mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 18:19:02 +00:00
275 lines
5.3 KiB
Diff
275 lines
5.3 KiB
Diff
--- a/arch/arm/lib/Makefile
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+++ b/arch/arm/lib/Makefile
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@@ -26,7 +26,6 @@ include $(TOPDIR)/config.mk
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LIB = $(obj)lib$(ARCH).o
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LIBGCC = $(obj)libgcc.o
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-ifndef CONFIG_SPL_BUILD
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GLSOBJS += _ashldi3.o
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GLSOBJS += _ashrdi3.o
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GLSOBJS += _divsi3.o
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@@ -34,9 +33,11 @@ GLSOBJS += _lshrdi3.o
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GLSOBJS += _modsi3.o
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GLSOBJS += _udivsi3.o
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GLSOBJS += _umodsi3.o
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+GLSOBJS += uldivmod.o
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GLCOBJS += div0.o
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+ifndef CONFIG_SPL_BUILD
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COBJS-y += board.o
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COBJS-y += bootm.o
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COBJS-$(CONFIG_SYS_L2_PL310) += cache-pl310.o
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--- /dev/null
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+++ b/arch/arm/lib/uldivmod.S
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@@ -0,0 +1,249 @@
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+/*
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+ * Copyright 2010, Google Inc.
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+ *
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+ * Brought in from coreboot uldivmod.S
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+ *
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+ * SPDX-License-Identifier: GPL-2.0
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+ */
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+
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+#include <linux/linkage.h>
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+#include <asm/assembler.h>
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+
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+/*
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+ * A, Q = r0 + (r1 << 32)
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+ * B, R = r2 + (r3 << 32)
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+ * A / B = Q ... R
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+ */
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+
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+#define ARM(x...) x
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+#define THUMB(x...)
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+
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+A_0 .req r0
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+A_1 .req r1
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+B_0 .req r2
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+B_1 .req r3
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+C_0 .req r4
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+C_1 .req r5
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+D_0 .req r6
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+D_1 .req r7
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+
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+Q_0 .req r0
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+Q_1 .req r1
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+R_0 .req r2
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+R_1 .req r3
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+
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+THUMB(
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+TMP .req r8
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+)
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+
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+.pushsection .text.__aeabi_uldivmod, "ax"
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+ENTRY(__aeabi_uldivmod)
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+
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+ stmfd sp!, {r4, r5, r6, r7, THUMB(TMP,) lr}
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+ @ Test if B == 0
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+ orrs ip, B_0, B_1 @ Z set -> B == 0
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+ beq L_div_by_0
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+ @ Test if B is power of 2: (B & (B - 1)) == 0
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+ subs C_0, B_0, #1
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+ sbc C_1, B_1, #0
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+ tst C_0, B_0
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+ tsteq B_1, C_1
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+ beq L_pow2
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+ @ Test if A_1 == B_1 == 0
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+ orrs ip, A_1, B_1
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+ beq L_div_32_32
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+
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+L_div_64_64:
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+/* CLZ only exists in ARM architecture version 5 and above. */
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+#ifdef HAVE_CLZ
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+ mov C_0, #1
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+ mov C_1, #0
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+ @ D_0 = clz A
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+ teq A_1, #0
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+ clz D_0, A_1
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+ clzeq ip, A_0
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+ addeq D_0, D_0, ip
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+ @ D_1 = clz B
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+ teq B_1, #0
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+ clz D_1, B_1
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+ clzeq ip, B_0
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+ addeq D_1, D_1, ip
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+ @ if clz B - clz A > 0
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+ subs D_0, D_1, D_0
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+ bls L_done_shift
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+ @ B <<= (clz B - clz A)
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+ subs D_1, D_0, #32
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+ rsb ip, D_0, #32
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+ movmi B_1, B_1, lsl D_0
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+ARM( orrmi B_1, B_1, B_0, lsr ip )
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+THUMB( lsrmi TMP, B_0, ip )
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+THUMB( orrmi B_1, B_1, TMP )
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+ movpl B_1, B_0, lsl D_1
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+ mov B_0, B_0, lsl D_0
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+ @ C = 1 << (clz B - clz A)
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+ movmi C_1, C_1, lsl D_0
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+ARM( orrmi C_1, C_1, C_0, lsr ip )
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+THUMB( lsrmi TMP, C_0, ip )
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+THUMB( orrmi C_1, C_1, TMP )
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+ movpl C_1, C_0, lsl D_1
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+ mov C_0, C_0, lsl D_0
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+L_done_shift:
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+ mov D_0, #0
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+ mov D_1, #0
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+ @ C: current bit; D: result
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+#else
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+ @ C: current bit; D: result
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+ mov C_0, #1
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+ mov C_1, #0
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+ mov D_0, #0
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+ mov D_1, #0
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+L_lsl_4:
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+ cmp B_1, #0x10000000
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+ cmpcc B_1, A_1
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+ cmpeq B_0, A_0
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+ bcs L_lsl_1
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+ @ B <<= 4
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+ mov B_1, B_1, lsl #4
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+ orr B_1, B_1, B_0, lsr #28
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+ mov B_0, B_0, lsl #4
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+ @ C <<= 4
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+ mov C_1, C_1, lsl #4
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+ orr C_1, C_1, C_0, lsr #28
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+ mov C_0, C_0, lsl #4
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+ b L_lsl_4
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+L_lsl_1:
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+ cmp B_1, #0x80000000
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+ cmpcc B_1, A_1
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+ cmpeq B_0, A_0
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+ bcs L_subtract
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+ @ B <<= 1
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+ mov B_1, B_1, lsl #1
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+ orr B_1, B_1, B_0, lsr #31
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+ mov B_0, B_0, lsl #1
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+ @ C <<= 1
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+ mov C_1, C_1, lsl #1
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+ orr C_1, C_1, C_0, lsr #31
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+ mov C_0, C_0, lsl #1
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+ b L_lsl_1
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+#endif
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+L_subtract:
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+ @ if A >= B
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+ cmp A_1, B_1
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+ cmpeq A_0, B_0
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+ bcc L_update
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+ @ A -= B
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+ subs A_0, A_0, B_0
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+ sbc A_1, A_1, B_1
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+ @ D |= C
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+ orr D_0, D_0, C_0
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+ orr D_1, D_1, C_1
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+L_update:
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+ @ if A == 0: break
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+ orrs ip, A_1, A_0
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+ beq L_exit
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+ @ C >>= 1
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+ movs C_1, C_1, lsr #1
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+ movs C_0, C_0, rrx
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+ @ if C == 0: break
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+ orrs ip, C_1, C_0
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+ beq L_exit
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+ @ B >>= 1
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+ movs B_1, B_1, lsr #1
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+ mov B_0, B_0, rrx
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+ b L_subtract
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+L_exit:
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+ @ Note: A, B & Q, R are aliases
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+ mov R_0, A_0
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+ mov R_1, A_1
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+ mov Q_0, D_0
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+ mov Q_1, D_1
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+ ldmfd sp!, {r4, r5, r6, r7, THUMB(TMP,) pc}
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+
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+L_div_32_32:
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+ @ Note: A_0 & r0 are aliases
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+ @ Q_1 r1
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+ mov r1, B_0
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+ bl __aeabi_uidivmod
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+ mov R_0, r1
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+ mov R_1, #0
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+ mov Q_1, #0
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+ ldmfd sp!, {r4, r5, r6, r7, THUMB(TMP,) pc}
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+
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+L_pow2:
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+#ifdef HAVE_CLZ
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+ @ Note: A, B and Q, R are aliases
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+ @ R = A & (B - 1)
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+ and C_0, A_0, C_0
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+ and C_1, A_1, C_1
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+ @ Q = A >> log2(B)
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+ @ Note: B must not be 0 here!
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+ clz D_0, B_0
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+ add D_1, D_0, #1
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+ rsbs D_0, D_0, #31
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+ bpl L_1
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+ clz D_0, B_1
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+ rsb D_0, D_0, #31
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+ mov A_0, A_1, lsr D_0
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+ add D_0, D_0, #32
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+L_1:
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+ movpl A_0, A_0, lsr D_0
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+ARM( orrpl A_0, A_0, A_1, lsl D_1 )
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+THUMB( lslpl TMP, A_1, D_1 )
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+THUMB( orrpl A_0, A_0, TMP )
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+ mov A_1, A_1, lsr D_0
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+ @ Mov back C to R
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+ mov R_0, C_0
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+ mov R_1, C_1
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+ ldmfd sp!, {r4, r5, r6, r7, THUMB(TMP,) pc}
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+#else
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+ @ Note: A, B and Q, R are aliases
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+ @ R = A & (B - 1)
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+ and C_0, A_0, C_0
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+ and C_1, A_1, C_1
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+ @ Q = A >> log2(B)
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+ @ Note: B must not be 0 here!
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+ @ Count the leading zeroes in B.
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+ mov D_0, #0
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+ orrs B_0, B_0, B_0
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+ @ If B is greater than 1 << 31, divide A and B by 1 << 32.
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+ moveq A_0, A_1
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+ moveq A_1, #0
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+ moveq B_0, B_1
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+ @ Count the remaining leading zeroes in B.
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+ movs B_1, B_0, lsl #16
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+ addeq D_0, #16
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+ moveq B_0, B_0, lsr #16
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+ tst B_0, #0xff
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+ addeq D_0, #8
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+ moveq B_0, B_0, lsr #8
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+ tst B_0, #0xf
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+ addeq D_0, #4
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+ moveq B_0, B_0, lsr #4
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+ tst B_0, #0x3
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+ addeq D_0, #2
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+ moveq B_0, B_0, lsr #2
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+ tst B_0, #0x1
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+ addeq D_0, #1
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+ @ Shift A to the right by the appropriate amount.
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+ rsb D_1, D_0, #32
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+ mov Q_0, A_0, lsr D_0
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+ ARM( orr Q_0, Q_0, A_1, lsl D_1 )
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+ THUMB( lsl A_1, D_1 )
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+ THUMB( orr Q_0, A_1 )
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+ mov Q_1, A_1, lsr D_0
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+ @ Move C to R
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+ mov R_0, C_0
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+ mov R_1, C_1
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+ ldmfd sp!, {r4, r5, r6, r7, THUMB(TMP,) pc}
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+#endif
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+
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+L_div_by_0:
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+ bl __div0
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+ @ As wrong as it could be
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+ mov Q_0, #0
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+ mov Q_1, #0
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+ mov R_0, #0
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+ mov R_1, #0
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+ ldmfd sp!, {r4, r5, r6, r7, THUMB(TMP,) pc}
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+ENDPROC(__aeabi_uldivmod)
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+.popsection
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