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m68k: add private libgcc ashrdi3

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Add ashrdi3.c to private libgcc.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
This commit is contained in:
Angelo Dureghello
2023-03-14 10:06:58 +01:00
parent 36a5ebf841
commit ec4322e70b
2 changed files with 49 additions and 1 deletions
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2
arch/m68k/lib/Makefile
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@@ -5,7 +5,7 @@
## Build a couple of necessary functions into a private libgcc
## if the user asked for it
lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o
lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o ashrdi3.o
obj-y += bdinfo.o
obj-$(CONFIG_CMD_BOOTM) += bootm.o

48
arch/m68k/lib/ashrdi3.c Normal file
View File

@@ -0,0 +1,48 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* ashrdi3.c extracted from gcc-2.7.2/libgcc2.c which is:
* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
*/
#define BITS_PER_UNIT 8
typedef int SItype __attribute__((mode(SI)));
typedef unsigned int USItype __attribute__((mode(SI)));
typedef int DItype __attribute__((mode(DI)));
typedef int word_type __attribute__((mode(__word__)));
struct DIstruct {
SItype high, low;
};
typedef union {
struct DIstruct s;
DItype ll;
} di_union;
DItype __ashrdi3(DItype u, word_type b)
{
di_union w;
word_type bm;
di_union uu;
if (b == 0)
return u;
uu.ll = u;
bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
if (bm <= 0) {
/* w.s.high = 1..1 or 0..0 */
w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
w.s.low = uu.s.high >> -bm;
} else {
USItype carries = (USItype)uu.s.high << bm;
w.s.high = uu.s.high >> b;
w.s.low = ((USItype)uu.s.low >> b) | carries;
}
return w.ll;
}