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doc: initial draft of Assembly coding guidelines
This patch creates initial draft of Assembly coding guidelines. Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
This commit is contained in:
Shiqing Gao
wenlingz
parent
dd1830b823
commit
72d79a5fee
792
doc/developer-guides/asm_coding_guidelines.rst
Normal file
792
doc/developer-guides/asm_coding_guidelines.rst
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@ -0,0 +1,792 @@
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.. _asm_coding_guidelines:
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Assembly Language Coding Guidelines
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###################################
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.. contents::
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:local:
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General
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*******
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ASM-GN-01: One address shall not be declared by two labels
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==========================================================
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Compliant example::
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asm_showcase_1:
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movl $0x1, %eax
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_showcase_1:
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asm_showcase_2:
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movl $0x1, %eax
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ASM-GN-02: Names reserved for use by the assembler shall not be used for any other purpose
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==========================================================================================
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Names defined by developers shall not be the same as an assembler directive,
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instruction prefix, instruction mnemonic, or register name.
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Compliant example::
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asm_showcase_1:
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movl $0x1, %eax
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asm_showcase_2:
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movl $0x2, %eax
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asm_showcase_3:
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movl $0x3, %eax
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.. rst-class:: non-compliant-code
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Non-compliant example::
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text:
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movl $0x1, %eax
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mov:
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movl $0x2, %eax
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eax:
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movl $0x3, %eax
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ASM-GN-03: All declared labels shall be used
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============================================
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Otherwise, the label shall be removed.
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Compliant example::
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asm_showcase_1:
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movl $0x1, %eax
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jmp asm_showcase_2
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/* do something */
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asm_showcase_2:
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movl $0x2, %eax
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_showcase_1:
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movl $0x1, %eax
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/*
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* 'asm_showcase_2' is not used anywhere, including
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* all C source/header files and Assembly files.
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*/
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asm_showcase_2:
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movl $0x2, %eax
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ASM-GN-04: Magic numbers shall be used with restrictions
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========================================================
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Only the following cases shall be allowed:
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a) The magic number is defined as a MACRO with a name clearly indicating its
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meaning.
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b) The meaning of the magic number is clearly documented in the comments before
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its usage.
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c) The meaning of the magic number is straightforward in the specific context.
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Compliant example::
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.section .data
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showcase_data:
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/* 0xff000000 means <something> */
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.long 0xff000000
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.. rst-class:: non-compliant-code
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Non-compliant example::
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.section .data
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showcase_data:
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.long 0xff000000
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ASM-GN-05: Parentheses shall be used to set the operator precedence explicitly
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==============================================================================
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Compliant example::
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.section .data
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showcase_data:
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/* 0x1234 means <something> */
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.long 0x1234 * (0x1234 >> 2)
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.. rst-class:: non-compliant-code
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Non-compliant example::
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.section .data
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showcase_data:
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/* 0x1234 means <something> */
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.long 0x1234 * 0x1234 >> 2
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ASM-GN-06: .end directive statement shall be the last statement in an Assembly file
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===================================================================================
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This rule only applies to the Assembly file which uses .end directive. .end
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directive shall be the last statement in this case. All the statements past .end
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directive will not be processed by the assembler.
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Compliant example::
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#include <types.h>
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#include <spinlock.h>
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.macro asm_showcase_mov
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movl $0x1, %eax
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.endm
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.end
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.. rst-class:: non-compliant-code
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Non-compliant example::
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#include <types.h>
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.end
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#include <spinlock.h>
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.macro asm_showcase_mov
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movl $0x1, %eax
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.endm
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ASM-GN-07: Infinite loop shall not exist
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========================================
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Compliant example::
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asm_showcase_1:
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movl $0x1, %eax
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jmp asm_showcase_2
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/* do something */
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asm_showcase_2:
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movl $0x2, %eax
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_showcase_1:
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movl $0x1, %eax
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jmp asm_showcase_1
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ASM-GN-08: All code shall be reachable
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======================================
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Compliant example::
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asm_showcase:
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movl %ebx, %eax
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test $0x400, %eax
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jne asm_test
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movl $0x2, %eax
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movl $0x3, %eax
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asm_test:
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movl $0x6, %eax
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_showcase:
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movl %ebx, %eax
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jmp asm_test
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/* the following two lines have no chance to be executed */
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movl $0x2, %eax
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movl $0x3, %eax
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asm_test:
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movl $0x6, %eax
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ASM-GN-09: Far jump shall be used with restrictions
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===================================================
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Jumping to an instruction located in a different segment shall only be used for
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the following two cases:
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a) Code bit changes, such as change from 32-bit mode to 64-bit mode.
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b) System resumes from S3. In this case, Global Descriptor Table (GDT) is set by
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Bootloader/BIOS and far jump has to be used to correct the Code Segment (CS).
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Compliant example::
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.code32
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execution_32:
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/*
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* do something in 32-bit mode,
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* then,
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* perform a far jump to start executing in 64-bit mode
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*/
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ljmp $0x0008, $execution_64_2
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.code64
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execution_64_1:
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/* do something in 64-bit mode */
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execution_64_2:
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/* do something in 64-bit mode */
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.. rst-class:: non-compliant-code
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Non-compliant example::
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.data
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asm_showcase_data:
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.word 0x0008
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.code32
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execution_32:
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/* do something in 32-bit mode */
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ljmp $0x0008, $asm_showcase_data
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ASM-GN-10: Assembler directives shall be used with restrictions
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===============================================================
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Usage of the assembler directive refers to GNU assembler 'as' user manual. Only
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the following assembler directives may be used:
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1) .align
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2) .end
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3) .extern
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4) repeat related directives, including .rept and .endr
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5) global related directives, including .global and .globl
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6) macro related directives, including .altmacro, .macro, and .endm
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7) code bit related directives, including .code16, .code32, and .code64
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8) section related directives, including .section, .data, and .text
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9) number emission related directives, including .byte, .word, .short, .long,
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and .quad
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10) .org, which shall be used with restrictions. It shall only be used to
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advance the location counter due to code bit changes, such as change from 32-bit
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mode to 64-bit mode.
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Functions
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*********
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ASM-FN-01: Function shall have return statement
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===============================================
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Compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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ASM-FN-02: A function shall only have one entry point
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=====================================================
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The label in a function shall only be used inside. Jumping into the function
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from outside via this label shall not be allowed. This rule applies to both
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conditional jump and unconditional jump.
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Compliant example::
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asm_func_showcase:
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test $0x400, %eax
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jne tmp
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movl $0x1, %eax
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tmp:
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movl $0x2, %eax
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_func_showcase:
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movl $0x1, %eax
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tmp:
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movl $0x2, %eax
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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jmp tmp
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ASM-FN-03: A function shall only have one return statement
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==========================================================
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Compliant example::
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asm_func_showcase:
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test $0x400, %eax
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jne tmp
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movl $0x2, %eax
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jmp showcase_return
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tmp:
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movl $0x3, %eax
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showcase_return:
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ret
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_func_showcase:
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test $0x400, %eax
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jne tmp
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movl $0x2, %eax
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ret
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tmp:
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movl $0x3, %eax
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ret
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ASM-FN-04: Function shall only be entered by explicit call
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==========================================================
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Falling through from prior instruction shall not be allowed.
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Compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_showcase:
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movl $0x1, %eax
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asm_func_showcase:
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movl $0x2, %eax
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ret
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ASM-FN-05: A jump instruction shall not be used to jump out of a function
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=========================================================================
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This rule applies to both conditional jump and unconditional jump.
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Compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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jmp asm_test
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ret
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asm_showcase:
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movl $0x1, %ebx
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call asm_func_showcase
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asm_test:
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cli
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ASM-FN-06: Recursion shall not be used in function calls
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========================================================
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Compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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.. rst-class:: non-compliant-code
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Non-compliant example::
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asm_func_showcase:
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movl $0x2, %eax
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call asm_func_showcase
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ret
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asm_showcase:
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movl $0x1, %eax
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call asm_func_showcase
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ASM-FN-07: Cyclomatic complexity shall be less than 10
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======================================================
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A function with cyclomatic complexity greater than 10 shall be split into
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multiple sub-functions to simplify the function logic.
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Compliant example::
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asm_func_showcase:
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/* do something */
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cmpl $0x0, %eax
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je tmp
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cmpl $0x1, %eax
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je tmp
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cmpl $0x2, %eax
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je tmp
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/* do something */
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tmp:
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/* do something */
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ret
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.. rst-class:: non-compliant-code
|
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Non-compliant example::
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asm_func_showcase:
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/* do something */
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cmpl $0x0, %eax
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je tmp
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cmpl $0x1, %eax
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je tmp
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cmpl $0x2, %eax
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je tmp
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cmpl $0x3, %eax
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je tmp
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cmpl $0x4, %eax
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je tmp
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cmpl $0x5, %eax
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je tmp
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cmpl $0x6, %eax
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je tmp
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cmpl $0x7, %eax
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je tmp
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cmpl $0x8, %eax
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je tmp
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cmpl $0x9, %eax
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je tmp
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cmpl $0xa, %eax
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je tmp
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cmpl $0xb, %eax
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je tmp
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cmpl $0xc, %eax
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je tmp
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cmpl $0xd, %eax
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je tmp
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cmpl $0xe, %eax
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je tmp
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/* do something */
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tmp:
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/* do something */
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ret
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Coding Style
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||||
************
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||||
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||||
ASM-CS-01: One instruction statement shall not be split into multiple lines
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||||
===========================================================================
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||||
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||||
Compliant example::
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||||
|
||||
movl $0x2, %eax
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||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
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movl $0x2, \
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%eax
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ASM-CS-02: Assembler directive statements shall be aligned
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==========================================================
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An assembler directive statement is composed of directive and arguments.
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Arguments are optional depending on the use case.
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Some detailed rules about the alignment are listed below:
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a) Assembler directives shall be aligned with one tab if the statement is in the
|
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code block under any label from functional perspective. Otherwise, assembler
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directives shall be aligned to the start of the line.
|
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b) Tabs shall be used to separate the directive and the first argument, where
|
||||
applicable. The number of tabs could be decided by the developers based on each
|
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case and it shall guarantee that the first argument is aligned in each directive
|
||||
block.
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||||
c) A single space shall be used to separate multiple arguments.
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Compliant example::
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.extern cpu_primary_save32
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.extern cpu_primary_save64
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.section multiboot_header, "a"
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.align 4
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.long 0x0008
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.long 0x0018
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||||
.section entry, "ax"
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.align 8
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||||
.code32
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||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
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.extern cpu_primary_save32
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.extern cpu_primary_save64
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||||
.section multiboot_header, "a"
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||||
.align 4
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||||
.long 0x0008
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.long 0x0018
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||||
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.section entry, "ax"
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||||
.align 8
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||||
.code32
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||||
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||||
|
||||
ASM-CS-03: Labels shall be aligned to the start of the line
|
||||
===========================================================
|
||||
|
||||
Compliant example::
|
||||
|
||||
asm_showcase_1:
|
||||
movl $0x1, %eax
|
||||
|
||||
asm_showcase_2:
|
||||
movl $0x2, %eax
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
asm_showcase_1:
|
||||
movl $0x1, %eax
|
||||
|
||||
asm_showcase_2:
|
||||
movl $0x2, %eax
|
||||
|
||||
|
||||
ASM-CS-04: Instruction statements shall be aligned
|
||||
==================================================
|
||||
|
||||
An instruction statement is composed of instruction prefix, instruction
|
||||
mnemonic, and instruction operands. Instruction prefix and instruction operands
|
||||
are optional depending on the use case.
|
||||
Some detailed rules about the alignment are listed below:
|
||||
|
||||
a) The start of instruction statements shall be aligned with one tab if the
|
||||
instruction statement is in the code block under any label from functional
|
||||
perspective. Otherwise, the start of instruction statements shall be aligned to
|
||||
the start of the line. The start of the instruction could either be the
|
||||
instruction mnemonic or the instruction prefix.
|
||||
b) One space shall be used to separate the instruction prefix and the
|
||||
instruction mnemonic, where applicable.
|
||||
c) Tabs shall be used to separate the instruction mnemonic and the first
|
||||
instruction operand, where applicable. The number of tabs could be decided by
|
||||
the developers based on each case and it shall guarantee that the first
|
||||
instruction operand in the code block under one label is aligned.
|
||||
d) A single space shall be used to separate multiple operands.
|
||||
|
||||
Compliant example::
|
||||
|
||||
asm_showcase_1:
|
||||
movl $0x1, %eax
|
||||
lock and %rcx, (%rdx)
|
||||
|
||||
asm_showcase_2:
|
||||
movl $0x3, %eax
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
asm_showcase_1:
|
||||
movl $0x1, %eax
|
||||
lock and %rcx, (%rdx)
|
||||
|
||||
asm_showcase_2:
|
||||
movl $0x2, %eax
|
||||
|
||||
|
||||
ASM-CS-05: '//' shall not be used for comments
|
||||
===============================================
|
||||
|
||||
'/* \*/' shall be used to replace '//' for comments.
|
||||
|
||||
Compliant example::
|
||||
|
||||
/* This is a comment */
|
||||
movl $0x1, %eax
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
// This is a comment
|
||||
movl $0x1, %eax
|
||||
|
||||
|
||||
ASM-CS-06: Tabs shall be 8 characters wide
|
||||
==========================================
|
||||
|
||||
A tab character shall be considered 8-character wide when limiting the line
|
||||
width.
|
||||
|
||||
|
||||
ASM-CS-07: Each line shall contain at most 120 characters
|
||||
=========================================================
|
||||
|
||||
No more than 120 characters shall be on a line, with tab stops every 8
|
||||
characters.
|
||||
|
||||
Compliant example::
|
||||
|
||||
/*
|
||||
* This is a comment. This is a comment. This is a comment. This is a comment.
|
||||
* This is a comment. This is a comment. This is a comment.
|
||||
*/
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
/* This is a comment. This is a comment. This is a comment. This is a comment. This is a comment. This is a comment. This is a comment. */
|
||||
|
||||
|
||||
|
||||
Naming Convention
|
||||
*****************
|
||||
|
||||
ASM-NC-01: Lower case letters shall be used for case insensitive names
|
||||
======================================================================
|
||||
|
||||
This rule applies to assembler directive, instruction prefix, instruction
|
||||
mnemonic, and register name.
|
||||
|
||||
Compliant example::
|
||||
|
||||
.code64
|
||||
lock and %rcx, (%rdx)
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
.CODE64
|
||||
LOCK AND %RCX, (%RDX)
|
||||
|
||||
|
||||
ASM-NC-02: Names defined by developers shall use lower case letters
|
||||
===================================================================
|
||||
|
||||
Names defined by developers shall use lower case letters with the following
|
||||
exception. If an object-like MACRO is defined with '#define', it shall be named
|
||||
with full upper case.
|
||||
|
||||
Compliant example::
|
||||
|
||||
asm_showcase:
|
||||
movl $0x1, %eax
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
ASM_SHOWCASE:
|
||||
movl $0x1, %eax
|
||||
|
||||
|
||||
ASM-NC-03: Label name shall be unique
|
||||
=====================================
|
||||
|
||||
Label name shall be unique with the following exception. Usage of local labels
|
||||
is allowed. Local label is defined with the format 'N:', where N represents any
|
||||
non-negative integer. Using 'Nb' to refer to the most recent previous definition
|
||||
of that label. Using 'Nf' to refer to the next definition of a local label.
|
||||
|
||||
Compliant example::
|
||||
|
||||
asm_showcase_1:
|
||||
movl $0x1, %eax
|
||||
|
||||
asm_showcase_2:
|
||||
movl $0x2, %eax
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
asm_showcase:
|
||||
movl $0x1, %eax
|
||||
|
||||
asm_showcase:
|
||||
movl $0x2, %eax
|
||||
|
||||
|
||||
ASM-NC-04: Names defined by developers shall be less than 31 characters
|
||||
=======================================================================
|
||||
|
||||
Compliant example::
|
||||
|
||||
asm_showcase:
|
||||
movl $0x1, %eax
|
||||
|
||||
.. rst-class:: non-compliant-code
|
||||
|
||||
Non-compliant example::
|
||||
|
||||
asm_showcase_asm_showcase_asm_showcase:
|
||||
movl $0x1, %eax
|
||||
|
||||
|
||||
@ -16,3 +16,4 @@ The following sections document the project's language-specific guidelines:
|
||||
:maxdepth: 1
|
||||
|
||||
c_coding_guidelines
|
||||
asm_coding_guidelines
|
||||
|
||||
Loading…
Reference in New Issue
Block a user