| #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 |