr r0
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addi r1, r1, 112
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blr
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#else /* CC_USING_MPROFILE_KERNEL */
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_GLOBAL(ftrace_graph_caller)
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stdu r1, -112(r1)
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/* with -mprofile-kernel, parameter regs are still alive at _mcount */
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std r10, 104(r1)
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std r9, 96(r1)
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std r8, 88(r1)
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std r7, 80(r1)
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std r6, 72(r1)
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std r5, 64(r1)
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std r4, 56(r1)
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std r3, 48(r1)
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/* Save callee's TOC in the ABI compliant location */
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std r2, 24(r1)
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ld r2, PACATOC(r13) /* get kernel TOC in r2 */
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mfctr r4 /* ftrace_caller has moved local addr here */
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std r4, 40(r1)
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mflr r3 /* ftrace_caller has restored LR from stack */
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subi r4, r4, MCOUNT_INSN_SIZE
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bl prepare_ftrace_return
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nop
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/*
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* prepare_ftrace_return gives us the address we divert to.
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* Change the LR to this.
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*/
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mtlr r3
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ld r0, 40(r1)
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mtctr r0
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ld r10, 104(r1)
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ld r9, 96(r1)
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ld r8, 88(r1)
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ld r7, 80(r1)
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ld r6, 72(r1)
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ld r5, 64(r1)
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ld r4, 56(r1)
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ld r3, 48(r1)
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/* Restore callee's TOC */
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ld r2, 24(r1)
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addi r1, r1, 112
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mflr r0
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std r0, LRSAVE(r1)
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bctr
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#endif /* CC_USING_MPROFILE_KERNEL */
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_GLOBAL(return_to_handler)
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_GLOBAL(return_to_handler)
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/* need to save return values */
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/* need to save return values */
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std r4, -32(r1)
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std r4, -32(r1)
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272
arch/powerpc/kernel/trace/ftrace_64_mprofile.S
Normal file
272
arch/powerpc/kernel/trace/ftrace_64_mprofile.S
Normal file
@ -0,0 +1,272 @@
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/*
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* Split from ftrace_64.S
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/magic.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/ftrace.h>
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#include <asm/ppc-opcode.h>
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#include <asm/export.h>
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#include <asm/thread_info.h>
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#include <asm/bug.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_DYNAMIC_FTRACE
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/*
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*
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* ftrace_caller() is the function that replaces _mcount() when ftrace is
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* active.
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*
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* We arrive here after a function A calls function B, and we are the trace
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|
* function for B. When we enter r1 points to A's stack frame, B has not yet
|
||||||
|
* had a chance to allocate one yet.
|
||||||
|
*
|
||||||
|
* Additionally r2 may point either to the TOC for A, or B, depending on
|
||||||
|
* whether B did a TOC setup sequence before calling us.
|
||||||
|
*
|
||||||
|
* On entry the LR points back to the _mcount() call site, and r0 holds the
|
||||||
|
* saved LR as it was on entry to B, ie. the original return address at the
|
||||||
|
* call site in A.
|
||||||
|
*
|
||||||
|
* Our job is to save the register state into a struct pt_regs (on the stack)
|
||||||
|
* and then arrange for the ftrace function to be called.
|
||||||
|
*/
|
||||||
|
_GLOBAL(ftrace_caller)
|
||||||
|
/* Save the original return address in A's stack frame */
|
||||||
|
std r0,LRSAVE(r1)
|
||||||
|
|
||||||
|
/* Create our stack frame + pt_regs */
|
||||||
|
stdu r1,-SWITCH_FRAME_SIZE(r1)
|
||||||
|
|
||||||
|
/* Save all gprs to pt_regs */
|
||||||
|
SAVE_8GPRS(0,r1)
|
||||||
|
SAVE_8GPRS(8,r1)
|
||||||
|
SAVE_8GPRS(16,r1)
|
||||||
|
SAVE_8GPRS(24,r1)
|
||||||
|
|
||||||
|
/* Load special regs for save below */
|
||||||
|
mfmsr r8
|
||||||
|
mfctr r9
|
||||||
|
mfxer r10
|
||||||
|
mfcr r11
|
||||||
|
|
||||||
|
/* Get the _mcount() call site out of LR */
|
||||||
|
mflr r7
|
||||||
|
/* Save it as pt_regs->nip */
|
||||||
|
std r7, _NIP(r1)
|
||||||
|
/* Save the read LR in pt_regs->link */
|
||||||
|
std r0, _LINK(r1)
|
||||||
|
|
||||||
|
/* Save callee's TOC in the ABI compliant location */
|
||||||
|
std r2, 24(r1)
|
||||||
|
ld r2,PACATOC(r13) /* get kernel TOC in r2 */
|
||||||
|
|
||||||
|
addis r3,r2,function_trace_op@toc@ha
|
||||||
|
addi r3,r3,function_trace_op@toc@l
|
||||||
|
ld r5,0(r3)
|
||||||
|
|
||||||
|
#ifdef CONFIG_LIVEPATCH
|
||||||
|
mr r14,r7 /* remember old NIP */
|
||||||
|
#endif
|
||||||
|
/* Calculate ip from nip-4 into r3 for call below */
|
||||||
|
subi r3, r7, MCOUNT_INSN_SIZE
|
||||||
|
|
||||||
|
/* Put the original return address in r4 as parent_ip */
|
||||||
|
mr r4, r0
|
||||||
|
|
||||||
|
/* Save special regs */
|
||||||
|
std r8, _MSR(r1)
|
||||||
|
std r9, _CTR(r1)
|
||||||
|
std r10, _XER(r1)
|
||||||
|
std r11, _CCR(r1)
|
||||||
|
|
||||||
|
/* Load &pt_regs in r6 for call below */
|
||||||
|
addi r6, r1 ,STACK_FRAME_OVERHEAD
|
||||||
|
|
||||||
|
/* ftrace_call(r3, r4, r5, r6) */
|
||||||
|
.globl ftrace_call
|
||||||
|
ftrace_call:
|
||||||
|
bl ftrace_stub
|
||||||
|
nop
|
||||||
|
|
||||||
|
/* Load ctr with the possibly modified NIP */
|
||||||
|
ld r3, _NIP(r1)
|
||||||
|
mtctr r3
|
||||||
|
#ifdef CONFIG_LIVEPATCH
|
||||||
|
cmpd r14,r3 /* has NIP been altered? */
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Restore gprs */
|
||||||
|
REST_8GPRS(0,r1)
|
||||||
|
REST_8GPRS(8,r1)
|
||||||
|
REST_8GPRS(16,r1)
|
||||||
|
REST_8GPRS(24,r1)
|
||||||
|
|
||||||
|
/* Restore possibly modified LR */
|
||||||
|
ld r0, _LINK(r1)
|
||||||
|
mtlr r0
|
||||||
|
|
||||||
|
/* Restore callee's TOC */
|
||||||
|
ld r2, 24(r1)
|
||||||
|
|
||||||
|
/* Pop our stack frame */
|
||||||
|
addi r1, r1, SWITCH_FRAME_SIZE
|
||||||
|
|
||||||
|
#ifdef CONFIG_LIVEPATCH
|
||||||
|
/* Based on the cmpd above, if the NIP was altered handle livepatch */
|
||||||
|
bne- livepatch_handler
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
.globl ftrace_graph_call
|
||||||
|
ftrace_graph_call:
|
||||||
|
b ftrace_graph_stub
|
||||||
|
_GLOBAL(ftrace_graph_stub)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
bctr /* jump after _mcount site */
|
||||||
|
|
||||||
|
_GLOBAL(ftrace_stub)
|
||||||
|
blr
|
||||||
|
|
||||||
|
#ifdef CONFIG_LIVEPATCH
|
||||||
|
/*
|
||||||
|
* This function runs in the mcount context, between two functions. As
|
||||||
|
* such it can only clobber registers which are volatile and used in
|
||||||
|
* function linkage.
|
||||||
|
*
|
||||||
|
* We get here when a function A, calls another function B, but B has
|
||||||
|
* been live patched with a new function C.
|
||||||
|
*
|
||||||
|
* On entry:
|
||||||
|
* - we have no stack frame and can not allocate one
|
||||||
|
* - LR points back to the original caller (in A)
|
||||||
|
* - CTR holds the new NIP in C
|
||||||
|
* - r0 & r12 are free
|
||||||
|
*
|
||||||
|
* r0 can't be used as the base register for a DS-form load or store, so
|
||||||
|
* we temporarily shuffle r1 (stack pointer) into r0 and then put it back.
|
||||||
|
*/
|
||||||
|
livepatch_handler:
|
||||||
|
CURRENT_THREAD_INFO(r12, r1)
|
||||||
|
|
||||||
|
/* Save stack pointer into r0 */
|
||||||
|
mr r0, r1
|
||||||
|
|
||||||
|
/* Allocate 3 x 8 bytes */
|
||||||
|
ld r1, TI_livepatch_sp(r12)
|
||||||
|
addi r1, r1, 24
|
||||||
|
std r1, TI_livepatch_sp(r12)
|
||||||
|
|
||||||
|
/* Save toc & real LR on livepatch stack */
|
||||||
|
std r2, -24(r1)
|
||||||
|
mflr r12
|
||||||
|
std r12, -16(r1)
|
||||||
|
|
||||||
|
/* Store stack end marker */
|
||||||
|
lis r12, STACK_END_MAGIC@h
|
||||||
|
ori r12, r12, STACK_END_MAGIC@l
|
||||||
|
std r12, -8(r1)
|
||||||
|
|
||||||
|
/* Restore real stack pointer */
|
||||||
|
mr r1, r0
|
||||||
|
|
||||||
|
/* Put ctr in r12 for global entry and branch there */
|
||||||
|
mfctr r12
|
||||||
|
bctrl
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Now we are returning from the patched function to the original
|
||||||
|
* caller A. We are free to use r0 and r12, and we can use r2 until we
|
||||||
|
* restore it.
|
||||||
|
*/
|
||||||
|
|
||||||
|
CURRENT_THREAD_INFO(r12, r1)
|
||||||
|
|
||||||
|
/* Save stack pointer into r0 */
|
||||||
|
mr r0, r1
|
||||||
|
|
||||||
|
ld r1, TI_livepatch_sp(r12)
|
||||||
|
|
||||||
|
/* Check stack marker hasn't been trashed */
|
||||||
|
lis r2, STACK_END_MAGIC@h
|
||||||
|
ori r2, r2, STACK_END_MAGIC@l
|
||||||
|
ld r12, -8(r1)
|
||||||
|
1: tdne r12, r2
|
||||||
|
EMIT_BUG_ENTRY 1b, __FILE__, __LINE__ - 1, 0
|
||||||
|
|
||||||
|
/* Restore LR & toc from livepatch stack */
|
||||||
|
ld r12, -16(r1)
|
||||||
|
mtlr r12
|
||||||
|
ld r2, -24(r1)
|
||||||
|
|
||||||
|
/* Pop livepatch stack frame */
|
||||||
|
CURRENT_THREAD_INFO(r12, r0)
|
||||||
|
subi r1, r1, 24
|
||||||
|
std r1, TI_livepatch_sp(r12)
|
||||||
|
|
||||||
|
/* Restore real stack pointer */
|
||||||
|
mr r1, r0
|
||||||
|
|
||||||
|
/* Return to original caller of live patched function */
|
||||||
|
blr
|
||||||
|
#endif /* CONFIG_LIVEPATCH */
|
||||||
|
|
||||||
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
_GLOBAL(ftrace_graph_caller)
|
||||||
|
stdu r1, -112(r1)
|
||||||
|
/* with -mprofile-kernel, parameter regs are still alive at _mcount */
|
||||||
|
std r10, 104(r1)
|
||||||
|
std r9, 96(r1)
|
||||||
|
std r8, 88(r1)
|
||||||
|
std r7, 80(r1)
|
||||||
|
std r6, 72(r1)
|
||||||
|
std r5, 64(r1)
|
||||||
|
std r4, 56(r1)
|
||||||
|
std r3, 48(r1)
|
||||||
|
|
||||||
|
/* Save callee's TOC in the ABI compliant location */
|
||||||
|
std r2, 24(r1)
|
||||||
|
ld r2, PACATOC(r13) /* get kernel TOC in r2 */
|
||||||
|
|
||||||
|
mfctr r4 /* ftrace_caller has moved local addr here */
|
||||||
|
std r4, 40(r1)
|
||||||
|
mflr r3 /* ftrace_caller has restored LR from stack */
|
||||||
|
subi r4, r4, MCOUNT_INSN_SIZE
|
||||||
|
|
||||||
|
bl prepare_ftrace_return
|
||||||
|
nop
|
||||||
|
|
||||||
|
/*
|
||||||
|
* prepare_ftrace_return gives us the address we divert to.
|
||||||
|
* Change the LR to this.
|
||||||
|
*/
|
||||||
|
mtlr r3
|
||||||
|
|
||||||
|
ld r0, 40(r1)
|
||||||
|
mtctr r0
|
||||||
|
ld r10, 104(r1)
|
||||||
|
ld r9, 96(r1)
|
||||||
|
ld r8, 88(r1)
|
||||||
|
ld r7, 80(r1)
|
||||||
|
ld r6, 72(r1)
|
||||||
|
ld r5, 64(r1)
|
||||||
|
ld r4, 56(r1)
|
||||||
|
ld r3, 48(r1)
|
||||||
|
|
||||||
|
/* Restore callee's TOC */
|
||||||
|
ld r2, 24(r1)
|
||||||
|
|
||||||
|
addi r1, r1, 112
|
||||||
|
mflr r0
|
||||||
|
std r0, LRSAVE(r1)
|
||||||
|
bctr
|
||||||
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
||||||
68
arch/powerpc/kernel/trace/ftrace_64_pg.S
Normal file
68
arch/powerpc/kernel/trace/ftrace_64_pg.S
Normal file
@ -0,0 +1,68 @@
|
|||||||
|
/*
|
||||||
|
* Split from ftrace_64.S
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License
|
||||||
|
* as published by the Free Software Foundation; either version
|
||||||
|
* 2 of the License, or (at your option) any later version.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <linux/magic.h>
|
||||||
|
#include <asm/ppc_asm.h>
|
||||||
|
#include <asm/asm-offsets.h>
|
||||||
|
#include <asm/ftrace.h>
|
||||||
|
#include <asm/ppc-opcode.h>
|
||||||
|
#include <asm/export.h>
|
||||||
|
|
||||||
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||||
|
_GLOBAL_TOC(ftrace_caller)
|
||||||
|
/* Taken from output of objdump from lib64/glibc */
|
||||||
|
mflr r3
|
||||||
|
ld r11, 0(r1)
|
||||||
|
stdu r1, -112(r1)
|
||||||
|
std r3, 128(r1)
|
||||||
|
ld r4, 16(r11)
|
||||||
|
subi r3, r3, MCOUNT_INSN_SIZE
|
||||||
|
.globl ftrace_call
|
||||||
|
ftrace_call:
|
||||||
|
bl ftrace_stub
|
||||||
|
nop
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
.globl ftrace_graph_call
|
||||||
|
ftrace_graph_call:
|
||||||
|
b ftrace_graph_stub
|
||||||
|
_GLOBAL(ftrace_graph_stub)
|
||||||
|
#endif
|
||||||
|
ld r0, 128(r1)
|
||||||
|
mtlr r0
|
||||||
|
addi r1, r1, 112
|
||||||
|
|
||||||
|
_GLOBAL(ftrace_stub)
|
||||||
|
blr
|
||||||
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
_GLOBAL(ftrace_graph_caller)
|
||||||
|
/* load r4 with local address */
|
||||||
|
ld r4, 128(r1)
|
||||||
|
subi r4, r4, MCOUNT_INSN_SIZE
|
||||||
|
|
||||||
|
/* Grab the LR out of the caller stack frame */
|
||||||
|
ld r11, 112(r1)
|
||||||
|
ld r3, 16(r11)
|
||||||
|
|
||||||
|
bl prepare_ftrace_return
|
||||||
|
nop
|
||||||
|
|
||||||
|
/*
|
||||||
|
* prepare_ftrace_return gives us the address we divert to.
|
||||||
|
* Change the LR in the callers stack frame to this.
|
||||||
|
*/
|
||||||
|
ld r11, 112(r1)
|
||||||
|
std r3, 16(r11)
|
||||||
|
|
||||||
|
ld r0, 128(r1)
|
||||||
|
mtlr r0
|
||||||
|
addi r1, r1, 112
|
||||||
|
blr
|
||||||
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
||||||
Loading…
Reference in New Issue
Block a user