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Hi,
there seems to be a problem with the assembler code and -fPIC. My question is,
it is a gcc problem or a code problem. And how we can solve it ?
Here is the error:
pcm_dmix_i386.h: In function `mix_areas1':
pcm_dmix_i386.h:45: error: PIC register `ebx' clobbered in `asm'
pcm_dmix_i386.h: In function `mix_areas1_mmx':
pcm_dmix_i386.h:163: error: PIC register `ebx' clobbered in `asm'
pcm_dmix_i386.h: In function `mix_areas2':
pcm_dmix_i386.h:245: error: PIC register `ebx' clobbered in `asm'
pcm_dmix_i386.h: In function `mix_areas1_smp':
pcm_dmix_i386.h:45: error: PIC register `ebx' clobbered in `asm'
pcm_dmix_i386.h: In function `mix_areas1_smp_mmx':
pcm_dmix_i386.h:163: error: PIC register `ebx' clobbered in `asm'
pcm_dmix_i386.h: In function `mix_areas2_smp':
pcm_dmix_i386.h:245: error: PIC register `ebx' clobbered in `asm'
make[2]: *** [pcm_dmix.lo] Error 1
I have attached the header.
- --
Jan Killius
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/**
* \file pcm/pcm_dmix_i386.h
* \ingroup PCM_Plugins
* \brief PCM Direct Stream Mixing (dmix) Plugin Interface - I386 assembler code
* \author Jaroslav Kysela <perex@xxxxxxx>
* \date 2003
*/
/*
* PCM - Direct Stream Mixing
* Copyright (c) 2003 by Jaroslav Kysela <perex@xxxxxxx>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* for plain i386
*/
static void MIX_AREAS1(unsigned int size,
volatile signed short *dst, signed short *src,
volatile signed int *sum, size_t dst_step,
size_t src_step, size_t sum_step)
{
/*
* ESI - src
* EDI - dst
* EBX - sum
* ECX - old sample
* EAX - sample / temporary
* EDX - temporary
*/
__asm__ __volatile__ (
"\n"
/*
* initialization, load ESI, EDI, EBX registers
*/
"\tmovl %1, %%edi\n"
"\tmovl %2, %%esi\n"
"\tmovl %3, %%ebx\n"
"\tjmp 2f\n"
/*
* for (;;)
*/
"\t.p2align 4,,15\n"
"1:"
"\tadd %4, %%edi\n"
"\tadd %5, %%esi\n"
"\tadd %6, %%ebx\n"
/*
* sample = *src;
* sum_sample = *sum;
* if (cmpxchg(*dst, 0, 1) == 0)
* sample -= sum_sample;
* xadd(*sum, sample);
*/
"2:"
"\txor %%ax, %%ax\n"
"\tmovw %%ax, %%cx\n"
"\tincw %%cx\n"
"\tmovl (%%ebx), %%edx\n"
"\t" LOCK_PREFIX "cmpxchgw %%cx, (%%edi)\n"
"\tmovswl (%%esi), %%ecx\n"
"\tjnz 3f\n"
"\tsubl %%edx, %%ecx\n"
"3:"
"\t" LOCK_PREFIX "addl %%ecx, (%%ebx)\n"
/*
* do {
* sample = old_sample = *sum;
* saturate(v);
* *dst = sample;
* } while (v != *sum);
*/
"4:"
"\tmovl (%%ebx), %%ecx\n"
"\tcmpl $0x7fff,%%ecx\n"
"\tjg 5f\n"
"\tcmpl $-0x8000,%%ecx\n"
"\tjl 6f\n"
"\tmovw %%cx, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 4b\n"
/*
* while (size-- > 0)
*/
"\tdecl %0\n"
"\tjz 7f\n"
"\tjmp 1b\n"
/*
* sample > 0x7fff
*/
"\t.p2align 4,,15\n"
"5:"
"\tmovw $0x7fff, (%%edi)\n"
"\tcmpl %%ecx,(%%ebx)\n"
"\tjnz 4b\n"
"\tdecl %0\n"
"\tjnz 1b\n"
"\tjmp 7f\n"
/*
* sample < -0x8000
*/
"\t.p2align 4,,15\n"
"6:"
"\tmovw $-0x8000, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 4b\n"
"\tdecl %0\n"
"\tjnz 1b\n"
// "\tjmp 6f\n"
"7:"
: /* no output regs */
: "m" (size), "m" (dst), "m" (src), "m" (sum), "m" (dst_step), "m" (src_step), "m" (sum_step)
: "esi", "edi", "edx", "ecx", "ebx", "eax"
);
}
/*
* MMX optimized
*/
static void MIX_AREAS1_MMX(unsigned int size,
volatile signed short *dst, signed short *src,
volatile signed int *sum, size_t dst_step,
size_t src_step, size_t sum_step)
{
/*
* ESI - src
* EDI - dst
* EBX - sum
* ECX - old sample
* EAX - sample / temporary
* EDX - temporary
*/
__asm__ __volatile__ (
"\n"
/*
* initialization, load ESI, EDI, EBX registers
*/
"\tmovl %1, %%edi\n"
"\tmovl %2, %%esi\n"
"\tmovl %3, %%ebx\n"
"\tjmp 2f\n"
"\t.p2align 4,,15\n"
"1:"
"\tadd %4, %%edi\n"
"\tadd %5, %%esi\n"
"\tadd %6, %%ebx\n"
"2:"
/*
* sample = *src;
* sum_sample = *sum;
* if (cmpxchg(*dst, 0, 1) == 0)
* sample -= sum_sample;
* xadd(*sum, sample);
*/
"\txor %%ax, %%ax\n"
"\tmovw %%ax, %%cx\n"
"\tincw %%cx\n"
"\tmovl (%%ebx), %%edx\n"
"\t" LOCK_PREFIX "cmpxchgw %%cx, (%%edi)\n"
"\tmovswl (%%esi), %%ecx\n"
"\tjnz 3f\n"
"\tsubl %%edx, %%ecx\n"
"3:"
"\t" LOCK_PREFIX "addl %%ecx, (%%ebx)\n"
/*
* do {
* sample = old_sample = *sum;
* saturate(v);
* *dst = sample;
* } while (v != *sum);
*/
"4:"
"\tmovl (%%ebx), %%ecx\n"
"\tmovd %%ecx, %%mm0\n"
"\tpackssdw %%mm1, %%mm0\n"
"\tmovd %%mm0, %%eax\n"
"\tmovw %%ax, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 4b\n"
/*
* while (size-- > 0)
*/
"\tdecl %0\n"
"\tjnz 1b\n"
"\temms\n"
: /* no output regs */
: "m" (size), "m" (dst), "m" (src), "m" (sum), "m" (dst_step), "m" (src_step), "m" (sum_step)
: "esi", "edi", "edx", "ecx", "ebx", "eax"
);
}
/*
* for plain i386, 32-bit version (24-bit resolution)
*/
static void MIX_AREAS2(unsigned int size,
volatile signed int *dst, signed int *src,
volatile signed int *sum, size_t dst_step,
size_t src_step, size_t sum_step)
{
/*
* ESI - src
* EDI - dst
* EBX - sum
* ECX - old sample
* EAX - sample / temporary
* EDX - temporary
*/
__asm__ __volatile__ (
"\n"
/*
* initialization, load ESI, EDI, EBX registers
*/
"\tmovl %1, %%edi\n"
"\tmovl %2, %%esi\n"
"\tmovl %3, %%ebx\n"
"\t.p2align 4,,15\n"
"1:"
/*
* sample = *src;
* sum_sample = *sum;
* if (cmpxchg(*dst, 0, 1) == 0)
* sample -= sum_sample;
* xadd(*sum, sample);
*/
"\tmovl $0, %%eax\n"
"\tmovl $1, %%ecx\n"
"\tmovl (%%ebx), %%edx\n"
"\t" LOCK_PREFIX "cmpxchgl %%ecx, (%%edi)\n"
"\tjnz 2f\n"
"\tmovl (%%esi), %%ecx\n"
/* sample >>= 8 */
"\tsarl $8, %%ecx\n"
"\tsubl %%edx, %%ecx\n"
"\tjmp 21f\n"
"2:"
"\tmovl (%%esi), %%ecx\n"
/* sample >>= 8 */
"\tsarl $8, %%ecx\n"
"21:"
"\t" LOCK_PREFIX "addl %%ecx, (%%ebx)\n"
/*
* do {
* sample = old_sample = *sum;
* saturate(v);
* *dst = sample;
* } while (v != *sum);
*/
"3:"
"\tmovl (%%ebx), %%ecx\n"
/*
* if (sample > 0x7fff00)
*/
"\tmovl $0x7fffff, %%eax\n"
"\tcmpl %%eax, %%ecx\n"
"\tjg 4f\n"
/*
* if (sample < -0x800000)
*/
"\tmovl $-0x800000, %%eax\n"
"\tcmpl %%eax, %%ecx\n"
"\tjl 4f\n"
"\tmovl %%ecx, %%eax\n"
"4:"
/*
* sample <<= 8;
*/
"\tsall $8, %%eax\n"
"\tmovl %%eax, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 3b\n"
/*
* while (size-- > 0)
*/
"\tdecl %0\n"
"\tjz 6f\n"
"\tadd %4, %%edi\n"
"\tadd %5, %%esi\n"
"\tadd %6, %%ebx\n"
"\tjmp 1b\n"
"6:"
: /* no output regs */
: "m" (size), "m" (dst), "m" (src), "m" (sum), "m" (dst_step), "m" (src_step), "m" (sum_step)
: "esi", "edi", "edx", "ecx", "ebx", "eax"
);
}
