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ARM assembly "retne" instruction


ARM assembly "retne" instruction

By : user2949723
Date : November 17 2020, 04:28 AM
Any of those help The architectural assembly language is one thing, real world code is another. Once assembler pseudo-ops and macros come into play, a familiarity with both the toolchain and the codebase in question helps a lot. Linux is particularly nasty as much of the assembly source contains multiple layers of both assembler macros and CPP macros. If you know what to look for, and follow the header trail to arch/arm/include/asm/assembler.h, you eventually find this complicated beast:
code :
.irp    c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
.macro  ret\c, reg
#if __LINUX_ARM_ARCH__ < 6
        mov\c   pc, \reg
#else
        .ifeqs  "\reg", "lr"
        bx\c    \reg
        .else
        mov\c   pc, \reg
        .endif
#endif
        .endm
        .endr


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How do you pass a string as an argument to the "call" instruction in inline assembly?

How do you pass a string as an argument to the "call" instruction in inline assembly?


By : Mago Pato
Date : March 29 2020, 07:55 AM
To fix this issue You can't, at least not directly.
call takes an address as a parameter. Even though you write "call functionName", the linker replaces functionname with the actual address of the function. You'd need to first map that string to its address. In general, C and C++ don't support any sort of runtime metadata about function name mappings that would allow for this. If the function is exported from a DLL, you can use GetProcAddress to find its address.
code :
std:map<string, PVOID> functionMappings;
functionMappings["MyFunction"] = MyFunction;


// Later


PVOID function = functionMappings["MyFunction"];

__asm
{
    push a;
    call [function]
}
What does "rep; nop;" mean in x86 assembly? Is it the same as the "pause" instruction?

What does "rep; nop;" mean in x86 assembly? Is it the same as the "pause" instruction?


By : user3425797
Date : March 29 2020, 07:55 AM
This might help you rep; nop is indeed the same as the pause instruction (opcode F390). It might be used for assemblers which don't support the pause instruction yet. On previous processors, this simply did nothing, just like nop but in two bytes. On new processors which support hyperthreading, it is used as a hint to the processor that you are executing a spinloop to increase performance. From Intel's instruction reference:
"Illegal instruction" on basic assembly program - not even hello world - why is linking needed?

"Illegal instruction" on basic assembly program - not even hello world - why is linking needed?


By : New Richmond
Date : March 29 2020, 07:55 AM
this will help You do need to link it to create an executable. By default, as just gives you an object file, which is something you can link into an executable (either with other object files or on its own) but is not itself a valid executable. Try:
code :
as -arch i386 -o file.o file.s
ld -o file file.o
as -arch i386 -o $1.o $1.s
ld -o $1 $1.o
How is the "update condition flags" S encoded in the 16-bit Thumb-2 assembly instruction set?

How is the "update condition flags" S encoded in the 16-bit Thumb-2 assembly instruction set?


By : Sujit Barua
Date : March 29 2020, 07:55 AM
Hope this helps Thumb doesn't use the S condition field for each instruction, so every instruction is unconditional (aside from the conditional branches, obviously). Part of the reduction from 32-bit ARM to 16-bit Thumb involved getting rid of it. The examples you provided shouldn't have the s to begin with, in my opinion (they don't get used in this manual).
Condition codes in Thumb are set implicitly by your ALU instructions (same as ARM), but to access them you need to use conditional branches.
x86 assembly extreme novice inquiry: "invalid instruction operands"?

x86 assembly extreme novice inquiry: "invalid instruction operands"?


By : Dmitrii HolmoGorov
Date : March 29 2020, 07:55 AM
wish helps you One possible solution would be to replace inputLoopCounter BYTE -1 by inputLoopCounter DWORD -1.
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