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sh: Provide sdivsi3/udivsi3/udivdi3 for sh64, kill off libgcc linking.

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This moves in the necessary libgcc bits and kills off the libgcc linking
for sh64 kernels as well.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-12-12 16:53:14 +09:00
parent 209aa4fdc3
commit 180ae2037f
6 changed files with 314 additions and 5 deletions
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4
arch/sh/Makefile
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@ -177,10 +177,8 @@ KBUILD_CFLAGS += -pipe $(cflags-y)
KBUILD_CPPFLAGS += $(cflags-y)
KBUILD_AFLAGS += $(cflags-y)
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
libs-$(CONFIG_SUPERH32) := arch/sh/lib/ $(libs-y)
libs-$(CONFIG_SUPERH64) := arch/sh/lib64/ $(libs-y) $(LIBGCC)
libs-$(CONFIG_SUPERH64) := arch/sh/lib64/ $(libs-y)
PHONY += maketools FORCE

2
arch/sh/kernel/sh_ksyms_64.c
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@ -76,7 +76,5 @@ EXPORT_SYMBOL(strcpy);
#define DECLARE_EXPORT(name) extern void name(void);EXPORT_SYMBOL(name)
DECLARE_EXPORT(__sdivsi3);
DECLARE_EXPORT(__sdivsi3_2);
DECLARE_EXPORT(__muldi3);
DECLARE_EXPORT(__udivsi3);
DECLARE_EXPORT(__div_table);

3
arch/sh/lib64/Makefile
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@ -12,3 +12,6 @@
# Panic should really be compiled as PIC
lib-y := udelay.o c-checksum.o dbg.o panic.o memcpy.o memset.o \
copy_user_memcpy.o copy_page.o clear_page.o strcpy.o strlen.o
# Extracted from libgcc
lib-y += udivsi3.o udivdi3.o sdivsi3.o

131
arch/sh/lib64/sdivsi3.S Normal file
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@ -0,0 +1,131 @@
.global __sdivsi3
.section .text..SHmedia32,"ax"
.align 2
/* inputs: r4,r5 */
/* clobbered: r1,r18,r19,r20,r21,r25,tr0 */
/* result in r0 */
__sdivsi3:
ptb __div_table,tr0
nsb r5, r1
shlld r5, r1, r25 /* normalize; [-2 ..1, 1..2) in s2.62 */
shari r25, 58, r21 /* extract 5(6) bit index (s2.4 with hole -1..1) */
/* bubble */
gettr tr0,r20
ldx.ub r20, r21, r19 /* u0.8 */
shari r25, 32, r25 /* normalize to s2.30 */
shlli r21, 1, r21
muls.l r25, r19, r19 /* s2.38 */
ldx.w r20, r21, r21 /* s2.14 */
ptabs r18, tr0
shari r19, 24, r19 /* truncate to s2.14 */
sub r21, r19, r19 /* some 11 bit inverse in s1.14 */
muls.l r19, r19, r21 /* u0.28 */
sub r63, r1, r1
addi r1, 92, r1
muls.l r25, r21, r18 /* s2.58 */
shlli r19, 45, r19 /* multiply by two and convert to s2.58 */
/* bubble */
sub r19, r18, r18
shari r18, 28, r18 /* some 22 bit inverse in s1.30 */
muls.l r18, r25, r0 /* s2.60 */
muls.l r18, r4, r25 /* s32.30 */
/* bubble */
shari r0, 16, r19 /* s-16.44 */
muls.l r19, r18, r19 /* s-16.74 */
shari r25, 63, r0
shari r4, 14, r18 /* s19.-14 */
shari r19, 30, r19 /* s-16.44 */
muls.l r19, r18, r19 /* s15.30 */
xor r21, r0, r21 /* You could also use the constant 1 << 27. */
add r21, r25, r21
sub r21, r19, r21
shard r21, r1, r21
sub r21, r0, r0
blink tr0, r63
/* This table has been generated by divtab.c .
Defects for bias -330:
Max defect: 6.081536e-07 at -1.000000e+00
Min defect: 2.849516e-08 at 1.030651e+00
Max 2nd step defect: 9.606539e-12 at -1.000000e+00
Min 2nd step defect: 0.000000e+00 at 0.000000e+00
Defect at 1: 1.238659e-07
Defect at -2: 1.061708e-07 */
.balign 2
.type __div_table,@object
.size __div_table,128
/* negative division constants */
.word -16638
.word -17135
.word -17737
.word -18433
.word -19103
.word -19751
.word -20583
.word -21383
.word -22343
.word -23353
.word -24407
.word -25582
.word -26863
.word -28382
.word -29965
.word -31800
/* negative division factors */
.byte 66
.byte 70
.byte 75
.byte 81
.byte 87
.byte 93
.byte 101
.byte 109
.byte 119
.byte 130
.byte 142
.byte 156
.byte 172
.byte 192
.byte 214
.byte 241
.skip 16
.global __div_table
__div_table:
.skip 16
/* positive division factors */
.byte 241
.byte 214
.byte 192
.byte 172
.byte 156
.byte 142
.byte 130
.byte 119
.byte 109
.byte 101
.byte 93
.byte 87
.byte 81
.byte 75
.byte 70
.byte 66
/* positive division constants */
.word 31801
.word 29966
.word 28383
.word 26864
.word 25583
.word 24408
.word 23354
.word 22344
.word 21384
.word 20584
.word 19752
.word 19104
.word 18434
.word 17738
.word 17136
.word 16639

120
arch/sh/lib64/udivdi3.S Normal file
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@ -0,0 +1,120 @@
.section .text..SHmedia32,"ax"
.align 2
.global __udivdi3
__udivdi3:
shlri r3,1,r4
nsb r4,r22
shlld r3,r22,r6
shlri r6,49,r5
movi 0xffffffffffffbaf1,r21 /* .l shift count 17. */
sub r21,r5,r1
mmulfx.w r1,r1,r4
mshflo.w r1,r63,r1
sub r63,r22,r20 // r63 == 64 % 64
mmulfx.w r5,r4,r4
pta large_divisor,tr0
addi r20,32,r9
msub.w r1,r4,r1
madd.w r1,r1,r1
mmulfx.w r1,r1,r4
shlri r6,32,r7
bgt/u r9,r63,tr0 // large_divisor
mmulfx.w r5,r4,r4
shlri r2,32+14,r19
addi r22,-31,r0
msub.w r1,r4,r1
mulu.l r1,r7,r4
addi r1,-3,r5
mulu.l r5,r19,r5
sub r63,r4,r4 // Negate to make sure r1 ends up <= 1/r2
shlri r4,2,r4 /* chop off leading %0000000000000000 001.00000000000 - or, as
the case may be, %0000000000000000 000.11111111111, still */
muls.l r1,r4,r4 /* leaving at least one sign bit. */
mulu.l r5,r3,r8
mshalds.l r1,r21,r1
shari r4,26,r4
shlld r8,r0,r8
add r1,r4,r1 // 31 bit unsigned reciprocal now in r1 (msb equiv. 0.5)
sub r2,r8,r2
/* Can do second step of 64 : 32 div now, using r1 and the rest in r2. */
shlri r2,22,r21
mulu.l r21,r1,r21
shlld r5,r0,r8
addi r20,30-22,r0
shlrd r21,r0,r21
mulu.l r21,r3,r5
add r8,r21,r8
mcmpgt.l r21,r63,r21 // See Note 1
addi r20,30,r0
mshfhi.l r63,r21,r21
sub r2,r5,r2
andc r2,r21,r2
/* small divisor: need a third divide step */
mulu.l r2,r1,r7
ptabs r18,tr0
addi r2,1,r2
shlrd r7,r0,r7
mulu.l r7,r3,r5
add r8,r7,r8
sub r2,r3,r2
cmpgt r2,r5,r5
add r8,r5,r2
/* could test r3 here to check for divide by zero. */
blink tr0,r63
large_divisor:
mmulfx.w r5,r4,r4
shlrd r2,r9,r25
shlri r25,32,r8
msub.w r1,r4,r1
mulu.l r1,r7,r4
addi r1,-3,r5
mulu.l r5,r8,r5
sub r63,r4,r4 // Negate to make sure r1 ends up <= 1/r2
shlri r4,2,r4 /* chop off leading %0000000000000000 001.00000000000 - or, as
the case may be, %0000000000000000 000.11111111111, still */
muls.l r1,r4,r4 /* leaving at least one sign bit. */
shlri r5,14-1,r8
mulu.l r8,r7,r5
mshalds.l r1,r21,r1
shari r4,26,r4
add r1,r4,r1 // 31 bit unsigned reciprocal now in r1 (msb equiv. 0.5)
sub r25,r5,r25
/* Can do second step of 64 : 32 div now, using r1 and the rest in r25. */
shlri r25,22,r21
mulu.l r21,r1,r21
pta no_lo_adj,tr0
addi r22,32,r0
shlri r21,40,r21
mulu.l r21,r7,r5
add r8,r21,r8
shlld r2,r0,r2
sub r25,r5,r25
bgtu/u r7,r25,tr0 // no_lo_adj
addi r8,1,r8
sub r25,r7,r25
no_lo_adj:
mextr4 r2,r25,r2
/* large_divisor: only needs a few adjustments. */
mulu.l r8,r6,r5
ptabs r18,tr0
/* bubble */
cmpgtu r5,r2,r5
sub r8,r5,r2
blink tr0,r63
/* Note 1: To shift the result of the second divide stage so that the result
always fits into 32 bits, yet we still reduce the rest sufficiently
would require a lot of instructions to do the shifts just right. Using
the full 64 bit shift result to multiply with the divisor would require
four extra instructions for the upper 32 bits (shift / mulu / shift / sub).
Fortunately, if the upper 32 bits of the shift result are nonzero, we
know that the rest after taking this partial result into account will
fit into 32 bits. So we just clear the upper 32 bits of the rest if the
upper 32 bits of the partial result are nonzero. */

59
arch/sh/lib64/udivsi3.S Normal file
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@ -0,0 +1,59 @@
.global __udivsi3
.section .text..SHmedia32,"ax"
.align 2
/*
inputs: r4,r5
clobbered: r18,r19,r20,r21,r22,r25,tr0
result in r0.
*/
__udivsi3:
addz.l r5,r63,r22
nsb r22,r0
shlld r22,r0,r25
shlri r25,48,r25
movi 0xffffffffffffbb0c,r20 /* shift count eqiv 76 */
sub r20,r25,r21
mmulfx.w r21,r21,r19
mshflo.w r21,r63,r21
ptabs r18,tr0
mmulfx.w r25,r19,r19
sub r20,r0,r0
/* bubble */
msub.w r21,r19,r19
/*
* It would be nice for scheduling to do this add to r21 before
* the msub.w, but we need a different value for r19 to keep
* errors under control.
*/
addi r19,-2,r21
mulu.l r4,r21,r18
mmulfx.w r19,r19,r19
shlli r21,15,r21
shlrd r18,r0,r18
mulu.l r18,r22,r20
mmacnfx.wl r25,r19,r21
/* bubble */
sub r4,r20,r25
mulu.l r25,r21,r19
addi r0,14,r0
/* bubble */
shlrd r19,r0,r19
mulu.l r19,r22,r20
add r18,r19,r18
/* bubble */
sub.l r25,r20,r25
mulu.l r25,r21,r19
addz.l r25,r63,r25
sub r25,r22,r25
shlrd r19,r0,r19
mulu.l r19,r22,r20
addi r25,1,r25
add r18,r19,r18
cmpgt r25,r20,r25
add.l r18,r25,r0
blink tr0,r63