437d3e124d
- Add support for ARCH_SUPPORTS_FTRACE_OPS
- Replace the instruction in ftrace_call with the bundle {move r10, lr;
jal ftrace_stub}, so that the lr contains the right value after returning
from ftrace_stub. An alternative fix might be to leave the instruction
in ftrace_call alone when it is being updated with ftrace_stub.
Signed-off-by: Tony Lu <zlu@ezchip.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
212 lines
4.7 KiB
ArmAsm
212 lines
4.7 KiB
ArmAsm
/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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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, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* TILE-Gx specific __mcount support
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*/
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#include <linux/linkage.h>
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#include <asm/ftrace.h>
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#define REGSIZE 8
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.text
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.global __mcount
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.macro MCOUNT_SAVE_REGS
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addli sp, sp, -REGSIZE
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{
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st sp, lr
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addli r29, sp, - (12 * REGSIZE)
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}
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{
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addli sp, sp, - (13 * REGSIZE)
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st r29, sp
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}
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addli r29, r29, REGSIZE
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{ st r29, r0; addli r29, r29, REGSIZE }
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{ st r29, r1; addli r29, r29, REGSIZE }
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{ st r29, r2; addli r29, r29, REGSIZE }
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{ st r29, r3; addli r29, r29, REGSIZE }
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{ st r29, r4; addli r29, r29, REGSIZE }
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{ st r29, r5; addli r29, r29, REGSIZE }
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{ st r29, r6; addli r29, r29, REGSIZE }
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{ st r29, r7; addli r29, r29, REGSIZE }
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{ st r29, r8; addli r29, r29, REGSIZE }
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{ st r29, r9; addli r29, r29, REGSIZE }
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{ st r29, r10; addli r29, r29, REGSIZE }
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.endm
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.macro MCOUNT_RESTORE_REGS
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addli r29, sp, (2 * REGSIZE)
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{ ld r0, r29; addli r29, r29, REGSIZE }
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{ ld r1, r29; addli r29, r29, REGSIZE }
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{ ld r2, r29; addli r29, r29, REGSIZE }
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{ ld r3, r29; addli r29, r29, REGSIZE }
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{ ld r4, r29; addli r29, r29, REGSIZE }
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{ ld r5, r29; addli r29, r29, REGSIZE }
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{ ld r6, r29; addli r29, r29, REGSIZE }
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{ ld r7, r29; addli r29, r29, REGSIZE }
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{ ld r8, r29; addli r29, r29, REGSIZE }
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{ ld r9, r29; addli r29, r29, REGSIZE }
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{ ld r10, r29; addli lr, sp, (13 * REGSIZE) }
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{ ld lr, lr; addli sp, sp, (14 * REGSIZE) }
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.endm
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.macro RETURN_BACK
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{ move r12, lr; move lr, r10 }
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jrp r12
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.endm
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#ifdef CONFIG_DYNAMIC_FTRACE
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.align 64
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STD_ENTRY(__mcount)
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__mcount:
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j ftrace_stub
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STD_ENDPROC(__mcount)
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.align 64
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STD_ENTRY(ftrace_caller)
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MCOUNT_SAVE_REGS
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/* arg1: self return address */
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/* arg2: parent's return address */
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/* arg3: ftrace_ops */
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/* arg4: regs (but make it NULL) */
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{ move r0, lr; moveli r2, hw2_last(function_trace_op) }
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{ move r1, r10; shl16insli r2, r2, hw1(function_trace_op) }
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{ movei r3, 0; shl16insli r2, r2, hw0(function_trace_op) }
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ld r2,r2
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.global ftrace_call
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ftrace_call:
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/*
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* a placeholder for the call to a real tracing function, i.e.
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* ftrace_trace_function()
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*/
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.global ftrace_graph_call
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ftrace_graph_call:
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/*
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* a placeholder for the call to a real tracing function, i.e.
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* ftrace_graph_caller()
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*/
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nop
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#endif
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MCOUNT_RESTORE_REGS
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.global ftrace_stub
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ftrace_stub:
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RETURN_BACK
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STD_ENDPROC(ftrace_caller)
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#else /* ! CONFIG_DYNAMIC_FTRACE */
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.align 64
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STD_ENTRY(__mcount)
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{
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moveli r11, hw2_last(ftrace_trace_function)
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moveli r13, hw2_last(ftrace_stub)
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}
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{
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shl16insli r11, r11, hw1(ftrace_trace_function)
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shl16insli r13, r13, hw1(ftrace_stub)
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}
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{
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shl16insli r11, r11, hw0(ftrace_trace_function)
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shl16insli r13, r13, hw0(ftrace_stub)
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}
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ld r11, r11
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sub r14, r13, r11
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bnez r14, static_trace
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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moveli r15, hw2_last(ftrace_graph_return)
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shl16insli r15, r15, hw1(ftrace_graph_return)
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shl16insli r15, r15, hw0(ftrace_graph_return)
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ld r15, r15
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sub r15, r15, r13
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bnez r15, ftrace_graph_caller
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{
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moveli r16, hw2_last(ftrace_graph_entry)
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moveli r17, hw2_last(ftrace_graph_entry_stub)
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}
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{
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shl16insli r16, r16, hw1(ftrace_graph_entry)
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shl16insli r17, r17, hw1(ftrace_graph_entry_stub)
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}
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{
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shl16insli r16, r16, hw0(ftrace_graph_entry)
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shl16insli r17, r17, hw0(ftrace_graph_entry_stub)
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}
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ld r16, r16
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sub r17, r16, r17
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bnez r17, ftrace_graph_caller
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#endif
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RETURN_BACK
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static_trace:
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MCOUNT_SAVE_REGS
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/* arg1: self return address */
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/* arg2: parent's return address */
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{ move r0, lr; move r1, r10 }
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/* call ftrace_trace_function() */
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jalr r11
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MCOUNT_RESTORE_REGS
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.global ftrace_stub
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ftrace_stub:
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RETURN_BACK
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STD_ENDPROC(__mcount)
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#endif /* ! CONFIG_DYNAMIC_FTRACE */
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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STD_ENTRY(ftrace_graph_caller)
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ftrace_graph_caller:
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#ifndef CONFIG_DYNAMIC_FTRACE
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MCOUNT_SAVE_REGS
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#endif
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/* arg1: Get the location of the parent's return address */
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addi r0, sp, 12 * REGSIZE
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/* arg2: Get self return address */
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move r1, lr
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jal prepare_ftrace_return
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MCOUNT_RESTORE_REGS
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RETURN_BACK
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STD_ENDPROC(ftrace_graph_caller)
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.global return_to_handler
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return_to_handler:
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MCOUNT_SAVE_REGS
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jal ftrace_return_to_handler
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/* restore the real parent address */
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move r11, r0
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MCOUNT_RESTORE_REGS
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jr r11
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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