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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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096ff2ddba
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>
86 lines
1.6 KiB
ArmAsm
86 lines
1.6 KiB
ArmAsm
/*
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* Split from entry_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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#ifdef CONFIG_DYNAMIC_FTRACE
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_GLOBAL(mcount)
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_GLOBAL(_mcount)
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EXPORT_SYMBOL(_mcount)
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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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#else /* CONFIG_DYNAMIC_FTRACE */
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_GLOBAL_TOC(_mcount)
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EXPORT_SYMBOL(_mcount)
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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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LOAD_REG_ADDR(r5,ftrace_trace_function)
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ld r5,0(r5)
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ld r5,0(r5)
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mtctr r5
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bctrl
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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b ftrace_graph_caller
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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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_GLOBAL(ftrace_stub)
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blr
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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_GLOBAL(return_to_handler)
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/* need to save return values */
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std r4, -32(r1)
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std r3, -24(r1)
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/* save TOC */
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std r2, -16(r1)
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std r31, -8(r1)
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mr r31, r1
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stdu r1, -112(r1)
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/*
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* We might be called from a module.
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* Switch to our TOC to run inside the core kernel.
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*/
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ld r2, PACATOC(r13)
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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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ld r1, 0(r1)
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ld r4, -32(r1)
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ld r3, -24(r1)
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ld r2, -16(r1)
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ld r31, -8(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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