[U-Boot] [PATCH 12/12] arc: build libgcc in U-Boot
Alexey Brodkin
Alexey.Brodkin at synopsys.com
Tue Feb 3 11:58:20 CET 2015
This way we may have very limited set of functions implemented so we
save some space.
Also it allows us to build U-Boot for any ARC core with the same one
toolchain because we don't rely on pre-built libgcc.
For example:
* we may use little-endian toolchain but build U-Boot for ether
endianess
* we may use non-multilibbed uClibc toolchain but build U-Boot for
whatever ARC CPU flavour that current GCC supports
Private libgcc built from generic C implementation contributes only 144
bytes to .text section so we don't see significant degradation of size:
--->8---
$ arc-linux-size u-boot.libgcc-prebuilt
text data bss dec hex filename
222217 24912 214820 461949 70c7d u-boot.libgcc-prebuilt
$ arc-linux-size u-boot.libgcc-private
text data bss dec hex filename
222361 24912 214820 462093 70d0d u-boot.libgcc-private
--->8---
Also I don't notice visible performance degradation compared to
pre-built libgcc (where at least "*div*" functions are had-written in
assembly) on typical operations of downloading 10Mb uImage over TFTP and
bootm.
Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
---
arch/Kconfig | 1 +
arch/arc/Kconfig | 3 +
arch/arc/config.mk | 3 +
arch/arc/lib/Makefile | 2 +
arch/arc/lib/_millicodethunk.S | 226 +++++++++++++++++++++++++++++++++++++++++
arch/arc/lib/libgcc2.c | 161 +++++++++++++++++++++++++++++
arch/arc/lib/libgcc2.h | 132 ++++++++++++++++++++++++
7 files changed, 528 insertions(+)
create mode 100644 arch/arc/lib/_millicodethunk.S
create mode 100644 arch/arc/lib/libgcc2.c
create mode 100644 arch/arc/lib/libgcc2.h
diff --git a/arch/Kconfig b/arch/Kconfig
index f63cc5a..132123b 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -4,6 +4,7 @@ choice
config ARC
bool "ARC architecture"
+ select HAVE_PRIVATE_LIBGCC
config ARM
bool "ARM architecture"
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 04fc7b6..a8dc4e2 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -4,6 +4,9 @@ menu "ARC architecture"
config SYS_ARCH
default "arc"
+config USE_PRIVATE_LIBGCC
+ default y
+
config SYS_CPU
default "arcv1"
diff --git a/arch/arc/config.mk b/arch/arc/config.mk
index 3e75e60..f1e81b6 100644
--- a/arch/arc/config.mk
+++ b/arch/arc/config.mk
@@ -12,11 +12,14 @@ endif
ifdef CONFIG_SYS_LITTLE_ENDIAN
ARC_CROSS_COMPILE := arc-buildroot-linux-uclibc-
+PLATFORM_LDFLAGS += -EL
+PLATFORM_CPPFLAGS += -mlittle-endian
endif
ifdef CONFIG_SYS_BIG_ENDIAN
ARC_CROSS_COMPILE := arceb-buildroot-linux-uclibc-
PLATFORM_LDFLAGS += -EB
+PLATFORM_CPPFLAGS += -mbig-endian
endif
ifeq ($(CROSS_COMPILE),)
diff --git a/arch/arc/lib/Makefile b/arch/arc/lib/Makefile
index bae4419..b8028c9 100644
--- a/arch/arc/lib/Makefile
+++ b/arch/arc/lib/Makefile
@@ -20,3 +20,5 @@ obj-y += reset.o
obj-y += timer.o
obj-$(CONFIG_CMD_BOOTM) += bootm.o
+
+lib-$(CONFIG_USE_PRIVATE_LIBGCC) += _millicodethunk.o libgcc2.o
diff --git a/arch/arc/lib/_millicodethunk.S b/arch/arc/lib/_millicodethunk.S
new file mode 100644
index 0000000..b332416
--- /dev/null
+++ b/arch/arc/lib/_millicodethunk.S
@@ -0,0 +1,226 @@
+/*
+ * Copyright (C) 1995, 1997, 2007-2013 Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+ /* ANSI concatenation macros. */
+
+ #define CONCAT1(a, b) CONCAT2(a, b)
+ #define CONCAT2(a, b) a ## b
+
+ /* Use the right prefix for global labels. */
+
+ #define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
+
+#ifndef WORKING_ASSEMBLER
+#define abs_l abs
+#define asl_l asl
+#define mov_l mov
+#endif
+
+#define FUNC(X) .type SYM(X), at function
+#define HIDDEN_FUNC(X) FUNC(X)` .hidden X
+#define ENDFUNC0(X) .Lfe_##X: .size X,.Lfe_##X-X
+#define ENDFUNC(X) ENDFUNC0(X)
+
+ .section .text
+ .align 4
+ .global SYM(__st_r13_to_r15)
+ .global SYM(__st_r13_to_r16)
+ .global SYM(__st_r13_to_r17)
+ .global SYM(__st_r13_to_r18)
+ .global SYM(__st_r13_to_r19)
+ .global SYM(__st_r13_to_r20)
+ .global SYM(__st_r13_to_r21)
+ .global SYM(__st_r13_to_r22)
+ .global SYM(__st_r13_to_r23)
+ .global SYM(__st_r13_to_r24)
+ .global SYM(__st_r13_to_r25)
+ HIDDEN_FUNC(__st_r13_to_r15)
+ HIDDEN_FUNC(__st_r13_to_r16)
+ HIDDEN_FUNC(__st_r13_to_r17)
+ HIDDEN_FUNC(__st_r13_to_r18)
+ HIDDEN_FUNC(__st_r13_to_r19)
+ HIDDEN_FUNC(__st_r13_to_r20)
+ HIDDEN_FUNC(__st_r13_to_r21)
+ HIDDEN_FUNC(__st_r13_to_r22)
+ HIDDEN_FUNC(__st_r13_to_r23)
+ HIDDEN_FUNC(__st_r13_to_r24)
+ HIDDEN_FUNC(__st_r13_to_r25)
+ .align 4
+SYM(__st_r13_to_r25):
+ st r25, [sp,48]
+SYM(__st_r13_to_r24):
+ st r24, [sp,44]
+SYM(__st_r13_to_r23):
+ st r23, [sp,40]
+SYM(__st_r13_to_r22):
+ st r22, [sp,36]
+SYM(__st_r13_to_r21):
+ st r21, [sp,32]
+SYM(__st_r13_to_r20):
+ st r20, [sp,28]
+SYM(__st_r13_to_r19):
+ st r19, [sp,24]
+SYM(__st_r13_to_r18):
+ st r18, [sp,20]
+SYM(__st_r13_to_r17):
+ st r17, [sp,16]
+SYM(__st_r13_to_r16):
+ st r16, [sp,12]
+SYM(__st_r13_to_r15):
+#ifdef __ARC700__
+ st r15, [sp,8] ; minimum function size to avoid stall: 6 bytes.
+#else
+ st_s r15, [sp,8]
+#endif
+ st_s r14, [sp,4]
+ j_s.d [%blink]
+ st_s r13, [sp,0]
+ ENDFUNC(__st_r13_to_r15)
+ ENDFUNC(__st_r13_to_r16)
+ ENDFUNC(__st_r13_to_r17)
+ ENDFUNC(__st_r13_to_r18)
+ ENDFUNC(__st_r13_to_r19)
+ ENDFUNC(__st_r13_to_r20)
+ ENDFUNC(__st_r13_to_r21)
+ ENDFUNC(__st_r13_to_r22)
+ ENDFUNC(__st_r13_to_r23)
+ ENDFUNC(__st_r13_to_r24)
+ ENDFUNC(__st_r13_to_r25)
+
+ .section .text
+ .align 4
+; ==================================
+; the loads
+
+ .global SYM(__ld_r13_to_r15)
+ .global SYM(__ld_r13_to_r16)
+ .global SYM(__ld_r13_to_r17)
+ .global SYM(__ld_r13_to_r18)
+ .global SYM(__ld_r13_to_r19)
+ .global SYM(__ld_r13_to_r20)
+ .global SYM(__ld_r13_to_r21)
+ .global SYM(__ld_r13_to_r22)
+ .global SYM(__ld_r13_to_r23)
+ .global SYM(__ld_r13_to_r24)
+ .global SYM(__ld_r13_to_r25)
+ HIDDEN_FUNC(__ld_r13_to_r15)
+ HIDDEN_FUNC(__ld_r13_to_r16)
+ HIDDEN_FUNC(__ld_r13_to_r17)
+ HIDDEN_FUNC(__ld_r13_to_r18)
+ HIDDEN_FUNC(__ld_r13_to_r19)
+ HIDDEN_FUNC(__ld_r13_to_r20)
+ HIDDEN_FUNC(__ld_r13_to_r21)
+ HIDDEN_FUNC(__ld_r13_to_r22)
+ HIDDEN_FUNC(__ld_r13_to_r23)
+ HIDDEN_FUNC(__ld_r13_to_r24)
+ HIDDEN_FUNC(__ld_r13_to_r25)
+SYM(__ld_r13_to_r25):
+ ld r25, [sp,48]
+SYM(__ld_r13_to_r24):
+ ld r24, [sp,44]
+SYM(__ld_r13_to_r23):
+ ld r23, [sp,40]
+SYM(__ld_r13_to_r22):
+ ld r22, [sp,36]
+SYM(__ld_r13_to_r21):
+ ld r21, [sp,32]
+SYM(__ld_r13_to_r20):
+ ld r20, [sp,28]
+SYM(__ld_r13_to_r19):
+ ld r19, [sp,24]
+SYM(__ld_r13_to_r18):
+ ld r18, [sp,20]
+SYM(__ld_r13_to_r17):
+ ld r17, [sp,16]
+SYM(__ld_r13_to_r16):
+ ld r16, [sp,12]
+SYM(__ld_r13_to_r15):
+#ifdef __ARC700__
+ ld r15, [sp,8] ; minimum function size to avoid stall: 6 bytes.
+#else
+ ld_s r15, [sp,8]
+#endif
+ ld_s r14, [sp,4]
+ j_s.d [%blink]
+ ld_s r13, [sp,0]
+ ENDFUNC(__ld_r13_to_r15)
+ ENDFUNC(__ld_r13_to_r16)
+ ENDFUNC(__ld_r13_to_r17)
+ ENDFUNC(__ld_r13_to_r18)
+ ENDFUNC(__ld_r13_to_r19)
+ ENDFUNC(__ld_r13_to_r20)
+ ENDFUNC(__ld_r13_to_r21)
+ ENDFUNC(__ld_r13_to_r22)
+ ENDFUNC(__ld_r13_to_r23)
+ ENDFUNC(__ld_r13_to_r24)
+ ENDFUNC(__ld_r13_to_r25)
+
+ .global SYM(__ld_r13_to_r14_ret)
+ .global SYM(__ld_r13_to_r15_ret)
+ .global SYM(__ld_r13_to_r16_ret)
+ .global SYM(__ld_r13_to_r17_ret)
+ .global SYM(__ld_r13_to_r18_ret)
+ .global SYM(__ld_r13_to_r19_ret)
+ .global SYM(__ld_r13_to_r20_ret)
+ .global SYM(__ld_r13_to_r21_ret)
+ .global SYM(__ld_r13_to_r22_ret)
+ .global SYM(__ld_r13_to_r23_ret)
+ .global SYM(__ld_r13_to_r24_ret)
+ .global SYM(__ld_r13_to_r25_ret)
+ HIDDEN_FUNC(__ld_r13_to_r14_ret)
+ HIDDEN_FUNC(__ld_r13_to_r15_ret)
+ HIDDEN_FUNC(__ld_r13_to_r16_ret)
+ HIDDEN_FUNC(__ld_r13_to_r17_ret)
+ HIDDEN_FUNC(__ld_r13_to_r18_ret)
+ HIDDEN_FUNC(__ld_r13_to_r19_ret)
+ HIDDEN_FUNC(__ld_r13_to_r20_ret)
+ HIDDEN_FUNC(__ld_r13_to_r21_ret)
+ HIDDEN_FUNC(__ld_r13_to_r22_ret)
+ HIDDEN_FUNC(__ld_r13_to_r23_ret)
+ HIDDEN_FUNC(__ld_r13_to_r24_ret)
+ HIDDEN_FUNC(__ld_r13_to_r25_ret)
+ .section .text
+ .align 4
+SYM(__ld_r13_to_r25_ret):
+ ld r25, [sp,48]
+SYM(__ld_r13_to_r24_ret):
+ ld r24, [sp,44]
+SYM(__ld_r13_to_r23_ret):
+ ld r23, [sp,40]
+SYM(__ld_r13_to_r22_ret):
+ ld r22, [sp,36]
+SYM(__ld_r13_to_r21_ret):
+ ld r21, [sp,32]
+SYM(__ld_r13_to_r20_ret):
+ ld r20, [sp,28]
+SYM(__ld_r13_to_r19_ret):
+ ld r19, [sp,24]
+SYM(__ld_r13_to_r18_ret):
+ ld r18, [sp,20]
+SYM(__ld_r13_to_r17_ret):
+ ld r17, [sp,16]
+SYM(__ld_r13_to_r16_ret):
+ ld r16, [sp,12]
+SYM(__ld_r13_to_r15_ret):
+ ld r15, [sp,8]
+SYM(__ld_r13_to_r14_ret):
+ ld blink,[sp,r12]
+ ld_s r14, [sp,4]
+ ld.ab r13, [sp,r12]
+ j_s.d [%blink]
+ add_s sp,sp,4
+ ENDFUNC(__ld_r13_to_r14_ret)
+ ENDFUNC(__ld_r13_to_r15_ret)
+ ENDFUNC(__ld_r13_to_r16_ret)
+ ENDFUNC(__ld_r13_to_r17_ret)
+ ENDFUNC(__ld_r13_to_r18_ret)
+ ENDFUNC(__ld_r13_to_r19_ret)
+ ENDFUNC(__ld_r13_to_r20_ret)
+ ENDFUNC(__ld_r13_to_r21_ret)
+ ENDFUNC(__ld_r13_to_r22_ret)
+ ENDFUNC(__ld_r13_to_r23_ret)
+ ENDFUNC(__ld_r13_to_r24_ret)
+ ENDFUNC(__ld_r13_to_r25_ret)
diff --git a/arch/arc/lib/libgcc2.c b/arch/arc/lib/libgcc2.c
new file mode 100644
index 0000000..d5ad327
--- /dev/null
+++ b/arch/arc/lib/libgcc2.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 1989-2013 Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include "libgcc2.h"
+
+DWtype
+__ashldi3(DWtype u, shift_count_type b)
+{
+ if (b == 0)
+ return u;
+
+ const DWunion uu = {.ll = u};
+ const shift_count_type bm = W_TYPE_SIZE - b;
+ DWunion w;
+
+ if (bm <= 0) {
+ w.s.low = 0;
+ w.s.high = (UWtype)uu.s.low << -bm;
+ } else {
+ const UWtype carries = (UWtype) uu.s.low >> bm;
+
+ w.s.low = (UWtype)uu.s.low << b;
+ w.s.high = ((UWtype)uu.s.high << b) | carries;
+ }
+
+ return w.ll;
+}
+
+DWtype
+__ashrdi3(DWtype u, shift_count_type b)
+{
+ if (b == 0)
+ return u;
+
+ const DWunion uu = {.ll = u};
+ const shift_count_type bm = W_TYPE_SIZE - b;
+ DWunion w;
+
+ if (bm <= 0) {
+ /* w.s.high = 1..1 or 0..0 */
+ w.s.high = uu.s.high >> (W_TYPE_SIZE - 1);
+ w.s.low = uu.s.high >> -bm;
+ } else {
+ const UWtype carries = (UWtype) uu.s.high << bm;
+
+ w.s.high = uu.s.high >> b;
+ w.s.low = ((UWtype)uu.s.low >> b) | carries;
+ }
+
+ return w.ll;
+}
+
+DWtype
+__lshrdi3(DWtype u, shift_count_type b)
+{
+ if (b == 0)
+ return u;
+
+ const DWunion uu = {.ll = u};
+ const shift_count_type bm = W_TYPE_SIZE - b;
+ DWunion w;
+
+ if (bm <= 0) {
+ w.s.high = 0;
+ w.s.low = (UWtype)uu.s.high >> -bm;
+ } else {
+ const UWtype carries = (UWtype)uu.s.high << bm;
+
+ w.s.high = (UWtype)uu.s.high >> b;
+ w.s.low = ((UWtype)uu.s.low >> b) | carries;
+ }
+
+ return w.ll;
+}
+
+unsigned long
+udivmodsi4(unsigned long num, unsigned long den, int modwanted)
+{
+ unsigned long bit = 1;
+ unsigned long res = 0;
+
+ while (den < num && bit && !(den & (1L<<31))) {
+ den <<= 1;
+ bit <<= 1;
+ }
+
+ while (bit) {
+ if (num >= den) {
+ num -= den;
+ res |= bit;
+ }
+ bit >>= 1;
+ den >>= 1;
+ }
+
+ if (modwanted)
+ return num;
+
+ return res;
+}
+
+long
+__divsi3(long a, long b)
+{
+ int neg = 0;
+ long res;
+
+ if (a < 0) {
+ a = -a;
+ neg = !neg;
+ }
+
+ if (b < 0) {
+ b = -b;
+ neg = !neg;
+ }
+
+ res = udivmodsi4(a, b, 0);
+
+ if (neg)
+ res = -res;
+
+ return res;
+}
+
+long
+__modsi3(long a, long b)
+{
+ int neg = 0;
+ long res;
+
+ if (a < 0) {
+ a = -a;
+ neg = 1;
+ }
+
+ if (b < 0)
+ b = -b;
+
+ res = udivmodsi4(a, b, 1);
+
+ if (neg)
+ res = -res;
+
+ return res;
+}
+
+long
+__udivsi3(long a, long b)
+{
+ return udivmodsi4(a, b, 0);
+}
+
+long
+__umodsi3(long a, long b)
+{
+ return udivmodsi4(a, b, 1);
+}
diff --git a/arch/arc/lib/libgcc2.h b/arch/arc/lib/libgcc2.h
new file mode 100644
index 0000000..8813c3b
--- /dev/null
+++ b/arch/arc/lib/libgcc2.h
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 1989-2013 Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#define UNITS_PER_WORD 4 /* for ARC */
+#define BITS_PER_UNIT 8 /* for ARC */
+
+#define W_TYPE_SIZE (4 * BITS_PER_UNIT)
+
+#define MIN_UNITS_PER_WORD UNITS_PER_WORD
+
+/* Work out the largest "word" size that we can deal with on this target. */
+#if MIN_UNITS_PER_WORD > 4
+# define LIBGCC2_MAX_UNITS_PER_WORD 8
+#elif (MIN_UNITS_PER_WORD > 2 \
+ || (MIN_UNITS_PER_WORD > 1 && __SIZEOF_LONG_LONG__ > 4))
+# define LIBGCC2_MAX_UNITS_PER_WORD 4
+#else
+# define LIBGCC2_MAX_UNITS_PER_WORD MIN_UNITS_PER_WORD
+#endif
+
+/* Work out what word size we are using for this compilation.
+ The value can be set on the command line. */
+#ifndef LIBGCC2_UNITS_PER_WORD
+#define LIBGCC2_UNITS_PER_WORD LIBGCC2_MAX_UNITS_PER_WORD
+#endif
+
+typedef int QItype __attribute__ ((mode (QI)));
+typedef unsigned int UQItype __attribute__ ((mode (QI)));
+typedef int HItype __attribute__ ((mode (HI)));
+typedef unsigned int UHItype __attribute__ ((mode (HI)));
+#if MIN_UNITS_PER_WORD > 1
+/* These typedefs are usually forbidden on dsp's with UNITS_PER_WORD 1. */
+typedef int SItype __attribute__ ((mode (SI)));
+typedef unsigned int USItype __attribute__ ((mode (SI)));
+#if __SIZEOF_LONG_LONG__ > 4
+/* These typedefs are usually forbidden on archs with UNITS_PER_WORD 2. */
+typedef int DItype __attribute__ ((mode (DI)));
+typedef unsigned int UDItype __attribute__ ((mode (DI)));
+#if MIN_UNITS_PER_WORD > 4
+/* These typedefs are usually forbidden on archs with UNITS_PER_WORD 4. */
+typedef int TItype __attribute__ ((mode (TI)));
+typedef unsigned int UTItype __attribute__ ((mode (TI)));
+#endif
+#endif
+#endif
+
+#if LIBGCC2_UNITS_PER_WORD == 8
+#define W_TYPE_SIZE (8 * BITS_PER_UNIT)
+#define Wtype DItype
+#define UWtype UDItype
+#define HWtype DItype
+#define UHWtype UDItype
+#define DWtype TItype
+#define UDWtype UTItype
+#ifdef LIBGCC2_GNU_PREFIX
+#define __NW(a,b) __gnu_ ## a ## di ## b
+#define __NDW(a,b) __gnu_ ## a ## ti ## b
+#else
+#define __NW(a,b) __ ## a ## di ## b
+#define __NDW(a,b) __ ## a ## ti ## b
+#endif
+#elif LIBGCC2_UNITS_PER_WORD == 4
+#define W_TYPE_SIZE (4 * BITS_PER_UNIT)
+#define Wtype SItype
+#define UWtype USItype
+#define HWtype SItype
+#define UHWtype USItype
+#define DWtype DItype
+#define UDWtype UDItype
+#ifdef LIBGCC2_GNU_PREFIX
+#define __NW(a,b) __gnu_ ## a ## si ## b
+#define __NDW(a,b) __gnu_ ## a ## di ## b
+#else
+#define __NW(a,b) __ ## a ## si ## b
+#define __NDW(a,b) __ ## a ## di ## b
+#endif
+#elif LIBGCC2_UNITS_PER_WORD == 2
+#define W_TYPE_SIZE (2 * BITS_PER_UNIT)
+#define Wtype HItype
+#define UWtype UHItype
+#define HWtype HItype
+#define UHWtype UHItype
+#define DWtype SItype
+#define UDWtype USItype
+#ifdef LIBGCC2_GNU_PREFIX
+#define __NW(a,b) __gnu_ ## a ## hi ## b
+#define __NDW(a,b) __gnu_ ## a ## si ## b
+#else
+#define __NW(a,b) __ ## a ## hi ## b
+#define __NDW(a,b) __ ## a ## si ## b
+#endif
+#else
+#define W_TYPE_SIZE BITS_PER_UNIT
+#define Wtype QItype
+#define UWtype UQItype
+#define HWtype QItype
+#define UHWtype UQItype
+#define DWtype HItype
+#define UDWtype UHItype
+#ifdef LIBGCC2_GNU_PREFIX
+#define __NW(a,b) __gnu_ ## a ## qi ## b
+#define __NDW(a,b) __gnu_ ## a ## hi ## b
+#else
+#define __NW(a,b) __ ## a ## qi ## b
+#define __NDW(a,b) __ ## a ## hi ## b
+#endif
+#endif
+
+typedef int shift_count_type __attribute__((mode (__libgcc_shift_count__)));
+
+#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
+ struct DWstruct {Wtype high, low;};
+#else
+ struct DWstruct {Wtype low, high;};
+#endif
+
+/* We need this union to unpack/pack DImode values, since we don't have
+ any arithmetic yet. Incoming DImode parameters are stored into the
+ `ll' field, and the unpacked result is read from the struct `s'. */
+
+typedef union {
+ struct DWstruct s;
+ DWtype ll;
+} DWunion;
+
+#endif /* __ASM_LIBGCC_H */
--
2.1.0
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