#include <linux/errno.h>
#include <linux/err.h>
-#include <linux/magic.h>
#include <asm/unistd.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/bug.h>
#include <asm/ptrace.h>
#include <asm/irqflags.h>
-#include <asm/ftrace.h>
#include <asm/hw_irq.h>
#include <asm/context_tracking.h>
#include <asm/tm.h>
ld r0,16(r1)
mtlr r0
blr
-
-#ifdef CONFIG_FUNCTION_TRACER
-#ifdef CONFIG_DYNAMIC_FTRACE
-_GLOBAL(mcount)
-_GLOBAL(_mcount)
-EXPORT_SYMBOL(_mcount)
- mflr r12
- mtctr r12
- mtlr r0
- bctr
-
-#ifndef CC_USING_MPROFILE_KERNEL
-_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
-
-#else /* CC_USING_MPROFILE_KERNEL */
-/*
- *
- * ftrace_caller() is the function that replaces _mcount() when ftrace is
- * active.
- *
- * We arrive here after a function A calls function B, and we are the trace
- * 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 & pt_regs->link */
- std r7, _NIP(r1)
- std r7, _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 callee's TOC */
- ld r2, 24(r1)
-
- /* Pop our stack frame */
- addi r1, r1, SWITCH_FRAME_SIZE
-
- /* Restore original LR for return to B */
- ld r0, LRSAVE(r1)
- mtlr r0
-
-#ifdef CONFIG_LIVEPATCH
- /* Based on the cmpd above, if the NIP was altered handle livepatch */
- bne- livepatch_handler
-#endif
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- stdu r1, -112(r1)
-.globl ftrace_graph_call
-ftrace_graph_call:
- b ftrace_graph_stub
-_GLOBAL(ftrace_graph_stub)
- addi r1, r1, 112
-#endif
-
- ld r0,LRSAVE(r1) /* restore callee's lr at _mcount site */
- mtlr r0
- bctr /* jump after _mcount site */
-#endif /* CC_USING_MPROFILE_KERNEL */
-
-_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
-
-
-#else
-_GLOBAL_TOC(_mcount)
-EXPORT_SYMBOL(_mcount)
- /* 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
- LOAD_REG_ADDR(r5,ftrace_trace_function)
- ld r5,0(r5)
- ld r5,0(r5)
- mtctr r5
- bctrl
- nop
-
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- b ftrace_graph_caller
-#endif
- ld r0, 128(r1)
- mtlr r0
- addi r1, r1, 112
-_GLOBAL(ftrace_stub)
- blr
-
-#endif /* CONFIG_DYNAMIC_FTRACE */
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-#ifndef CC_USING_MPROFILE_KERNEL
-_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
-
-#else /* CC_USING_MPROFILE_KERNEL */
-_GLOBAL(ftrace_graph_caller)
- /* 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 /* CC_USING_MPROFILE_KERNEL */
-
-_GLOBAL(return_to_handler)
- /* need to save return values */
- std r4, -32(r1)
- std r3, -24(r1)
- /* save TOC */
- std r2, -16(r1)
- std r31, -8(r1)
- mr r31, r1
- stdu r1, -112(r1)
-
- /*
- * We might be called from a module.
- * Switch to our TOC to run inside the core kernel.
- */
- ld r2, PACATOC(r13)
-
- bl ftrace_return_to_handler
- nop
-
- /* return value has real return address */
- mtlr r3
-
- ld r1, 0(r1)
- ld r4, -32(r1)
- ld r3, -24(r1)
- ld r2, -16(r1)
- ld r31, -8(r1)
-
- /* Jump back to real return address */
- blr
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
-#endif /* CONFIG_FUNCTION_TRACER */
projects / karo-tx-linux.git / blobdiff