ARM: ftrace: use gas macros to avoid code duplication
Use assembler macros to avoid copy/pasting code between the implementations of the two variants of the mcount call. Signed-off-by: Rabin Vincent <rabin@rab.in>
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Rabin Vincent
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d3b9dc9dd2
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@ -141,98 +141,112 @@ ENDPROC(ret_from_fork)
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#endif
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#endif
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#ifdef CONFIG_DYNAMIC_FTRACE
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ENTRY(__gnu_mcount_nc)
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mov ip, lr
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ldmia sp!, {lr}
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mov pc, ip
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ENDPROC(__gnu_mcount_nc)
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ENTRY(ftrace_caller)
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stmdb sp!, {r0-r3, lr}
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mov r0, lr
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sub r0, r0, #MCOUNT_INSN_SIZE
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ldr r1, [sp, #20]
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.global ftrace_call
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ftrace_call:
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bl ftrace_stub
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ldmia sp!, {r0-r3, ip, lr}
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mov pc, ip
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ENDPROC(ftrace_caller)
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#ifdef CONFIG_OLD_MCOUNT
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ENTRY(mcount)
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stmdb sp!, {lr}
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ldr lr, [fp, #-4]
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ldmia sp!, {pc}
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ENDPROC(mcount)
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ENTRY(ftrace_caller_old)
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stmdb sp!, {r0-r3, lr}
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ldr r1, [fp, #-4]
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mov r0, lr
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sub r0, r0, #MCOUNT_INSN_SIZE
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.globl ftrace_call_old
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ftrace_call_old:
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bl ftrace_stub
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ldr lr, [fp, #-4] @ restore lr
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ldmia sp!, {r0-r3, pc}
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ENDPROC(ftrace_caller_old)
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#endif
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#else
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ENTRY(__gnu_mcount_nc)
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stmdb sp!, {r0-r3, lr}
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.macro __mcount suffix
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mcount_enter
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ldr r0, =ftrace_trace_function
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ldr r2, [r0]
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adr r0, .Lftrace_stub
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cmp r0, r2
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bne gnu_trace
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ldmia sp!, {r0-r3, ip, lr}
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mov pc, ip
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bne 1f
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mcount_exit
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gnu_trace:
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ldr r1, [sp, #20] @ lr of instrumented routine
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mov r0, lr
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1: mcount_get_lr r1 @ lr of instrumented func
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mov r0, lr @ instrumented function
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sub r0, r0, #MCOUNT_INSN_SIZE
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adr lr, BSYM(1f)
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adr lr, BSYM(2f)
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mov pc, r2
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1:
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ldmia sp!, {r0-r3, ip, lr}
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mov pc, ip
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ENDPROC(__gnu_mcount_nc)
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2: mcount_exit
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.endm
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.macro __ftrace_caller suffix
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mcount_enter
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mcount_get_lr r1 @ lr of instrumented func
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mov r0, lr @ instrumented function
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sub r0, r0, #MCOUNT_INSN_SIZE
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.globl ftrace_call\suffix
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ftrace_call\suffix:
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bl ftrace_stub
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mcount_exit
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.endm
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#ifdef CONFIG_OLD_MCOUNT
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/*
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* This is under an ifdef in order to force link-time errors for people trying
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* to build with !FRAME_POINTER with a GCC which doesn't use the new-style
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* mcount.
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* mcount
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*/
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ENTRY(mcount)
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stmdb sp!, {r0-r3, lr}
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ldr r0, =ftrace_trace_function
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ldr r2, [r0]
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adr r0, ftrace_stub
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cmp r0, r2
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bne trace
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ldr lr, [fp, #-4] @ restore lr
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ldmia sp!, {r0-r3, pc}
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trace:
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ldr r1, [fp, #-4] @ lr of instrumented routine
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mov r0, lr
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sub r0, r0, #MCOUNT_INSN_SIZE
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mov lr, pc
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mov pc, r2
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ldr lr, [fp, #-4] @ restore lr
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.macro mcount_enter
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stmdb sp!, {r0-r3, lr}
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.endm
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.macro mcount_get_lr reg
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ldr \reg, [fp, #-4]
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.endm
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.macro mcount_exit
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ldr lr, [fp, #-4]
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ldmia sp!, {r0-r3, pc}
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.endm
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ENTRY(mcount)
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#ifdef CONFIG_DYNAMIC_FTRACE
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stmdb sp!, {lr}
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ldr lr, [fp, #-4]
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ldmia sp!, {pc}
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#else
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__mcount _old
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#endif
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ENDPROC(mcount)
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#ifdef CONFIG_DYNAMIC_FTRACE
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ENTRY(ftrace_caller_old)
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__ftrace_caller _old
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ENDPROC(ftrace_caller_old)
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#endif
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#endif /* CONFIG_DYNAMIC_FTRACE */
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.purgem mcount_enter
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.purgem mcount_get_lr
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.purgem mcount_exit
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#endif
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/*
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* __gnu_mcount_nc
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*/
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.macro mcount_enter
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stmdb sp!, {r0-r3, lr}
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.endm
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.macro mcount_get_lr reg
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ldr \reg, [sp, #20]
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.endm
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.macro mcount_exit
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ldmia sp!, {r0-r3, ip, lr}
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mov pc, ip
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.endm
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ENTRY(__gnu_mcount_nc)
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#ifdef CONFIG_DYNAMIC_FTRACE
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mov ip, lr
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ldmia sp!, {lr}
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mov pc, ip
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#else
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__mcount
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#endif
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ENDPROC(__gnu_mcount_nc)
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#ifdef CONFIG_DYNAMIC_FTRACE
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ENTRY(ftrace_caller)
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__ftrace_caller
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ENDPROC(ftrace_caller)
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#endif
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.purgem mcount_enter
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.purgem mcount_get_lr
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.purgem mcount_exit
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ENTRY(ftrace_stub)
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.Lftrace_stub:
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