problem about inline-assembly-Collection of common programming errors

2 years ago
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5 minutes

  • starblue
    gcc assembly x86 inline-assembly
    I’m trying to embed a pointer to a string in the code section using inline assembler. But gcc is adding a $ to the start of the symbol name, causing a link error.Here is a minimal example,static const char str[] = “bar”; int main() {__asm__ __volatile__(“jmp 0f\n\t””.long %0\n\t””0:”:: “i” ( str ));return 0; }building withgcc -Wall -save-temps test.c -o testgives the er

  • Bill the Lizard
    c assembly x86 inline-assembly
    The compare function is a function that takes two arguments a and b and returns an integer describing their order. If a is smaller than b, the result is some negative integer. If a is bigger than b, the result is some positive integer. Otherwise, a and b are equal, and the result is zero.This function is often used to parametrize sorting and searching algorithms fr

  • Ambroz Bizjak
    gcc assembly inline-assembly avr
    Output register in inline assembly must be declared with the “=” constraint, meaning “write-only” [1]. What exactly does this mean – is it truly forbidden to read and modify them within the assembly? For example, consider

  • Brooks Moses
    c++ gcc assembly inline-assembly
    Hello Everyone I want to execute an inline assembly instruction that is of the following form BLENDPD xmm1,xmm2/m128, imm8I am new to inline assembly so i am having some difficulties. my code is:#include using namespace std; int main()

  • guitar-
    c++ inline-assembly
    I get a different return value each time, so I’m doing something wrong. If I replace the add with a basic inc, it returns correctly.Here is the code.#define WIN32_LEAN_AND_MEAN#include #include using namespace std;int Add

  • SSpoke
    c++ inline-assembly boolean
    Say I got something like this..bool isPatched;I have a few other GUI’s where I set isPatched= true; and isPatched= false;, isPatched = !isPatched;void _

  • skaffman
    gcc inline-assembly
    I want to move the value of the variable “userstack” inside the ESP register and then do an absolute jump to the memory address contained in the variable “loc

  • Paul R
    c assembly x86 inline-assembly
    I’m trying to call an assembly function from c,but i keep getting errors..text.globl integrate.type integrate, @function integrate:push %ebpmov %esp, %ebpmov $0,%edi start_loop: cmp %edi,1024 je loop_exitmov 8(%ebp),%eax mov 12(%ebp),%ecx sub %eax,%ecx

  • Piotr Wojtaszczyk
    c gcc assembly inline-assembly avr
    I want to replace the highest byte of 32bit value with inline assembly, following code writes buffer to FRAM memory with spi interace:#define _load_op_code(op_code, addr)\__asm__ __volatile__ (\”

  • MetallicPriest

  • pmr
    c++ c assembly inline-assembly
    I have problems to jump to an l

  • harper
    inline-assembly iar
    The IAR compiler for ARM Cortex-M3 provides inline assembly. How can one store the address of a specific function to a location on the stack?The C code would like thisvoid tick();void bar() {int x;// modify a value on stack(&x)[4] = &tick; }W

  • Iowa15
    c x86 inline-assembly
    I have an array of hex codes that translate into assembly instructions and I want to create program in C that can execute these.unsigned char rawData[5356] = {0x4C, 0x01, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x64, 0x0C, 0x00, 0x00,0x3D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x01, 0x2E, 0x74, 0x65, 0x78,0x74, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0

  • harper

  • Adrien
    objective-c xcode inline-assembly
    This question already has an answer here:ROL / ROR on variable using inline assembly in Objective-C1 answerA few days ago, I asked the question below. Because I was in need of a quick answer, I added:T

  • Peeter Joot
    gcc clang inline-assembly
    In the following:#include struct cpuidOut {long a ;long b ;long c ;long d ; } ;void callcpuid( cpuidOut * p, long a ) {memset( p, 0xFF, sizeof(*p) ) ;p->a = a ;__asm__ ( “cpuid”: “+a”(p->a), “=b”(p->b), “=c”(p->c), “=d”(p->d) // output: // no (only) inputs: “a”, “b”, “c”, “d” // clobbered registers) ; }I get a compile error:t.C:22: error: unknown register name ‘d’ in ‘asm’ t.C:22: error: unknown regis

  • Adrien

  • Jason
    c inline-assembly extern cortex-m3 iar
    I have a bit of assembly in a hard fault handler. The assembly is basically meant to pass the current stack pointer as a parameter (in R0). It looks like so…__asm(” mov r0, sp\n”” bl SavePC\n”” bx lr”);This works fin

  • Geesu
    osx assembly inline-assembly att
    So I’m trying to include this assembly w/in my Objective-C executable:__asm volatile(“pushl %[a5]\n\t””pushl %[a4]\n\t””call %%ebx\n\t””addl $8, %%esp\n\t” : “=a” (result): “b” (FuncPtr), “a” (MyVal), “d” (MyVal2), “c” (

  • Tyilo
    c llvm inline-assembly
    When compiling this code with Apple LLVM 4.1 in Xcode I get an error:#include int main(int argc, const

  • Rowland Shaw
    c inline-assembly
    I am trying to create read() wrapper but getting this error:error: unknown register name ‘%%ebx’ in ‘asm’ in line 23 //(the bold line)Here is the code:#include

Originally posted 2013-11-09 23:30:48.