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[ARC] Make libgcc compatible with ARC's reduced register set config. 

ARC processors can work with a reduced register set (i.e. registers
r4-r9 and r16-r25 are not available). This option can be enabled
passing -mrf16 option to the compiler, or by using -mcpu=em_mini CPU
configuration. Using RF16 config requires all the hand-made assembly
files used in libgcc to have the corresponding RF16 object attribute
set.

This patch qualifies the relevant hand-made assembly files to
RF16 config, and also adds generic c-functions for the one which are
not.

libgcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/crti.S: Add RF16 object attribute.
	* config/arc/crtn.S: Likewise.
	* config/arc/crttls.S: Likewise.
	* config/arc/lib1funcs.S: Likewise.
	* config/arc/fp-hack.h (ARC_OPTFPE): Define.
	* config/arc/lib2funcs.c: New file.
	* config/arc/t-arc: Add lib2funcs to LIB2ADD.
This commit is contained in:
Claudiu Zissulescu 2020-01-27 14:51:03 +02:00
parent 389cd88ce7
commit 2744b8b286
8 changed files with 130 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
libgcc/ChangeLog
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@ -1,3 +1,13 @@
2020-01-27 Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/crti.S: Add RF16 object attribute.
* config/arc/crtn.S: Likewise.
* config/arc/crttls.S: Likewise.
* config/arc/lib1funcs.S: Likewise.
* config/arc/fp-hack.h (ARC_OPTFPE): Define.
* config/arc/lib2funcs.c: New file.
* config/arc/t-arc: Add lib2funcs to LIB2ADD.
2020-01-24 Maciej W. Rozycki <macro@wdc.com>
* Makefile.in (configure_deps): Add `toolexeclibdir.m4'.

5
libgcc/config/arc/crti.S
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@ -28,6 +28,11 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
# This file contains the stack frame setup for contents of the .fini and
# .init sections.
#ifdef __ARC_RF16__
/* Use object attributes to inform other tools this file is
safe for RF16 configuration. */
.arc_attribute Tag_ARC_ABI_rf16, 1
#endif
.section .init
.global _init
.word 0

5
libgcc/config/arc/crtn.S
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@ -28,6 +28,11 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
# This file just makes sure that the .fini and .init sections do in
# fact return. This file is the last thing linked into any executable.
#ifdef __ARC_RF16__
/* Use object attributes to inform other tools this file is
safe for RF16 configuration. */
.arc_attribute Tag_ARC_ABI_rf16, 1
#endif
.section .init
pop_s blink
j_s [blink]

6
libgcc/config/arc/crttls.S
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@ -33,6 +33,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
the executable file might be covered by the GNU General Public License. */
#ifdef __ARC_RF16__
/* Use object attributes to inform other tools this file is
safe for RF16 configuration. */
.arc_attribute Tag_ARC_ABI_rf16, 1
#endif
#if (__ARC_TLS_REGNO__ != -1)
/* ANSI concatenation macros. */

5
libgcc/config/arc/fp-hack.h
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@ -30,7 +30,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define ARC_FP_DEBUG 1
#define FINE_GRAINED_LIBRARIES
#define ARC_OPTFPE (defined (__ARC700__) || defined (__ARC_FPX_QUARK__))
#if defined (__ARC700__) || defined (__ARC_FPX_QUARK__)
#define ARC_OPTFPE 1
#endif
#if !ARC_OPTFPE || ARC_FP_DEBUG
#define L_pack_sf

27
libgcc/config/arc/lib1funcs.S
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@ -53,7 +53,11 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define ENDFUNC0(X) .Lfe_##X: .size X,.Lfe_##X-X
#define ENDFUNC(X) ENDFUNC0(X)
#ifdef __ARC_RF16__
/* Use object attributes to inform other tools this file is
safe for RF16 configuration. */
.arc_attribute Tag_ARC_ABI_rf16, 1
#endif
#ifdef L_mulsi3
.section .text
@ -232,6 +236,7 @@ SYM(__umulsi3_highpart):
#endif
#endif /* L_umulsidi3 */
#ifndef __ARC_RF16__
#ifdef L_muldi3
.section .text
.align 4
@ -285,6 +290,7 @@ SYM(__muldi3):
#endif /* __LITTLE_ENDIAN__ */
ENDFUNC(__muldi3)
#endif /* L_muldi3 */
#endif /* !__ARC_RF16__ */
#ifdef L_umulsi3_highpart
#include "ieee-754/arc-ieee-754.h"
@ -544,12 +550,6 @@ SYM(__udivmodsi4):
SYM(__udivsi3):
b @SYM(__udivmodsi4)
ENDFUNC(__udivsi3)
#if 0 /* interferes with linux loader */
.section .__arc_profile_forward, "a"
.long SYM(__udivsi3)
.long SYM(__udivmodsi4)
.long 65536
#endif
#endif /* L_udivsi3 */
@ -948,12 +948,6 @@ SYM(__umodsi3):
j.d [r7]
mov r0,r1
ENDFUNC(__umodsi3)
#if 0 /* interferes with linux loader */
.section .__arc_profile_forward, "a"
.long SYM(__umodsi3)
.long SYM(__udivmodsi4)
.long 65536
#endif
#endif /* L_umodsi3 */
@ -1106,6 +1100,7 @@ SYM(__clzsi2):
;;
;#endif
#ifndef __ARC_RF16__
#ifdef L_millicodethunk_st
.section .text
.align 4
@ -1315,9 +1310,7 @@ SYM(__ld_r13_to_r14_ret):
#endif /* L_millicodethunk_ret */
#define ARC_OPTFPE (defined (__ARC700__) || defined (__ARC_FPX_QUARK__))
#if ARC_OPTFPE
#if defined (__ARC700__) || defined (__ARC_FPX_QUARK__)
#ifdef L_adddf3
#ifdef __ARC_NORM__
#include "ieee-754/adddf3.S"
@ -1482,3 +1475,5 @@ SYM(__ld_r13_to_r14_ret):
#endif
#endif
#endif /* ARC_OPTFPE */
#endif /* !__ARC_RF16__ */

88
libgcc/config/arc/lib2funcs.c Normal file
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@ -0,0 +1,88 @@
/* libgcc routines for ARC
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GCC 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 General Public
License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
typedef int sint64_t __attribute__ ((mode (DI)));
typedef unsigned int uint64_t __attribute__ ((mode (DI)));
typedef unsigned int nint32_t __attribute__ ((mode (SI)));
typedef int word_t __attribute__ ((mode (__word__)));
sint64_t __muldi3 (sint64_t, sint64_t);
nint32_t __umodsi3 (nint32_t, nint32_t);
#ifdef __ARC_RF16__
/* Generic multiplication procedure. No mpy operation involved. */
sint64_t
__muldi3 (sint64_t a, sint64_t b)
{
sint64_t res = 0;
uint64_t cnt = a;
while (cnt)
{
if (cnt & 1)
res += b;
b <<= 1;
cnt >>= 1;
}
return res;
}
/* Unsigned 32bit integer division/modulus. */
static inline __attribute__ ((__always_inline__))
nint32_t
udivmodsi4 (nint32_t num, nint32_t den, word_t modwanted)
{
nint32_t bit = 1;
nint32_t res = 0;
while (den < num && bit && !(den & (1LL << 63)))
{
den <<= 1;
bit <<= 1;
}
while (bit)
{
if (num >= den)
{
num -= den;
res |= bit;
}
bit >>= 1;
den >>= 1;
}
if (modwanted)
return num;
return res;
}
nint32_t
__umodsi3 (nint32_t a, nint32_t b)
{
return udivmodsi4 (a, b, 1);
}
#endif

1
libgcc/config/arc/t-arc
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@ -43,6 +43,7 @@ LIB1ASMFUNCS = _mulsi3 _umulsidi3 _umulsi3_highpart _muldi3 \
# used in an asm wrapper.
LIB2ADD = fp-bit.c dp-bit.c
LIB2ADD += $(srcdir)/config/arc/lib2funcs.c
dp-bit.c: $(srcdir)/fp-bit.c
echo '#ifndef __big_endian__' > dp-bit.c