Assembly error on Sun Studio 11 - Solaris 10/amd64

Question

Hi All
I am compiling my source code using cc. My cc version is
cc: Sun C 5.8 2005/10/13
I am using Sun Studio 11 and Solaris 10 on amd64 for my build.
I am getting following Assemply errors when compiling my code.
cc -xarch=amd64 -Kpic gptas.c
Assembler:
"/tmp/yabeAAALdaqGz", line 31 : Illegal mnemonic
"/tmp/yabeAAALdaqGz", line 34 : Syntax error
"/tmp/yabeAAALdaqGz", line 37 : Syntax error
"/tmp/yabeAAALdaqGz", line 50 : Illegal mnemonic
Failure in /opt/ss11/SUNWspro/prod/bin/fbe, status = 0x7f00
Fatal Error exec'ing /opt/ss11/SUNWspro/prod/bin/fbe
cc: acomp failed for gptas.c
The c code which I'm trying to compile:
/*ARGSUSED*/
int
#if defined(__STDC__) || defined(__cplusplus)
gptas(unsigned *x, short flag)
#else
gptas(x,flag)
unsigned *x;
short flag;
#endif
#ifdef __STDC__
volatile int r; /* volatile so optimizers won't get
* rid of variable - some assembly code
* depends on offsets with this on
* the stack.
#else
int r; /* var to return explicitly */
#endif
r = 0; /* always set return to 0 */
asm(" movl $1,%eax"); /* this 1 inworking reg will set x /
asm(" pushl %ebx"); /* save the register; eax already saved */
asm(" movl 8(%ebp),%ebx"); /* move the address of x */
asm(" xchg %eax,(%ebx)"); /* atomic swap a one with x /
asm(" cmp $0,%eax"); /* test what was in x /
asm(" jnz .A9999"); /* jump if x was already set /
r = 1; /* indicate set occurred */
asm(" .A9999:");
asm(" popl %ebx"); /* restore the register */
return(r);
Can someone let me know if this is a Compiler issue or it has something to do with my code .
I'll Appreciate any help on this.
Thanks in Advance
Somak

Answer 1

If you specify -S compiler option, assembly file will be produced and it enables you to look at the code assembler is complaining about. For example:
/ASM
pushl %ebx <== line 31
/ASMEND
I'm not too familiar with AMD64 ABI, but it is possible that you can't use 32-bit registers in 64 bit mode with some operations like memory (including stack) access.
I was able to compile code with the following changes:
asm(" movl $1,%eax"); /* this 1 inworking reg will set x /
asm(" pushl %rbx"); /* save the register; eax already saved */
asm(" movl 8(%rbp),%ebx"); /* move the address of x */
asm(" xchg %eax,(%rbx)"); /* atomic swap a one with x /
asm(" cmp $0,%eax"); /* test what was in x /
asm(" jnz .A9999"); /* jump if x was already set /
r = 1; /* indicate set occurred */
asm(" .A9999:");
asm(" popl %rbx"); /* restore the register */