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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d983c89cc9
Utilize -mfentry and -mnop-mcount gcc options together with -mrecord-mcount to get compiler generated calls to the profiling functions as nops which are compatible with current -mhotpatch=0,3 approach. At the same time -mrecord-mcount enables __mcount_loc section generation by the compiler which allows to avoid using scripts/recordmcount.pl script. Link: http://lkml.kernel.org/r/patch-4.thread-aa7b8d.git-aa7b8dbf236f.your-ad-here.call-01533557518-ext-9465@work.hours Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
91 lines
2.1 KiB
ArmAsm
91 lines
2.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 2008, 2009
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*
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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*
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*/
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/ftrace.h>
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#include <asm/nospec-insn.h>
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#include <asm/ptrace.h>
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#include <asm/export.h>
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GEN_BR_THUNK %r1
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GEN_BR_THUNK %r14
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.section .kprobes.text, "ax"
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ENTRY(ftrace_stub)
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BR_EX %r14
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#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
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#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
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#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
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#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
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ENTRY(_mcount)
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BR_EX %r14
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EXPORT_SYMBOL(_mcount)
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ENTRY(ftrace_caller)
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.globl ftrace_regs_caller
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.set ftrace_regs_caller,ftrace_caller
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lgr %r1,%r15
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#if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT))
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aghi %r0,MCOUNT_RETURN_FIXUP
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#endif
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aghi %r15,-STACK_FRAME_SIZE
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stg %r1,__SF_BACKCHAIN(%r15)
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stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
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stg %r0,(STACK_PTREGS_PSW+8)(%r15)
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stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
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#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
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aghik %r2,%r0,-MCOUNT_INSN_SIZE
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lgrl %r4,function_trace_op
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lgrl %r1,ftrace_trace_function
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#else
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lgr %r2,%r0
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aghi %r2,-MCOUNT_INSN_SIZE
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larl %r4,function_trace_op
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lg %r4,0(%r4)
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larl %r1,ftrace_trace_function
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lg %r1,0(%r1)
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#endif
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lgr %r3,%r14
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la %r5,STACK_PTREGS(%r15)
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BASR_EX %r14,%r1
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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# The j instruction gets runtime patched to a nop instruction.
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# See ftrace_enable_ftrace_graph_caller.
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ENTRY(ftrace_graph_caller)
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j ftrace_graph_caller_end
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lg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
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lg %r3,(STACK_PTREGS_PSW+8)(%r15)
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brasl %r14,prepare_ftrace_return
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stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
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ftrace_graph_caller_end:
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.globl ftrace_graph_caller_end
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#endif
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lg %r1,(STACK_PTREGS_PSW+8)(%r15)
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lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
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BR_EX %r1
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ENTRY(return_to_handler)
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stmg %r2,%r5,32(%r15)
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lgr %r1,%r15
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aghi %r15,-STACK_FRAME_OVERHEAD
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stg %r1,__SF_BACKCHAIN(%r15)
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brasl %r14,ftrace_return_to_handler
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aghi %r15,STACK_FRAME_OVERHEAD
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lgr %r14,%r2
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lmg %r2,%r5,32(%r15)
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BR_EX %r14
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#endif
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