projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3402aac7 | 1 | #------------------------------------------------------------------------------\r |
| 1e57a462 | 2 | #\r |
| 3 | # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
| 4 | #\r | |
| 5 | # This program and the accompanying materials\r | |
| 6 | # are licensed and made available under the terms and conditions of the BSD License\r | |
| 7 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | # http://opensource.org/licenses/bsd-license.php\r | |
| 9 | #\r | |
| 10 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | #\r | |
| 13 | #------------------------------------------------------------------------------\r | |
| 14 | \r | |
| 22b080c7 | 15 | #include <AsmMacroIoLib.h>\r |
| 1e57a462 | 16 | \r |
| 17 | /*\r | |
| 18 | Semihosting operation request mechanism\r | |
| 3402aac7 | 19 | \r |
| 1e57a462 | 20 | SVC 0x123456 in ARM state (for all architectures)\r |
| 21 | SVC 0xAB in Thumb state (excluding ARMv7-M)\r | |
| 22 | BKPT 0xAB for ARMv7-M (Thumb-2 only)\r | |
| 3402aac7 RC |
23 | \r |
| 24 | R0 - operation type\r | |
| 1e57a462 | 25 | R1 - block containing all other parametes\r |
| 3402aac7 RC |
26 | \r |
| 27 | lr - must be saved as svc instruction will cause an svc exception and write\r | |
| 1e57a462 | 28 | the svc lr register. That happens to be the one we are using, so we must\r |
| 3402aac7 | 29 | save it or we will not be able to return.\r |
| 1e57a462 | 30 | */\r |
| 22b080c7 | 31 | ASM_FUNC(GccSemihostCall)\r |
| 3402aac7 RC |
32 | stmfd sp!, {lr}\r |
| 33 | svc #0x123456\r | |
| 7d952405 | 34 | ldmfd sp!, {lr}\r |
| 1e57a462 | 35 | bx lr\r |
| 36 | \r | |
| 37 | \r |