CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
endif
-obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_32.o
-obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64.o
+obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_mprofile.o
ifdef CONFIG_MPROFILE_KERNEL
-obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_mprofile.o
+obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_mprofile.o
else
obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_pg.o
endif
+obj-$(CONFIG_FUNCTION_TRACER) += ftrace_low.o
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Split from entry_32.S
- */
-
-#include <linux/magic.h>
-#include <asm/reg.h>
-#include <asm/ppc_asm.h>
-#include <asm/asm-offsets.h>
-#include <asm/ftrace.h>
-#include <asm/export.h>
-#include <asm/ptrace.h>
-
-_GLOBAL(mcount)
-_GLOBAL(_mcount)
- /*
- * It is required that _mcount on PPC32 must preserve the
- * link register. But we have r12 to play with. We use r12
- * to push the return address back to the caller of mcount
- * into the ctr register, restore the link register and
- * then jump back using the ctr register.
- */
- mflr r12
- mtctr r12
- mtlr r0
- bctr
-EXPORT_SYMBOL(_mcount)
-
-_GLOBAL(ftrace_caller)
- stwu r1, -INT_FRAME_SIZE(r1)
-
- SAVE_GPRS(3, 10, r1)
-
- addi r8, r1, INT_FRAME_SIZE
- stw r8, GPR1(r1)
-
- mflr r3
- stw r3, _NIP(r1)
- subi r3, r3, MCOUNT_INSN_SIZE
-
- stw r0, _LINK(r1)
- mr r4, r0
-
- lis r5,function_trace_op@ha
- lwz r5,function_trace_op@l(r5)
-
- addi r6, r1, STACK_FRAME_OVERHEAD
-.globl ftrace_call
-ftrace_call:
- bl ftrace_stub
- nop
-
- lwz r3, _NIP(r1)
- mtctr r3
-
- REST_GPRS(3, 10, r1)
-
- lwz r0, _LINK(r1)
- mtlr r0
-
- addi r1, r1, INT_FRAME_SIZE
- /* old link register ends up in ctr reg */
- bctr
-
-
-_GLOBAL(ftrace_stub)
- blr
-
-_GLOBAL(ftrace_regs_caller)
- /* Create our stack frame + pt_regs */
- stwu r1,-INT_FRAME_SIZE(r1)
-
- /* Save all gprs to pt_regs */
- stw r0, GPR0(r1)
- stmw r2, GPR2(r1)
-
- /* Save previous stack pointer (r1) */
- addi r8, r1, INT_FRAME_SIZE
- stw r8, GPR1(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 */
- stw r7, _NIP(r1)
- /* Save the read LR in pt_regs->link */
- stw r0, _LINK(r1)
-
- lis r3,function_trace_op@ha
- lwz r5,function_trace_op@l(r3)
-
- /* 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 */
- stw r8, _MSR(r1)
- stw r9, _CTR(r1)
- stw r10, _XER(r1)
- stw 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_regs_call
-ftrace_regs_call:
- bl ftrace_stub
- nop
-
- /* Load ctr with the possibly modified NIP */
- lwz r3, _NIP(r1)
- mtctr r3
-
- /* Restore gprs */
- lmw r2, GPR2(r1)
-
- /* Restore possibly modified LR */
- lwz r0, _LINK(r1)
- mtlr r0
-
- /* Pop our stack frame */
- addi r1, r1, INT_FRAME_SIZE
- /* old link register ends up in ctr reg */
- bctr
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-_GLOBAL(return_to_handler)
- /* need to save return values */
- stwu r1, -16(r1)
- stw r3, 8(r1)
- stw r4, 12(r1)
-
- bl ftrace_return_to_handler
-
- /* return value has real return address */
- mtlr r3
-
- lwz r3, 8(r1)
- lwz r4, 12(r1)
- addi r1, r1, 16
-
- /* Jump back to real return address */
- blr
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Split from entry_64.S
- */
-
-#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>
-
-.pushsection ".tramp.ftrace.text","aw",@progbits;
-.globl ftrace_tramp_text
-ftrace_tramp_text:
- .space 64
-.popsection
-
-.pushsection ".tramp.ftrace.init","aw",@progbits;
-.globl ftrace_tramp_init
-ftrace_tramp_init:
- .space 64
-.popsection
-
-_GLOBAL(mcount)
-_GLOBAL(_mcount)
-EXPORT_SYMBOL(_mcount)
- mflr r12
- mtctr r12
- mtlr r0
- bctr
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-_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 */
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Split from ftrace_64.S
- */
-
-#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>
-#include <asm/thread_info.h>
-#include <asm/bug.h>
-#include <asm/ptrace.h>
-
-/*
- *
- * ftrace_caller()/ftrace_regs_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_regs_caller)
- /* Save the original return address in A's stack frame */
-#ifdef CONFIG_MPROFILE_KERNEL
- PPC_STL r0,LRSAVE(r1)
-#endif
-
- /* Create our stack frame + pt_regs */
- PPC_STLU r1,-SWITCH_FRAME_SIZE(r1)
-
- /* Save all gprs to pt_regs */
- SAVE_GPR(0, r1)
-#ifdef CONFIG_PPC64
- SAVE_GPRS(2, 11, r1)
-
- /* Ok to continue? */
- lbz r3, PACA_FTRACE_ENABLED(r13)
- cmpdi r3, 0
- beq ftrace_no_trace
-
- SAVE_GPRS(12, 31, r1)
-#else
- stmw r2, GPR2(r1)
-#endif
-
- /* Save previous stack pointer (r1) */
- addi r8, r1, SWITCH_FRAME_SIZE
- PPC_STL r8, GPR1(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 */
- PPC_STL r7, _NIP(r1)
- /* Save the read LR in pt_regs->link */
- PPC_STL r0, _LINK(r1)
-
-#ifdef CONFIG_PPC64
- /* 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)
-#else
- lis r3,function_trace_op@ha
- lwz r5,function_trace_op@l(r3)
-#endif
-
-#ifdef CONFIG_LIVEPATCH_64
- 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 */
- PPC_STL r8, _MSR(r1)
- PPC_STL r9, _CTR(r1)
- PPC_STL r10, _XER(r1)
- PPC_STL 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_regs_call
-ftrace_regs_call:
- bl ftrace_stub
- nop
-
- /* Load ctr with the possibly modified NIP */
- PPC_LL r3, _NIP(r1)
- mtctr r3
-#ifdef CONFIG_LIVEPATCH_64
- cmpd r14, r3 /* has NIP been altered? */
-#endif
-
- /* Restore gprs */
-#ifdef CONFIG_PPC64
- REST_GPRS(2, 31, r1)
-#else
- lmw r2, GPR2(r1)
-#endif
-
- /* Restore possibly modified LR */
- PPC_LL r0, _LINK(r1)
- mtlr r0
-
-#ifdef CONFIG_PPC64
- /* Restore callee's TOC */
- ld r2, 24(r1)
-#endif
-
- /* Pop our stack frame */
- addi r1, r1, SWITCH_FRAME_SIZE
-
-#ifdef CONFIG_LIVEPATCH_64
- /* Based on the cmpd above, if the NIP was altered handle livepatch */
- bne- livepatch_handler
-#endif
- bctr /* jump after _mcount site */
-
-_GLOBAL(ftrace_stub)
- blr
-
-#ifdef CONFIG_PPC64
-ftrace_no_trace:
- mflr r3
- mtctr r3
- REST_GPR(3, r1)
- addi r1, r1, SWITCH_FRAME_SIZE
- mtlr r0
- bctr
-#endif
-
-_GLOBAL(ftrace_caller)
- /* Save the original return address in A's stack frame */
-#ifdef CONFIG_MPROFILE_KERNEL
- PPC_STL r0, LRSAVE(r1)
-#endif
-
- /* Create our stack frame + pt_regs */
- PPC_STLU r1, -SWITCH_FRAME_SIZE(r1)
-
- /* Save all gprs to pt_regs */
- SAVE_GPRS(3, 10, r1)
-
-#ifdef CONFIG_PPC64
- lbz r3, PACA_FTRACE_ENABLED(r13)
- cmpdi r3, 0
- beq ftrace_no_trace
-#endif
-
- /* Get the _mcount() call site out of LR */
- mflr r7
- PPC_STL r7, _NIP(r1)
-
-#ifdef CONFIG_PPC64
- /* 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)
-#else
- lis r3,function_trace_op@ha
- lwz r5,function_trace_op@l(r3)
-#endif
-
-#ifdef CONFIG_LIVEPATCH_64
- SAVE_GPR(14, r1)
- 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 */
- PPC_STL r0, _LINK(r1)
- mr r4, r0
-
- /* 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
-
- PPC_LL r3, _NIP(r1)
- mtctr r3
-#ifdef CONFIG_LIVEPATCH_64
- cmpd r14, r3 /* has NIP been altered? */
- REST_GPR(14, r1)
-#endif
-
- /* Restore gprs */
- REST_GPRS(3, 10, r1)
-
-#ifdef CONFIG_PPC64
- /* Restore callee's TOC */
- ld r2, 24(r1)
-#endif
-
- /* Restore possibly modified LR */
- PPC_LL r0, _LINK(r1)
- mtlr r0
-
- /* Pop our stack frame */
- addi r1, r1, SWITCH_FRAME_SIZE
-
-#ifdef CONFIG_LIVEPATCH_64
- /* Based on the cmpd above, if the NIP was altered handle livepatch */
- bne- livepatch_handler
-#endif
- bctr /* jump after _mcount site */
-
-#ifdef CONFIG_LIVEPATCH_64
- /*
- * 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, r11 & r12 are free
- */
-livepatch_handler:
- ld r12, PACA_THREAD_INFO(r13)
-
- /* Allocate 3 x 8 bytes */
- ld r11, TI_livepatch_sp(r12)
- addi r11, r11, 24
- std r11, TI_livepatch_sp(r12)
-
- /* Save toc & real LR on livepatch stack */
- std r2, -24(r11)
- mflr r12
- std r12, -16(r11)
-
- /* Store stack end marker */
- lis r12, STACK_END_MAGIC@h
- ori r12, r12, STACK_END_MAGIC@l
- std r12, -8(r11)
-
- /* 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 r11, r12 and we can use r2 until we
- * restore it.
- */
-
- ld r12, PACA_THREAD_INFO(r13)
-
- ld r11, 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(r11)
-1: tdne r12, r2
- EMIT_BUG_ENTRY 1b, __FILE__, __LINE__ - 1, 0
-
- /* Restore LR & toc from livepatch stack */
- ld r12, -16(r11)
- mtlr r12
- ld r2, -24(r11)
-
- /* Pop livepatch stack frame */
- ld r12, PACA_THREAD_INFO(r13)
- subi r11, r11, 24
- std r11, TI_livepatch_sp(r12)
-
- /* Return to original caller of live patched function */
- blr
-#endif /* CONFIG_LIVEPATCH */
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Split from entry_64.S
+ */
+
+#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_PPC64
+.pushsection ".tramp.ftrace.text","aw",@progbits;
+.globl ftrace_tramp_text
+ftrace_tramp_text:
+ .space 64
+.popsection
+
+.pushsection ".tramp.ftrace.init","aw",@progbits;
+.globl ftrace_tramp_init
+ftrace_tramp_init:
+ .space 64
+.popsection
+#endif
+
+_GLOBAL(mcount)
+_GLOBAL(_mcount)
+EXPORT_SYMBOL(_mcount)
+ mflr r12
+ mtctr r12
+ mtlr r0
+ bctr
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+_GLOBAL(return_to_handler)
+ /* need to save return values */
+#ifdef CONFIG_PPC64
+ 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)
+#else
+ stwu r1, -16(r1)
+ stw r3, 8(r1)
+ stw r4, 12(r1)
+#endif
+
+ bl ftrace_return_to_handler
+ nop
+
+ /* return value has real return address */
+ mtlr r3
+
+#ifdef CONFIG_PPC64
+ ld r1, 0(r1)
+ ld r4, -32(r1)
+ ld r3, -24(r1)
+ ld r2, -16(r1)
+ ld r31, -8(r1)
+#else
+ lwz r3, 8(r1)
+ lwz r4, 12(r1)
+ addi r1, r1, 16
+#endif
+
+ /* Jump back to real return address */
+ blr
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Split from ftrace_64.S
+ */
+
+#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>
+#include <asm/thread_info.h>
+#include <asm/bug.h>
+#include <asm/ptrace.h>
+
+/*
+ *
+ * ftrace_caller()/ftrace_regs_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_regs_caller)
+ /* Save the original return address in A's stack frame */
+#ifdef CONFIG_MPROFILE_KERNEL
+ PPC_STL r0,LRSAVE(r1)
+#endif
+
+ /* Create our stack frame + pt_regs */
+ PPC_STLU r1,-SWITCH_FRAME_SIZE(r1)
+
+ /* Save all gprs to pt_regs */
+ SAVE_GPR(0, r1)
+#ifdef CONFIG_PPC64
+ SAVE_GPRS(2, 11, r1)
+
+ /* Ok to continue? */
+ lbz r3, PACA_FTRACE_ENABLED(r13)
+ cmpdi r3, 0
+ beq ftrace_no_trace
+
+ SAVE_GPRS(12, 31, r1)
+#else
+ stmw r2, GPR2(r1)
+#endif
+
+ /* Save previous stack pointer (r1) */
+ addi r8, r1, SWITCH_FRAME_SIZE
+ PPC_STL r8, GPR1(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 */
+ PPC_STL r7, _NIP(r1)
+ /* Save the read LR in pt_regs->link */
+ PPC_STL r0, _LINK(r1)
+
+#ifdef CONFIG_PPC64
+ /* 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)
+#else
+ lis r3,function_trace_op@ha
+ lwz r5,function_trace_op@l(r3)
+#endif
+
+#ifdef CONFIG_LIVEPATCH_64
+ 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 */
+ PPC_STL r8, _MSR(r1)
+ PPC_STL r9, _CTR(r1)
+ PPC_STL r10, _XER(r1)
+ PPC_STL 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_regs_call
+ftrace_regs_call:
+ bl ftrace_stub
+ nop
+
+ /* Load ctr with the possibly modified NIP */
+ PPC_LL r3, _NIP(r1)
+ mtctr r3
+#ifdef CONFIG_LIVEPATCH_64
+ cmpd r14, r3 /* has NIP been altered? */
+#endif
+
+ /* Restore gprs */
+#ifdef CONFIG_PPC64
+ REST_GPRS(2, 31, r1)
+#else
+ lmw r2, GPR2(r1)
+#endif
+
+ /* Restore possibly modified LR */
+ PPC_LL r0, _LINK(r1)
+ mtlr r0
+
+#ifdef CONFIG_PPC64
+ /* Restore callee's TOC */
+ ld r2, 24(r1)
+#endif
+
+ /* Pop our stack frame */
+ addi r1, r1, SWITCH_FRAME_SIZE
+
+#ifdef CONFIG_LIVEPATCH_64
+ /* Based on the cmpd above, if the NIP was altered handle livepatch */
+ bne- livepatch_handler
+#endif
+ bctr /* jump after _mcount site */
+
+_GLOBAL(ftrace_stub)
+ blr
+
+#ifdef CONFIG_PPC64
+ftrace_no_trace:
+ mflr r3
+ mtctr r3
+ REST_GPR(3, r1)
+ addi r1, r1, SWITCH_FRAME_SIZE
+ mtlr r0
+ bctr
+#endif
+
+_GLOBAL(ftrace_caller)
+ /* Save the original return address in A's stack frame */
+#ifdef CONFIG_MPROFILE_KERNEL
+ PPC_STL r0, LRSAVE(r1)
+#endif
+
+ /* Create our stack frame + pt_regs */
+ PPC_STLU r1, -SWITCH_FRAME_SIZE(r1)
+
+ /* Save all gprs to pt_regs */
+ SAVE_GPRS(3, 10, r1)
+
+#ifdef CONFIG_PPC64
+ lbz r3, PACA_FTRACE_ENABLED(r13)
+ cmpdi r3, 0
+ beq ftrace_no_trace
+#endif
+
+ /* Get the _mcount() call site out of LR */
+ mflr r7
+ PPC_STL r7, _NIP(r1)
+
+#ifdef CONFIG_PPC64
+ /* 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)
+#else
+ lis r3,function_trace_op@ha
+ lwz r5,function_trace_op@l(r3)
+#endif
+
+#ifdef CONFIG_LIVEPATCH_64
+ SAVE_GPR(14, r1)
+ 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 */
+ PPC_STL r0, _LINK(r1)
+ mr r4, r0
+
+ /* 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
+
+ PPC_LL r3, _NIP(r1)
+ mtctr r3
+#ifdef CONFIG_LIVEPATCH_64
+ cmpd r14, r3 /* has NIP been altered? */
+ REST_GPR(14, r1)
+#endif
+
+ /* Restore gprs */
+ REST_GPRS(3, 10, r1)
+
+#ifdef CONFIG_PPC64
+ /* Restore callee's TOC */
+ ld r2, 24(r1)
+#endif
+
+ /* Restore possibly modified LR */
+ PPC_LL r0, _LINK(r1)
+ mtlr r0
+
+ /* Pop our stack frame */
+ addi r1, r1, SWITCH_FRAME_SIZE
+
+#ifdef CONFIG_LIVEPATCH_64
+ /* Based on the cmpd above, if the NIP was altered handle livepatch */
+ bne- livepatch_handler
+#endif
+ bctr /* jump after _mcount site */
+
+#ifdef CONFIG_LIVEPATCH_64
+ /*
+ * 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, r11 & r12 are free
+ */
+livepatch_handler:
+ ld r12, PACA_THREAD_INFO(r13)
+
+ /* Allocate 3 x 8 bytes */
+ ld r11, TI_livepatch_sp(r12)
+ addi r11, r11, 24
+ std r11, TI_livepatch_sp(r12)
+
+ /* Save toc & real LR on livepatch stack */
+ std r2, -24(r11)
+ mflr r12
+ std r12, -16(r11)
+
+ /* Store stack end marker */
+ lis r12, STACK_END_MAGIC@h
+ ori r12, r12, STACK_END_MAGIC@l
+ std r12, -8(r11)
+
+ /* 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 r11, r12 and we can use r2 until we
+ * restore it.
+ */
+
+ ld r12, PACA_THREAD_INFO(r13)
+
+ ld r11, 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(r11)
+1: tdne r12, r2
+ EMIT_BUG_ENTRY 1b, __FILE__, __LINE__ - 1, 0
+
+ /* Restore LR & toc from livepatch stack */
+ ld r12, -16(r11)
+ mtlr r12
+ ld r2, -24(r11)
+
+ /* Pop livepatch stack frame */
+ ld r12, PACA_THREAD_INFO(r13)
+ subi r11, r11, 24
+ std r11, TI_livepatch_sp(r12)
+
+ /* Return to original caller of live patched function */
+ blr
+#endif /* CONFIG_LIVEPATCH */
projects / kernel.git / commitdiff