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#include "../builtins/assembly.h"
.syntax unified
.arch armv6t2
.fpu vfpv2
.code 32
.global _ZN6__xray19XRayPatchedFunctionE
@ Word-aligned function entry point
.p2align 2
@ Let C/C++ see the symbol
.global __xray_FunctionEntry
@ It preserves all registers except r0, r12(ip), r14(lr) and r15(pc)
@ Assume that "q" part of the floating-point registers is not used
@ for passing parameters to C/C++ functions.
.type __xray_FunctionEntry, %function
@ In C++ it is void extern "C" __xray_FunctionEntry(uint32_t FuncId) with
@ FuncId passed in r0 register.
__xray_FunctionEntry:
PUSH {r1-r3,lr}
@ Save floating-point parameters of the instrumented function
VPUSH {d0-d7}
MOVW r1,#:lower16:_ZN6__xray19XRayPatchedFunctionE
MOVT r1,#:upper16:_ZN6__xray19XRayPatchedFunctionE
LDR r2, [r1]
@ Handler address is nullptr if handler is not set
CMP r2, #0
BEQ FunctionEntry_restore
@ Function ID is already in r0 (the first parameter).
@ r1=0 means that we are tracing an entry event
MOV r1, #0
@ Call the handler with 2 parameters in r0 and r1
BLX r2
FunctionEntry_restore:
@ Restore floating-point parameters of the instrumented function
VPOP {d0-d7}
POP {r1-r3,pc}
@ Word-aligned function entry point
.p2align 2
@ Let C/C++ see the symbol
.global __xray_FunctionExit
@ Assume that d1-d7 are not used for the return value.
@ Assume that "q" part of the floating-point registers is not used for the
@ return value in C/C++.
.type __xray_FunctionExit, %function
@ In C++ it is extern "C" void __xray_FunctionExit(uint32_t FuncId) with
@ FuncId passed in r0 register.
__xray_FunctionExit:
PUSH {r1-r3,lr}
@ Save the floating-point return value of the instrumented function
VPUSH {d0}
@ Load the handler address
MOVW r1,#:lower16:_ZN6__xray19XRayPatchedFunctionE
MOVT r1,#:upper16:_ZN6__xray19XRayPatchedFunctionE
LDR r2, [r1]
@ Handler address is nullptr if handler is not set
CMP r2, #0
BEQ FunctionExit_restore
@ Function ID is already in r0 (the first parameter).
@ 1 means that we are tracing an exit event
MOV r1, #1
@ Call the handler with 2 parameters in r0 and r1
BLX r2
FunctionExit_restore:
@ Restore the floating-point return value of the instrumented function
VPOP {d0}
POP {r1-r3,pc}
@ Word-aligned function entry point
.p2align 2
@ Let C/C++ see the symbol
.global __xray_FunctionTailExit
@ It preserves all registers except r0, r12(ip), r14(lr) and r15(pc)
@ Assume that "q" part of the floating-point registers is not used
@ for passing parameters to C/C++ functions.
.type __xray_FunctionTailExit, %function
@ In C++ it is void extern "C" __xray_FunctionTailExit(uint32_t FuncId)
@ with FuncId passed in r0 register.
__xray_FunctionTailExit:
PUSH {r1-r3,lr}
@ Save floating-point parameters of the instrumented function
VPUSH {d0-d7}
MOVW r1,#:lower16:_ZN6__xray19XRayPatchedFunctionE
MOVT r1,#:upper16:_ZN6__xray19XRayPatchedFunctionE
LDR r2, [r1]
@ Handler address is nullptr if handler is not set
CMP r2, #0
BEQ FunctionTailExit_restore
@ Function ID is already in r0 (the first parameter).
@ r1=2 means that we are tracing a tail exit event
@ But before the logging part of XRay is ready, we pretend that here a
@ normal function exit happens, so we give the handler code 1
MOV r1, #1
@ Call the handler with 2 parameters in r0 and r1
BLX r2
FunctionTailExit_restore:
@ Restore floating-point parameters of the instrumented function
VPOP {d0-d7}
POP {r1-r3,pc}
NO_EXEC_STACK_DIRECTIVE
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