| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| .macro zircon_syscall num, name, caller |
| mov $\num, %eax |
| syscall |
| // This symbol at the return address identifies this as an approved call site. |
| .hidden CODE_SYSRET_\name\()_VIA_\caller |
| CODE_SYSRET_\name\()_VIA_\caller\(): |
| // The `nop` exists due to the difference in instruction size between `syscall` |
| // (2 bytes) and `vmcall` (3 bytes). The `nop` padding allows us to patch the |
| // vDSO code to use `vmcall` instead of `syscall`. |
| nop |
| .endm |
| |
| // CFI aware push and pop macros. |
| .macro push_reg reg |
| push \reg |
| .cfi_adjust_cfa_offset 8 |
| .cfi_rel_offset \reg, 0 |
| .endm |
| .macro pop_reg reg |
| pop \reg |
| .cfi_adjust_cfa_offset -8 |
| .cfi_same_value \reg |
| .endm |
