This example shows how to use the following pseudo-ops to specify the bindings of variables in C:
.common .global .local .weak
The following C definitions/declarations can be translated into the assembly code in Example 3, Using Pseudo-Ops to Specify C Variable Bindings:
int foo1 = 1; #pragma weak foo2 = foo1 static int foo3; static int foo4 = 2;Example 3 Using Pseudo-Ops to Specify C Variable Bindings
.pushsection ".data"
.global foo1 ! int foo1 = 1
.align 4
foo1:
.word 0x1
.type foo1,#object ! foo1 is of type data object,
.size foo1,4 ! with size = 4 bytes
.weak foo2 ! #pragma weak foo2 = foo1
foo2 = foo1
.local foo3 ! static int foo3
.common foo3,4,4
.align 4 ! static int foo4 = 2
foo4:
.word 0x2
.type foo4,#object
.size foo4,4
.popsection
This example shows how to use the pseudo-op .ident to generate a string in the .comment section of the object file for identification purposes.
.ident " myprog : This is an example of an ident string "
The pseudo-ops shown in this example are .align, .global, .type, and .size.
The following C subroutine can be translated into the assembly code that follows the subroutine.
int sum(a, b)
int a, b;
{
return(a + b);
}
.section ".text" .global sum .align 4 sum: retl add %o0,%o1,%o0 ! (a + b) is done in the ! delay slot of retl .type sum,#function ! sum is of type function .size sum,.-sum ! size of sum is the diff ! of current location ! counter and the initial ! definition of sum
The pseudo-ops shown in this example are .section, .ascii, and .align. The example calls the printf() function to output the string "hello world".
.section ".data1" .align 4 .L16: .ascii "hello world\n\0" .section ".text" .global main main: save %sp,-96,%sp set .L16,%o0 call printf,1 nop restore