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Using the Inline and Embedded Assemblers of the AR
Compiler support for inline assembly language
Inline assembler support in the compiler
Restrictions on inline assembler support in the co
Inline assembly language syntax with the __asm key
Inline assembly language syntax with the asm keywo
Inline assembler rules for compiler keywords __asm
Restrictions on inline assembly operations in C an
Inline assembler register restrictions in C and C+
Inline assembler processor mode restrictions in C
Inline assembler Thumb instruction set restriction
Inline assembler Vector Floating-Point (VFP) restr
Inline assembler instruction restrictions in C and
Miscellaneous inline assembler restrictions in C a
Inline assembler and register access in C and C++
Inline assembler and the # constant expression spe
Inline assembler and instruction expansion in C an
Expansion of inline assembler instructions that us
Expansion of inline assembler load and store instr
Inline assembler effect on processor condition fla
Inline assembler operands in C and C++ code
Inline assembler expression operands in C and C++
Inline assembler register list operands in C and C
Inline assembler intermediate operands in C and C+
Inline assembler function calls and branches in C
Behavior of BL and SVC without optional lists in C
Inline assembler BL and SVC input parameter list i
Inline assembler BL and SVC output value list in C
Inline assembler BL and SVC corrupted register lis
Inline assembler branches and labels in C and C++
Inline assembler and virtual registers
Embedded assembler support in the compiler
Embedded assembler syntax in C and C++
Effect of compiler ARM and Thumb states on embedde
Restrictions on embedded assembly language functio
Compiler generation of embedded assembly language
Access to C and C++ compile-time constant expressi
Differences between expressions in embedded assemb
Manual overload resolution in embedded assembler
__offsetof_base keyword for related base classes i
Compiler-supported keywords for calling class memb
__mcall_is_virtual(D, f)
__mcall_is_in_vbase(D, f)
__mcall_offsetof_vbase(D, f)
__mcall_this_offset(D, f)
__vcall_offsetof_vfunc(D, f)
Calling nonstatic member functions in embedded ass
Calling a nonvirtual member function
Calling a virtual member function
Legacy inline assembler that accesses sp, lr, or p
Accessing sp (r13), lr (r14), and pc (r15) in lega
Differences in compiler support of inline and embe
Compiler User Guide
Effect of compiler ARM and Thumb states on embedded assembler
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| Home > Using the Inline and Embedded Assemblers of the ARM Compiler > Effect of compiler ARM and Thumb states on embedded assembler | |||
The initial state of the embedded assembler, ARM or Thumb state, is determined by the initial state of the compiler, as specified on the command line. This means that:
if the compiler starts in ARM state, the embedded assembler uses
--armif the compiler starts in Thumb state, the embedded assembler uses
--thumb.
The embedded assembler state at the start of each function
is as set by the invocation of the compiler, as modified by #pragma
arm and #pragma thumb pragmas.
You can change the state of the embedded assembler within
a function by using explicit ARM, THUMB,
or CODE16 directives in the embedded assembler function.
Such a directive within an __asm function does
not affect the ARM or Thumb state of subsequent __asm functions.
If you are compiling for a 32-bit Thumb capable processor, you can use 32-bit Thumb instructions when in Thumb state.
See also| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0375D |
| Non-Confidential | ID062912 |
 PDF version | |
| Home > Using the Inline and Embedded Assemblers of the ARM Compiler > Effect of compiler ARM and Thumb states on embedded assembler |
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