| Sandrine Bailleux | 3cd87d7 | 2018-10-09 11:12:55 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2018, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #ifndef __ASM_MACROS_COMMON_S__ |
| 8 | #define __ASM_MACROS_COMMON_S__ |
| 9 | |
| 10 | /* |
| 11 | * This macro is used to create a function label and place the |
| 12 | * code into a separate text section based on the function name |
| 13 | * to enable elimination of unused code during linking. It also adds |
| 14 | * basic debug information to enable call stack printing most of the |
| 15 | * time. |
| 16 | */ |
| 17 | .macro func _name |
| 18 | /* |
| 19 | * Add Call Frame Information entry in the .debug_frame section for |
| 20 | * debugger consumption. This enables callstack printing in debuggers. |
| 21 | * This does not use any space in the final loaded binary, only in the |
| 22 | * ELF file. |
| 23 | * Note that a function manipulating the CFA pointer location (i.e. the |
| 24 | * x29 frame pointer on AArch64) should declare it using the |
| 25 | * appropriate .cfi* directives, or be prepared to have a degraded |
| 26 | * debugging experience. |
| 27 | */ |
| 28 | .cfi_sections .debug_frame |
| 29 | .section .text.\_name, "ax" |
| 30 | .type \_name, %function |
| 31 | .func \_name |
| 32 | /* |
| 33 | * .cfi_startproc and .cfi_endproc are needed to output entries in |
| 34 | * .debug_frame |
| 35 | */ |
| 36 | .cfi_startproc |
| 37 | \_name: |
| 38 | .endm |
| 39 | |
| 40 | /* |
| 41 | * This macro is used to mark the end of a function. |
| 42 | */ |
| 43 | .macro endfunc _name |
| 44 | .endfunc |
| 45 | .cfi_endproc |
| 46 | .size \_name, . - \_name |
| 47 | .endm |
| 48 | |
| 49 | /* |
| 50 | * This macro declares an array of 1 or more stacks, properly |
| 51 | * aligned and in the requested section |
| 52 | */ |
| 53 | #define STACK_ALIGN 6 |
| 54 | |
| 55 | .macro declare_stack _name, _section, _size, _count |
| 56 | .if ((\_size & ((1 << STACK_ALIGN) - 1)) <> 0) |
| 57 | .error "Stack size not correctly aligned" |
| 58 | .endif |
| 59 | .section \_section, "aw", %nobits |
| 60 | .align STACK_ALIGN |
| 61 | \_name: |
| 62 | .space ((\_count) * (\_size)), 0 |
| 63 | .endm |
| 64 | |
| 65 | #endif /* __ASM_MACROS_COMMON_S__ */ |
| 66 | |