| #------------------------------------------------------------------------------ | |
| # | |
| # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> | |
| # | |
| # SPDX-License-Identifier: BSD-2-Clause-Patent | |
| # | |
| #------------------------------------------------------------------------------ | |
| #include <AsmMacroIoLib.h> | |
| /* | |
| Semihosting operation request mechanism | |
| SVC 0x123456 in ARM state (for all architectures) | |
| SVC 0xAB in Thumb state (excluding ARMv7-M) | |
| BKPT 0xAB for ARMv7-M (Thumb-2 only) | |
| R0 - operation type | |
| R1 - block containing all other parametes | |
| lr - must be saved as svc instruction will cause an svc exception and write | |
| the svc lr register. That happens to be the one we are using, so we must | |
| save it or we will not be able to return. | |
| */ | |
| ASM_FUNC(GccSemihostCall) | |
| stmfd sp!, {lr} | |
| svc #0x123456 | |
| ldmfd sp!, {lr} | |
| bx lr | |