assembly - How to generate binary from MSP430 assembler with correct jumps? -


i'm programming msp430 in c language simulation of real microcontroller (or emulator if want). when prepare test.s file msp430:

    .text .global main     .type   main, @function  main:     mov #8,r4;     add r5,r5;    // r5 = 0     jz l1;     add r6,r6;    // r6 = 0     jz l2;     push r6;     // break purpose   l1:     mov #0x1234,r8;      push  r10;  l2:     mov #0x5678,r9;     push r11;

i got such verification (by msp430) file test.lst:

test.elf:   file format elf32-msp430  disassembly of section .text:  00000000 <main>:    0:   34 42           mov #8, r4      ;r2 as==11    2:   05 55           rla r5          ;    4:   00 24           jz  $+2          ;abs 0x6    6:   06 56           rla r6          ;    8:   00 24           jz  $+2          ;abs 0xa    a:   06 12           push    r6      ;  0000000c <l1>:    c:   38 40 34 12     mov #4660,  r8  ;#0x1234   10:   0a 12           push    r10     ;  00000012 <l2>:   12:   39 40 78 56     mov #22136, r9  ;#0x5678   16:   0b 12           push    r11     ;

the problem jumps (i.e. jz) never going happen. whatever z flag set before jz, code moving through jz. emulation of jz is:

  1. read code (16 bits) , offset (10 bits lsb)
  2. check z flag (0 or 1)
  3. if z = 0, move next section of code (pc++)
  4. else, set pc = pc + 2*offset

in binary file, generated msp430, offset value 0 (should more 0 move pc code section).

how make jumps work correctly? or maybe generation of binary file broken?

your test.elf file object file, still contains unresolved relocations.

after assembling , linking file (with c compiler, c startup code calls main), jumps correct:

$ msp430-gcc -mmcu=msp430f5529 -minrt -o test.elf test.s $ msp430-objdump -d test.elf ... 0000454e <main>:     454e:   34 42           mov #8,     r4  ;r2 as==11     4550:   05 55           rla r5          ;     4552:   03 24           jz  $+8         ;abs 0x455a     4554:   06 56           rla r6          ;     4556:   04 24           jz  $+10        ;abs 0x4560     4558:   06 12           push        r6  ;  0000455a <l1>:     455a:   38 40 34 12     mov #4660,  r8  ;#0x1234     455e:   0a 12           push        r10 ;  00004560 <l2>:     4560:   39 40 78 56     mov #22136, r9  ;#0x5678     4564:   0b 12           push        r11 ; ...

it possible generate binary this:

$ msp430-objcopy -o binary test.elf test.bin

however, resulting file not useful because not contain start address. better off creating (and using in simulator) intel hex file:

$ msp430-objcopy -o ihex test.elf test.ihex

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