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187 lines
3.6 KiB
187 lines
3.6 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Split from entry_32.S |
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*/ |
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#include <linux/magic.h> |
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#include <asm/reg.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/export.h> |
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#include <asm/ptrace.h> |
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_GLOBAL(mcount) |
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_GLOBAL(_mcount) |
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/* |
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* It is required that _mcount on PPC32 must preserve the |
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* link register. But we have r12 to play with. We use r12 |
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* to push the return address back to the caller of mcount |
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* into the ctr register, restore the link register and |
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* then jump back using the ctr register. |
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*/ |
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mflr r12 |
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mtctr r12 |
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mtlr r0 |
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bctr |
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EXPORT_SYMBOL(_mcount) |
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_GLOBAL(ftrace_caller) |
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MCOUNT_SAVE_FRAME |
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/* r3 ends up with link register */ |
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subi r3, r3, MCOUNT_INSN_SIZE |
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lis r5,function_trace_op@ha |
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lwz r5,function_trace_op@l(r5) |
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li r6, 0 |
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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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MCOUNT_RESTORE_FRAME |
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ftrace_caller_common: |
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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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/* old link register ends up in ctr reg */ |
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bctr |
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_GLOBAL(ftrace_stub) |
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blr |
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_GLOBAL(ftrace_regs_caller) |
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/* Save the original return address in A's stack frame */ |
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stw r0,LRSAVE(r1) |
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/* Create our stack frame + pt_regs */ |
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stwu r1,-INT_FRAME_SIZE(r1) |
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/* Save all gprs to pt_regs */ |
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stw r0, GPR0(r1) |
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stmw r2, GPR2(r1) |
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/* Save previous stack pointer (r1) */ |
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addi r8, r1, INT_FRAME_SIZE |
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stw r8, GPR1(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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stw r7, _NIP(r1) |
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/* Save the read LR in pt_regs->link */ |
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stw r0, _LINK(r1) |
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lis r3,function_trace_op@ha |
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lwz r5,function_trace_op@l(r3) |
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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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stw r8, _MSR(r1) |
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stw r9, _CTR(r1) |
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stw r10, _XER(r1) |
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stw 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_regs_call |
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ftrace_regs_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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lwz r3, _NIP(r1) |
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mtctr r3 |
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/* Restore gprs */ |
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lmw r2, GPR2(r1) |
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/* Restore possibly modified LR */ |
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lwz r0, _LINK(r1) |
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mtlr r0 |
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/* Pop our stack frame */ |
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addi r1, r1, INT_FRAME_SIZE |
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b ftrace_caller_common |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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_GLOBAL(ftrace_graph_caller) |
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stwu r1,-48(r1) |
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stw r3, 12(r1) |
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stw r4, 16(r1) |
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stw r5, 20(r1) |
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stw r6, 24(r1) |
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stw r7, 28(r1) |
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stw r8, 32(r1) |
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stw r9, 36(r1) |
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stw r10,40(r1) |
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addi r5, r1, 48 |
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mfctr r4 /* ftrace_caller has moved local addr here */ |
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stw r4, 44(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 in the callers stack frame to this. |
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*/ |
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stw r3,52(r1) |
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mtlr r3 |
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lwz r0,44(r1) |
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mtctr r0 |
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lwz r3, 12(r1) |
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lwz r4, 16(r1) |
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lwz r5, 20(r1) |
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lwz r6, 24(r1) |
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lwz r7, 28(r1) |
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lwz r8, 32(r1) |
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lwz r9, 36(r1) |
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lwz r10,40(r1) |
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addi r1, r1, 48 |
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bctr |
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_GLOBAL(return_to_handler) |
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/* need to save return values */ |
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stwu r1, -32(r1) |
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stw r3, 20(r1) |
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stw r4, 16(r1) |
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stw r31, 12(r1) |
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mr r31, r1 |
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bl ftrace_return_to_handler |
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nop |
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/* return value has real return address */ |
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mtlr r3 |
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lwz r3, 20(r1) |
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lwz r4, 16(r1) |
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lwz r31,12(r1) |
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lwz r1, 0(r1) |
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/* Jump back to real return address */ |
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blr |
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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