projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 58e92b39 AB |
1 | //\r |
| 2 | // Copyright (c) 2012-2014, ARM Limited. All rights reserved.\r | |
| 3 | // Copyright (c) 2014, Linaro Limited. All rights reserved.\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 3\r | |
| 17 | .arch_extension virt\r | |
| 18 | \r | |
| 19 | GCC_ASM_EXPORT(ArmCallHvc)\r | |
| 20 | \r | |
| 21 | ASM_PFX(ArmCallHvc):\r | |
| 22 | push {r4-r8}\r | |
| 23 | // r0 will be popped just after the HVC call\r | |
| 24 | push {r0}\r | |
| 25 | \r | |
| 26 | // Load the HVC arguments values into the appropriate registers\r | |
| 27 | ldr r7, [r0, #28]\r | |
| 28 | ldr r6, [r0, #24]\r | |
| 29 | ldr r5, [r0, #20]\r | |
| 30 | ldr r4, [r0, #16]\r | |
| 31 | ldr r3, [r0, #12]\r | |
| 32 | ldr r2, [r0, #8]\r | |
| 33 | ldr r1, [r0, #4]\r | |
| 34 | ldr r0, [r0, #0]\r | |
| 35 | \r | |
| 36 | hvc #0\r | |
| 37 | \r | |
| 38 | // Pop the ARM_HVC_ARGS structure address from the stack into r8\r | |
| 39 | pop {r8}\r | |
| 40 | \r | |
| 41 | // Load the HVC returned values into the appropriate registers\r | |
| 42 | // A HVC call can return up to 4 values - we do not need to store back r4-r7.\r | |
| 43 | str r3, [r8, #12]\r | |
| 44 | str r2, [r8, #8]\r | |
| 45 | str r1, [r8, #4]\r | |
| 46 | str r0, [r8, #0]\r | |
| 47 | \r | |
| 48 | mov r0, r8\r | |
| 49 | \r | |
| 50 | // Restore the registers r4-r8\r | |
| 51 | pop {r4-r8}\r | |
| 52 | \r | |
| 53 | bx lr\r |