]> git.dujemihanovic.xyz Git - u-boot.git/commitdiff
arc: build libgcc in U-Boot
authorAlexey Brodkin <abrodkin@synopsys.com>
Tue, 3 Feb 2015 10:58:20 +0000 (13:58 +0300)
committerAlexey Brodkin <abrodkin@synopsys.com>
Mon, 9 Feb 2015 13:41:20 +0000 (16:41 +0300)
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@synopsys.com>
arch/Kconfig
arch/arc/Kconfig
arch/arc/config.mk
arch/arc/lib/Makefile
arch/arc/lib/_millicodethunk.S [new file with mode: 0644]
arch/arc/lib/libgcc2.c [new file with mode: 0644]
arch/arc/lib/libgcc2.h [new file with mode: 0644]

index f63cc5a7e9440416c351e612eb5c8615693aa037..132123bcaf1c8da5c2e029508dc3a60dca2e2531 100644 (file)
@@ -4,6 +4,7 @@ choice
 
 config ARC
        bool "ARC architecture"
+       select HAVE_PRIVATE_LIBGCC
 
 config ARM
        bool "ARM architecture"
index 04fc7b6ab2e8ba283e2bf8929a42fd4efcebdeeb..a8dc4e2336da12aeef0c696be61267688492d925 100644 (file)
@@ -4,6 +4,9 @@ menu "ARC architecture"
 config SYS_ARCH
        default "arc"
 
+config USE_PRIVATE_LIBGCC
+       default y
+
 config SYS_CPU
        default "arcv1"
 
index 3e75e606b3fde6cf876d52183f1a8eb372317b4b..f1e81b689502e94126c74d78c6c6bfa670e5478b 100644 (file)
@@ -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),)
index bae44199a41b16c7662607d77bff0715def97b83..b8028c91e11df045b29048521631191fe7cfd180 100644 (file)
@@ -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 (file)
index 0000000..b332416
--- /dev/null
@@ -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),@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 (file)
index 0000000..d5ad327
--- /dev/null
@@ -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 (file)
index 0000000..8813c3b
--- /dev/null
@@ -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 */