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1.5 The Simple Example at the Assembly Level

This simple “hello world” example demonstrates several of the stab types used to describe C language source files.

     1  gcc2_compiled.:
     2  .stabs "/cygint/s1/users/jcm/play/",100,0,0,Ltext0
     3  .stabs "hello.c",100,0,0,Ltext0
     4  .text
     5  Ltext0:
     6  .stabs "int:t1=r1;-2147483648;2147483647;",128,0,0,0
     7  .stabs "char:t2=r2;0;127;",128,0,0,0
     8  .stabs "long int:t3=r1;-2147483648;2147483647;",128,0,0,0
     9  .stabs "unsigned int:t4=r1;0;-1;",128,0,0,0
     10 .stabs "long unsigned int:t5=r1;0;-1;",128,0,0,0
     11 .stabs "short int:t6=r1;-32768;32767;",128,0,0,0
     12 .stabs "long long int:t7=r1;0;-1;",128,0,0,0
     13 .stabs "short unsigned int:t8=r1;0;65535;",128,0,0,0
     14 .stabs "long long unsigned int:t9=r1;0;-1;",128,0,0,0
     15 .stabs "signed char:t10=r1;-128;127;",128,0,0,0
     16 .stabs "unsigned char:t11=r1;0;255;",128,0,0,0
     17 .stabs "float:t12=r1;4;0;",128,0,0,0
     18 .stabs "double:t13=r1;8;0;",128,0,0,0
     19 .stabs "long double:t14=r1;8;0;",128,0,0,0
     20 .stabs "void:t15=15",128,0,0,0
     21      .align 4
     22 LC0:
     23      .ascii "Hello, world!\12\0"
     24      .align 4
     25      .global _main
     26      .proc 1
     27 _main:
     28 .stabn 68,0,4,LM1
     29 LM1:
     30      !#PROLOGUE# 0
     31      save %sp,-136,%sp
     32      !#PROLOGUE# 1
     33      call ___main,0
     34      nop
     35 .stabn 68,0,5,LM2
     36 LM2:
     37 LBB2:
     38      sethi %hi(LC0),%o1
     39      or %o1,%lo(LC0),%o0
     40      call _printf,0
     41      nop
     42 .stabn 68,0,6,LM3
     43 LM3:
     44 LBE2:
     45 .stabn 68,0,6,LM4
     46 LM4:
     47 L1:
     48      ret
     49      restore
     50 .stabs "main:F1",36,0,0,_main
     51 .stabn 192,0,0,LBB2
     52 .stabn 224,0,0,LBE2