Remove libgcc dependency.

libgcc for boot environment isn't always present and compatible.
libgcc is often absent if endianness or bit-size at boot is different
from running OS.
libgcc may use optimised opcodes that aren't available on boot time.
So instead of relying on libgcc shipped with the compiler, supply
the functions in GRUB directly.
Tests are present to ensure that those replacement functions behave the
way compiler expects them to.
This commit is contained in:
Vladimir Serbinenko 2015-03-03 20:23:42 +01:00
parent 77697d14e5
commit 064360e667
21 changed files with 1441 additions and 479 deletions

View file

@ -0,0 +1,404 @@
/* compiler-rt.c - compiler helpers. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010-2014 Free Software Foundation, Inc.
*
* GRUB 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 of the License, or
* (at your option) any later version.
*
* GRUB 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.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/misc.h>
#include <grub/compiler-rt.h>
#ifndef GRUB_EMBED_DECOMPRESSOR
void * GRUB_BUILTIN_ATTR
memcpy (void *dest, const void *src, grub_size_t n)
{
return grub_memmove (dest, src, n);
}
void * GRUB_BUILTIN_ATTR
memmove (void *dest, const void *src, grub_size_t n)
{
return grub_memmove (dest, src, n);
}
int GRUB_BUILTIN_ATTR
memcmp (const void *s1, const void *s2, grub_size_t n)
{
return grub_memcmp (s1, s2, n);
}
void * GRUB_BUILTIN_ATTR
memset (void *s, int c, grub_size_t n)
{
return grub_memset (s, c, n);
}
#ifdef __APPLE__
void GRUB_BUILTIN_ATTR
__bzero (void *s, grub_size_t n)
{
grub_memset (s, 0, n);
}
#endif
#if GRUB_DIVISION_IN_SOFTWARE
grub_uint32_t
__udivsi3 (grub_uint32_t a, grub_uint32_t b)
{
return grub_divmod64 (a, b, 0);
}
grub_int32_t
__divsi3 (grub_int32_t a, grub_int32_t b)
{
return grub_divmod64s (a, b, 0);
}
grub_uint32_t
__umodsi3 (grub_uint32_t a, grub_uint32_t b)
{
grub_uint64_t ret;
grub_divmod64 (a, b, &ret);
return ret;
}
grub_int32_t
__modsi3 (grub_int32_t a, grub_int32_t b)
{
grub_int64_t ret;
grub_divmod64s (a, b, &ret);
return ret;
}
grub_uint64_t
__udivdi3 (grub_uint64_t a, grub_uint64_t b)
{
return grub_divmod64 (a, b, 0);
}
grub_uint64_t
__umoddi3 (grub_uint64_t a, grub_uint64_t b)
{
grub_uint64_t ret;
grub_divmod64 (a, b, &ret);
return ret;
}
grub_int64_t
__divdi3 (grub_int64_t a, grub_int64_t b)
{
return grub_divmod64s (a, b, 0);
}
grub_int64_t
__moddi3 (grub_int64_t a, grub_int64_t b)
{
grub_int64_t ret;
grub_divmod64s (a, b, &ret);
return ret;
}
#endif
#endif
#ifdef NEED_CTZDI2
unsigned
__ctzdi2 (grub_uint64_t x)
{
unsigned ret = 0;
if (!x)
return 64;
if (!(x & 0xffffffff))
{
x >>= 32;
ret |= 32;
}
if (!(x & 0xffff))
{
x >>= 16;
ret |= 16;
}
if (!(x & 0xff))
{
x >>= 8;
ret |= 8;
}
if (!(x & 0xf))
{
x >>= 4;
ret |= 4;
}
if (!(x & 0x3))
{
x >>= 2;
ret |= 2;
}
if (!(x & 0x1))
{
x >>= 1;
ret |= 1;
}
return ret;
}
#endif
#ifdef NEED_CTZSI2
unsigned
__ctzsi2 (grub_uint32_t x)
{
unsigned ret = 0;
if (!x)
return 32;
if (!(x & 0xffff))
{
x >>= 16;
ret |= 16;
}
if (!(x & 0xff))
{
x >>= 8;
ret |= 8;
}
if (!(x & 0xf))
{
x >>= 4;
ret |= 4;
}
if (!(x & 0x3))
{
x >>= 2;
ret |= 2;
}
if (!(x & 0x1))
{
x >>= 1;
ret |= 1;
}
return ret;
}
#endif
#if defined (__clang__) && !defined(GRUB_EMBED_DECOMPRESSOR)
/* clang emits references to abort(). */
void __attribute__ ((noreturn))
abort (void)
{
grub_fatal ("compiler abort");
}
#endif
#if (defined (__MINGW32__) || defined (__CYGWIN__))
void __register_frame_info (void)
{
}
void __deregister_frame_info (void)
{
}
void ___chkstk_ms (void)
{
}
void __chkstk_ms (void)
{
}
#endif
union component64
{
grub_uint64_t full;
struct
{
#ifdef GRUB_CPU_WORDS_BIGENDIAN
grub_uint32_t high;
grub_uint32_t low;
#else
grub_uint32_t low;
grub_uint32_t high;
#endif
};
};
#if defined (__powerpc__) || defined (__arm__) || defined(__mips__)
/* Based on libgcc2.c from gcc suite. */
grub_uint64_t
__lshrdi3 (grub_uint64_t u, int b)
{
if (b == 0)
return u;
const union component64 uu = {.full = u};
const int bm = 32 - b;
union component64 w;
if (bm <= 0)
{
w.high = 0;
w.low = (grub_uint32_t) uu.high >> -bm;
}
else
{
const grub_uint32_t carries = (grub_uint32_t) uu.high << bm;
w.high = (grub_uint32_t) uu.high >> b;
w.low = ((grub_uint32_t) uu.low >> b) | carries;
}
return w.full;
}
/* Based on libgcc2.c from gcc suite. */
grub_uint64_t
__ashrdi3 (grub_uint64_t u, int b)
{
if (b == 0)
return u;
const union component64 uu = {.full = u};
const int bm = 32 - b;
union component64 w;
if (bm <= 0)
{
/* w.high = 1..1 or 0..0 */
w.high = ((grub_int32_t) uu.high) >> (32 - 1);
w.low = ((grub_int32_t) uu.high) >> -bm;
}
else
{
const grub_uint32_t carries = ((grub_uint32_t) uu.high) << bm;
w.high = ((grub_int32_t) uu.high) >> b;
w.low = ((grub_uint32_t) uu.low >> b) | carries;
}
return w.full;
}
/* Based on libgcc2.c from gcc suite. */
grub_uint64_t
__ashldi3 (grub_uint64_t u, int b)
{
if (b == 0)
return u;
const union component64 uu = {.full = u};
const int bm = 32 - b;
union component64 w;
if (bm <= 0)
{
w.low = 0;
w.high = (grub_uint32_t) uu.low << -bm;
}
else
{
const grub_uint32_t carries = (grub_uint32_t) uu.low >> bm;
w.low = (grub_uint32_t) uu.low << b;
w.high = ((grub_uint32_t) uu.high << b) | carries;
}
return w.full;
}
/* Based on libgcc2.c from gcc suite. */
int
__ucmpdi2 (grub_uint64_t a, grub_uint64_t b)
{
union component64 ac, bc;
ac.full = a;
bc.full = b;
if (ac.high < bc.high)
return 0;
else if (ac.high > bc.high)
return 2;
if (ac.low < bc.low)
return 0;
else if (ac.low > bc.low)
return 2;
return 1;
}
#endif
#if defined (__powerpc__) || defined(__mips__) || defined(__sparc__) || defined(__arm__)
/* Based on libgcc2.c from gcc suite. */
grub_uint32_t
__bswapsi2 (grub_uint32_t u)
{
return ((((u) & 0xff000000) >> 24)
| (((u) & 0x00ff0000) >> 8)
| (((u) & 0x0000ff00) << 8)
| (((u) & 0x000000ff) << 24));
}
/* Based on libgcc2.c from gcc suite. */
grub_uint64_t
__bswapdi2 (grub_uint64_t u)
{
return ((((u) & 0xff00000000000000ull) >> 56)
| (((u) & 0x00ff000000000000ull) >> 40)
| (((u) & 0x0000ff0000000000ull) >> 24)
| (((u) & 0x000000ff00000000ull) >> 8)
| (((u) & 0x00000000ff000000ull) << 8)
| (((u) & 0x0000000000ff0000ull) << 24)
| (((u) & 0x000000000000ff00ull) << 40)
| (((u) & 0x00000000000000ffull) << 56));
}
#endif
#ifdef __arm__
grub_uint32_t
__aeabi_uidiv (grub_uint32_t a, grub_uint32_t b)
__attribute__ ((alias ("__udivsi3")));
grub_int32_t
__aeabi_idiv (grub_int32_t a, grub_int32_t b)
__attribute__ ((alias ("__divsi3")));
void *__aeabi_memcpy (void *dest, const void *src, grub_size_t n)
__attribute__ ((alias ("grub_memcpy")));
void *__aeabi_memset (void *s, int c, grub_size_t n)
__attribute__ ((alias ("memset")));
int
__aeabi_ulcmp (grub_uint64_t a, grub_uint64_t b)
{
return __ucmpdi2 (a, b) - 1;
}
grub_uint64_t
__aeabi_lasr (grub_uint64_t u, int b)
__attribute__ ((alias ("__ashrdi3")));
grub_uint64_t
__aeabi_llsr (grub_uint64_t u, int b)
__attribute__ ((alias ("__lshrdi3")));
grub_uint64_t
__aeabi_llsl (grub_uint64_t u, int b)
__attribute__ ((alias ("__ashldi3")));
#endif

View file

@ -95,25 +95,6 @@ grub_memmove (void *dest, const void *src, grub_size_t n)
return dest;
}
#ifndef __APPLE__
void *memmove (void *dest, const void *src, grub_size_t n)
__attribute__ ((alias ("grub_memmove")));
/* GCC emits references to memcpy() for struct copies etc. */
void *memcpy (void *dest, const void *src, grub_size_t n)
__attribute__ ((alias ("grub_memmove")));
#else
void * GRUB_BUILTIN_ATTR
memcpy (void *dest, const void *src, grub_size_t n)
{
return grub_memmove (dest, src, n);
}
void * GRUB_BUILTIN_ATTR
memmove (void *dest, const void *src, grub_size_t n)
{
return grub_memmove (dest, src, n);
}
#endif
char *
grub_strcpy (char *dest, const char *src)
{
@ -253,16 +234,6 @@ grub_memcmp (const void *s1, const void *s2, grub_size_t n)
return 0;
}
#ifndef __APPLE__
int memcmp (const void *s1, const void *s2, grub_size_t n)
__attribute__ ((alias ("grub_memcmp")));
#else
int GRUB_BUILTIN_ATTR
memcmp (const void *s1, const void *s2, grub_size_t n)
{
return grub_memcmp (s1, s2, n);
}
#endif
int
grub_strcmp (const char *s1, const char *s2)
@ -532,26 +503,6 @@ grub_memset (void *s, int c, grub_size_t len)
return s;
}
#ifndef __APPLE__
void *memset (void *s, int c, grub_size_t n)
__attribute__ ((alias ("grub_memset")));
#else
void * GRUB_BUILTIN_ATTR
memset (void *s, int c, grub_size_t n)
{
return grub_memset (s, c, n);
}
#endif
#if !defined(GRUB_UTIL) && defined(__APPLE__)
void GRUB_BUILTIN_ATTR
__bzero (void *s, grub_size_t n)
{
grub_memset (s, 0, n);
}
#endif
grub_size_t
grub_strlen (const char *s)
@ -631,163 +582,6 @@ grub_divmod64 (grub_uint64_t n, grub_uint64_t d, grub_uint64_t *r)
return q;
}
#if !defined (GRUB_UTIL) && !defined (GRUB_MACHINE_EMU)
#if GRUB_DIVISION_IN_SOFTWARE
grub_uint32_t
__udivsi3 (grub_uint32_t a, grub_uint32_t b)
{
return grub_divmod64 (a, b, 0);
}
grub_int32_t
__divsi3 (grub_int32_t a, grub_int32_t b)
{
return grub_divmod64s (a, b, 0);
}
grub_uint32_t
__umodsi3 (grub_uint32_t a, grub_uint32_t b)
{
grub_uint64_t ret;
grub_divmod64 (a, b, &ret);
return ret;
}
grub_int32_t
__modsi3 (grub_int32_t a, grub_int32_t b)
{
grub_int64_t ret;
grub_divmod64s (a, b, &ret);
return ret;
}
grub_uint64_t
__udivdi3 (grub_uint64_t a, grub_uint64_t b)
{
return grub_divmod64 (a, b, 0);
}
grub_uint64_t
__umoddi3 (grub_uint64_t a, grub_uint64_t b)
{
grub_uint64_t ret;
grub_divmod64 (a, b, &ret);
return ret;
}
grub_int64_t
__divdi3 (grub_int64_t a, grub_int64_t b)
{
return grub_divmod64s (a, b, 0);
}
grub_int64_t
__moddi3 (grub_int64_t a, grub_int64_t b)
{
grub_int64_t ret;
grub_divmod64s (a, b, &ret);
return ret;
}
#endif
#ifdef NEED_CTZDI2
unsigned
__ctzdi2 (grub_uint64_t x)
{
unsigned ret = 0;
if (!x)
return 64;
if (!(x & 0xffffffff))
{
x >>= 32;
ret |= 32;
}
if (!(x & 0xffff))
{
x >>= 16;
ret |= 16;
}
if (!(x & 0xff))
{
x >>= 8;
ret |= 8;
}
if (!(x & 0xf))
{
x >>= 4;
ret |= 4;
}
if (!(x & 0x3))
{
x >>= 2;
ret |= 2;
}
if (!(x & 0x1))
{
x >>= 1;
ret |= 1;
}
return ret;
}
#endif
#ifdef NEED_CTZSI2
unsigned
__ctzsi2 (grub_uint32_t x)
{
unsigned ret = 0;
if (!x)
return 32;
if (!(x & 0xffff))
{
x >>= 16;
ret |= 16;
}
if (!(x & 0xff))
{
x >>= 8;
ret |= 8;
}
if (!(x & 0xf))
{
x >>= 4;
ret |= 4;
}
if (!(x & 0x3))
{
x >>= 2;
ret |= 2;
}
if (!(x & 0x1))
{
x >>= 1;
ret |= 1;
}
return ret;
}
#endif
#ifdef __arm__
grub_uint32_t
__aeabi_uidiv (grub_uint32_t a, grub_uint32_t b)
__attribute__ ((alias ("__udivsi3")));
grub_int32_t
__aeabi_idiv (grub_int32_t a, grub_int32_t b)
__attribute__ ((alias ("__divsi3")));
void *__aeabi_memcpy (void *dest, const void *src, grub_size_t n)
__attribute__ ((alias ("grub_memcpy")));
void *__aeabi_memset (void *s, int c, grub_size_t n)
__attribute__ ((alias ("grub_memset")));
#endif
#endif /* GRUB_UTIL */
/* Convert a long long value to a string. This function avoids 64-bit
modular arithmetic or divisions. */
static inline char *
@ -1296,15 +1090,6 @@ grub_abort (void)
grub_exit ();
}
#if defined (__clang__) && !defined (GRUB_UTIL)
/* clang emits references to abort(). */
void __attribute__ ((noreturn))
abort (void)
{
grub_abort ();
}
#endif
void
grub_fatal (const char *fmt, ...)
{
@ -1317,23 +1102,6 @@ grub_fatal (const char *fmt, ...)
grub_abort ();
}
#if (defined (__MINGW32__) || defined (__CYGWIN__)) && !defined(GRUB_UTIL)
void __register_frame_info (void)
{
}
void __deregister_frame_info (void)
{
}
void ___chkstk_ms (void)
{
}
void __chkstk_ms (void)
{
}
#endif
#if BOOT_TIME_STATS
#include <grub/time.h>

View file

@ -0,0 +1,130 @@
/*
* Special support for eabi and SVR4
*
* Copyright (C) 1995-2014 Free Software Foundation, Inc.
* Written By Michael Meissner
* 64-bit support written by David Edelsohn
*
* This file 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.
*
* This file 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/>.
*/
/* Do any initializations needed for the eabi environment */
#include <grub/symbol.h>
#include <grub/dl.h>
.section ".text"
#define CFI_RESTORE(reg) .cfi_restore reg
#define CFI_OFFSET(reg, off) .cfi_offset reg, off
#define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
#define CFI_STARTPROC .cfi_startproc
#define CFI_ENDPROC .cfi_endproc
/* Routines for restoring integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer restore area. */
CFI_STARTPROC
CFI_DEF_CFA_REGISTER (11)
CFI_OFFSET (65, 4)
CFI_OFFSET (14, -72)
CFI_OFFSET (15, -68)
CFI_OFFSET (16, -64)
CFI_OFFSET (17, -60)
CFI_OFFSET (18, -56)
CFI_OFFSET (19, -52)
CFI_OFFSET (20, -48)
CFI_OFFSET (21, -44)
CFI_OFFSET (22, -40)
CFI_OFFSET (23, -36)
CFI_OFFSET (24, -32)
CFI_OFFSET (25, -28)
CFI_OFFSET (26, -24)
CFI_OFFSET (27, -20)
CFI_OFFSET (28, -16)
CFI_OFFSET (29, -12)
CFI_OFFSET (30, -8)
CFI_OFFSET (31, -4)
FUNCTION(_restgpr_14_x) lwz 14,-72(11) /* restore gp registers */
CFI_RESTORE (14)
FUNCTION(_restgpr_15_x) lwz 15,-68(11)
CFI_RESTORE (15)
FUNCTION(_restgpr_16_x) lwz 16,-64(11)
CFI_RESTORE (16)
FUNCTION(_restgpr_17_x) lwz 17,-60(11)
CFI_RESTORE (17)
FUNCTION(_restgpr_18_x) lwz 18,-56(11)
CFI_RESTORE (18)
FUNCTION(_restgpr_19_x) lwz 19,-52(11)
CFI_RESTORE (19)
FUNCTION(_restgpr_20_x) lwz 20,-48(11)
CFI_RESTORE (20)
FUNCTION(_restgpr_21_x) lwz 21,-44(11)
CFI_RESTORE (21)
FUNCTION(_restgpr_22_x) lwz 22,-40(11)
CFI_RESTORE (22)
FUNCTION(_restgpr_23_x) lwz 23,-36(11)
CFI_RESTORE (23)
FUNCTION(_restgpr_24_x) lwz 24,-32(11)
CFI_RESTORE (24)
FUNCTION(_restgpr_25_x) lwz 25,-28(11)
CFI_RESTORE (25)
FUNCTION(_restgpr_26_x) lwz 26,-24(11)
CFI_RESTORE (26)
FUNCTION(_restgpr_27_x) lwz 27,-20(11)
CFI_RESTORE (27)
FUNCTION(_restgpr_28_x) lwz 28,-16(11)
CFI_RESTORE (28)
FUNCTION(_restgpr_29_x) lwz 29,-12(11)
CFI_RESTORE (29)
FUNCTION(_restgpr_30_x) lwz 30,-8(11)
CFI_RESTORE (30)
FUNCTION(_restgpr_31_x) lwz 0,4(11)
lwz 31,-4(11)
CFI_RESTORE (31)
mtlr 0
CFI_RESTORE (65)
mr 1,11
CFI_DEF_CFA_REGISTER (1)
blr
CFI_ENDPROC
CFI_STARTPROC
FUNCTION(_savegpr_14) stw 14,-72(11) /* save gp registers */
FUNCTION(_savegpr_15) stw 15,-68(11)
FUNCTION(_savegpr_16) stw 16,-64(11)
FUNCTION(_savegpr_17) stw 17,-60(11)
FUNCTION(_savegpr_18) stw 18,-56(11)
FUNCTION(_savegpr_19) stw 19,-52(11)
FUNCTION(_savegpr_20) stw 20,-48(11)
FUNCTION(_savegpr_21) stw 21,-44(11)
FUNCTION(_savegpr_22) stw 22,-40(11)
FUNCTION(_savegpr_23) stw 23,-36(11)
FUNCTION(_savegpr_24) stw 24,-32(11)
FUNCTION(_savegpr_25) stw 25,-28(11)
FUNCTION(_savegpr_26) stw 26,-24(11)
FUNCTION(_savegpr_27) stw 27,-20(11)
FUNCTION(_savegpr_28) stw 28,-16(11)
FUNCTION(_savegpr_29) stw 29,-12(11)
FUNCTION(_savegpr_30) stw 30,-8(11)
FUNCTION(_savegpr_31) stw 31,-4(11)
blr
CFI_ENDPROC