On Tue, 10 Apr 2007, Paul Durrant wrote:
On 4/10/07, Adam Zhang <[EMAIL PROTECTED]> wrote:
i just write an independent write function in assembly language to write
a string to stderr.
But the code doesn't work on Solaris. Below is the code:
void write_stderr ( char * buf, int n )
{
int block[2];
block[0] = (int) buf;
block[1] = n;
__asm__ volatile (
"pushl %%ebx\n"
"movl %0, %%ebx\n"
"pushl %%ebx\n"
"movl 0(%%ebx), %%ecx\n"
"movl 4(%%ebx), %%edx\n"
"movl $4, %%eax\n"
"movl $2, %%ebx\n"
"int $0x91\n"
I imagine this is your problem. Is your kernel 32 or 64-bit? IIRC
system calls are handled differently in each case, and I don't think
either use int 0x91 anyway. I also have to ask... why can't you use
syscall()?
Not only that - but why do you even require to do this ?
int 0x91 is ok on recent OpenSolaris builds, for 32bit x86 apps. But then,
what's the advantage of non-portable hacks like the above versus:
void write_stderr ( char * buf, int n )
{
(void)write(fileno(stderr), buf, n);
}
Why can you not have the library call ?
FrankH.
"popl %%ebx\n"
"movl %%eax, 0(%%ebx)\n"
"popl %%ebx\n"
: /*wr*/
: /*rd*/ "g" (block)
: /*trash*/ "eax", "edi", "ecx", "edx", "memory", "cc"
);
}
Does anyone know where i am wrong?
Thank you!
Regards,
adam
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--
Paul Durrant
http://www.linkedin.com/in/pdurrant
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