ARM Compiler toolchain v4.1 for ÂµVision Using the Compiler

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Using the Inline and Embedded Assemblers of the ARM Compiler 7.35 Compiler generation of embedded assembly language functions The bodies of all the __asm functions in a translation unit are assembled as if they are concatenated into a single file that is then passed to the ARM assembler. The order of __asm functions in the assembly language file that is passed to the assembler is guaranteed to be the same order as in the source file, except for functions that are generated using a template instantiation. Note This means that it is possible for control to pass from one __asm function to another by falling off the end of the first function into the next __asm function in the file, if the return instruction is omitted. When you invoke armcc, the object file produced by the assembler is combined with the object file of the compiler by a partial link that produces a single object file. The compiler generates an AREA directive for each __asm function, as in Example 7-2: Example 7-2 __asm function #include struct X { int x,y; void addto_y(int); }; __asm void X::addto_y(int) { LDR r2, [r0, #__cpp(offsetof(X, y))] ADD r1, r2, r1 STR r1, [r0, #__cpp(offsetof(X, y))] BX lr } For this function, the compiler generates: AREA ||.emb_text||, CODE, READONLY EXPORT |_ZN1X7addto_yEi| #line num "file" |_ZN1X7addto_yEi| PROC LDR r2, [r0, #4] ADD r1, r2, r1 STR r1, [r0, #4] BX lr ENDP END The use of offsetof must be inside __cpp() because it is the normal offsetof macro from the cstddef header file. Ordinary __asm functions are put in an ELF section with the name .emb_text. That is, embedded assembly functions are never inlined. However, implicitly instantiated template functions and out-of-line copies of inline functions are placed in an area with a name that is derived from the name of the function, and an extra attribute that marks them as common. This ensures that the special semantics of these kinds of functions are maintained. ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 7-41 ID061811 Non-Confidential
Using the Inline and Embedded Assemblers of the ARM Compiler Note Because of the special naming of the area for out-of-line copies of inline functions and template functions, these functions are not in the order of definition, but in an arbitrary order. Therefore, do not assume that code execution falls out of an inline or template function and into another __asm function. 7.35.1 See also Concepts • Compiler support for embedded assembler on page 7-36. Other information • ARM ELF File Format, http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/index.html ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 7-42 ID061811 Non-Confidential
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® ARM Compiler toolchain v4.1 for
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Contents ARM Compiler toolchain v4.
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Contents 5.19 Inline functions ....
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Contents 7.41 __mcall_is_virtual(D,
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Conventions and Feedback • the se
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Overview of the compiler 2.1 The co
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Overview of the compiler 2.3 The C
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Getting started with the Compiler
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Getting started with the Compiler 3
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Getting started with the Compiler
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Getting started with the Compiler R
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Chapter 4 Compiler Features The fol
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Compiler Features 4.1 Compiler intr
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Compiler Features 4.2 Performance b
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Compiler Features 4.4 Generic intri
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Compiler Features 4.10 Compiler sup
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Compiler Features 4.12 Texas Instru
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Compiler Features /* Declare PSR as
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Compiler Features 4.13.1 See also R
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Compiler Features 4.15 Compiler and
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Compiler Features Using the Linker:
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Compiler Features Reference Compile
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Compiler Features 4.19 Compiler sup
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Compiler Features 4.21 PreCompiled
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Compiler Features 4.23 PreCompiled
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Compiler Features Reference Compile
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Compiler Features 4.26 Obsolete Pre
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Compiler Features 4.28 Selectively
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Compiler Features 4.30 Message outp
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Compiler Features 4.32 Default comp
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Compiler Coding Practices • Guard
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Compiler Coding Practices • Exten
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Compiler Coding Practices 5.2 Compi
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Compiler Coding Practices 5.4 Selec
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Compiler Coding Practices In additi
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Compiler Coding Practices Table 5-4
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Compiler Coding Practices Table 5-6
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Compiler Coding Practices 5.9 Code
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Compiler Coding Practices 4. After
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Compiler Coding Practices 5.12 Meth
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Compiler Coding Practices 5.14 Meth
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Compiler Coding Practices 5.16 Func
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Compiler Coding Practices Reference
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Compiler Coding Practices • __val
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Compiler Coding Practices 5.20 Comp
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Compiler Coding Practices 5.21 Auto
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Compiler Coding Practices 5.23 Auto
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Compiler Coding Practices 5.27 Inli
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Compiler Coding Practices 5.28 Inli
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Compiler Coding Practices 5.30 Adva
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Compiler Coding Practices 5.32 Rele
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Compiler Coding Practices 5.34 The
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Compiler Coding Practices 5.36 Perf
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Compiler Coding Practices 5.38 Unal
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Compiler Coding Practices (LDR/STR/
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Compiler Coding Practices • Hexad
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Compiler Coding Practices 5.42 Exam
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Compiler Coding Practices 5.43 Vect
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Compiler Coding Practices 5.45 Impl
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Compiler Coding Practices 5.47 Half
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Compiler Coding Practices 5.49 Type
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Compiler Coding Practices If you us
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Compiler Coding Practices 5.52 Abou
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Compiler Coding Practices 5.54 Iden
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Compiler Coding Practices 5.56 Soft
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Compiler Coding Practices 5.58 Iden
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Compiler Coding Practices 5.59 Soft
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Compiler Coding Practices 5.60.1 Se
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Compiler Coding Practices 5.62 // c
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Compiler Coding Practices 5.64 Desi
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Compiler Coding Practices 5.66 Flex
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Compiler Coding Practices 5.68 inli
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Compiler Coding Practices 5.70 Macr
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Compiler Coding Practices 5.72 New
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Compiler Coding Practices 5.74 Rest
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Compiler Coding Practices 5.78 Exte
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ARM Compiler toolchain v4.1 for ÂµVision Using the Compiler

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