By David Seal
This can be the authoritative reference advisor to the ARM RISC structure. Produced by means of the architects which are actively engaged on the ARM specification, the ebook comprises designated information regarding all types of the ARM and Thumb guideline units, the reminiscence administration and cache services, in addition to optimized code examples.
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Extra info for ARM Architecture Reference Manual
Programming techniques that involve the use of self-modifying code are to be avoided as far as possible. Instruction Memory Barriers (IMBs) In many systems, however, it is impossible to avoid the use of self-modifying code entirely. For example, any system which allows a program to be loaded into memory and then executed is using self-modifying code. Each implementation therefore defines a sequence of operations that can be used in the middle of a self-modifying code sequence to make it execute reliably.
However, there are such instructions in the Thumb instruction set, as described in Chapter A6 The Thumb Instruction Set. Each exception mode has its own banked version of R13, which should normally be initialized to point to a stack dedicated to that exception mode. On entry, the exception handler typically stores to this stack the values of other registers to be used. By reloading these values into the registers when it returns, the exception handler can ensure that it does not corrupt the state of the program that was being executed when the exception occurred.
It cannot use 8 for some of them and 12 for others. Because of this exception, it is usually best to avoid the use of STR and STM instructions that store R15. If this is difficult, use a suitable instruction sequence in the program to ascertain which offset the implementation uses. For example, if R0 points to an available word of memory, then the following instructions put the offset of the implementation in R0: SUB STR LDR SUB R1, PC, R0, R0, PC, #4 [R0] [R0] R0, R1 ; ; ; ; R1 = address of following STR instruction Store address of STR instruction + offset, then reload it Calculate the offset as the difference Note The rules about how R15 is read apply only to reads by instructions.