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1e57a462 | 1 | #------------------------------------------------------------------------------ \r |
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 | |
15 | .text\r | |
16 | .align 2\r | |
17 | \r | |
18 | .globl ASM_PFX(GccSemihostCall)\r | |
19 | INTERWORK_FUNC(GccSemihostCall)\r | |
20 | \r | |
21 | /*\r | |
22 | Semihosting operation request mechanism\r | |
23 | \r | |
24 | SVC 0x123456 in ARM state (for all architectures)\r | |
25 | SVC 0xAB in Thumb state (excluding ARMv7-M)\r | |
26 | BKPT 0xAB for ARMv7-M (Thumb-2 only)\r | |
27 | \r | |
28 | R0 - operation type \r | |
29 | R1 - block containing all other parametes\r | |
30 | \r | |
31 | lr - must be saved as svc instruction will cause an svc exception and write \r | |
32 | the svc lr register. That happens to be the one we are using, so we must\r | |
33 | save it or we will not be able to return. \r | |
34 | */\r | |
35 | ASM_PFX(GccSemihostCall):\r | |
7d952405 | 36 | stmfd sp!, {lr} \r |
1e57a462 | 37 | svc #0x123456 \r |
7d952405 | 38 | ldmfd sp!, {lr}\r |
1e57a462 | 39 | bx lr\r |
40 | \r | |
41 | \r |