/* Miscellaneous BPABI functions.
- Copyright (C) 2003-2013 Free Software Foundation, Inc.
+ Copyright (C) 2003-2020 Free Software Foundation, Inc.
Contributed by CodeSourcery, LLC.
This file is free software; you can redistribute it and/or modify it
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
+ .cfi_sections .debug_frame
+
#ifdef __ARM_EABI__
/* Some attributes that are common to all routines in this file. */
/* Tag_ABI_align_needed: This code does not require 8-byte
/* Tail-call to divide-by-zero handlers which may be overridden by the user,
so unwinding works properly. */
#if defined(__thumb2__)
- cbnz yyh, 1f
- cbnz yyl, 1f
+ cbnz yyh, 2f
+ cbnz yyl, 2f
cmp xxh, #0
+ .ifc \signed, unsigned
do_it eq
cmpeq xxl, #0
- .ifc \signed, unsigned
- beq 2f
- mov xxh, #0xffffffff
- mov xxl, xxh
-2:
+ do_it ne, t
+ movne xxh, #0xffffffff
+ movne xxl, #0xffffffff
.else
- do_it lt, t
+ do_it lt, tt
movlt xxl, #0
movlt xxh, #0x80000000
- do_it gt, t
- movgt xxh, #0x7fffffff
- movgt xxl, #0xffffffff
+ blt 1f
+ do_it eq
+ cmpeq xxl, #0
+ do_it ne, t
+ movne xxh, #0x7fffffff
+ movne xxl, #0xffffffff
.endif
+1:
b SYM (__aeabi_ldiv0) __PLT__
-1:
+2:
#else
/* Note: Thumb-1 code calls via an ARM shim on processors which
support ARM mode. */
cmpeq yyl, #0
bne 2f
cmp xxh, #0
- cmpeq xxl, #0
.ifc \signed, unsigned
+ cmpeq xxl, #0
movne xxh, #0xffffffff
movne xxl, #0xffffffff
.else
movlt xxh, #0x80000000
movlt xxl, #0
- movgt xxh, #0x7fffffff
- movgt xxl, #0xffffffff
+ blt 1f
+ cmpeq xxl, #0
+ movne xxh, #0x7fffffff
+ movne xxl, #0xffffffff
.endif
+1:
b SYM (__aeabi_ldiv0) __PLT__
2:
#endif
.endm
-#ifdef L_aeabi_ldivmod
+/* we can use STRD/LDRD on v5TE and later, and any Thumb-2 architecture. */
+#if (defined(__ARM_EABI__) \
+ && (defined(__thumb2__) \
+ || (__ARM_ARCH >= 5 && defined(__TARGET_FEATURE_DSP))))
+#define CAN_USE_LDRD 1
+#else
+#define CAN_USE_LDRD 0
+#endif
-ARM_FUNC_START aeabi_ldivmod
- cfi_start __aeabi_ldivmod, LSYM(Lend_aeabi_ldivmod)
- test_div_by_zero signed
+/* set up stack from for call to __udivmoddi4. At the end of the macro the
+ stack is arranged as follows:
+ sp+12 / space for remainder
+ sp+8 \ (written by __udivmoddi4)
+ sp+4 lr
+ sp+0 sp+8 [rp (remainder pointer) argument for __udivmoddi4]
- sub sp, sp, #8
-#if defined(__thumb2__)
- mov ip, sp
- push {ip, lr}
+ */
+.macro push_for_divide fname
+#if defined(__thumb2__) && CAN_USE_LDRD
+ sub ip, sp, #8
+ strd ip, lr, [sp, #-16]!
+#else
+ sub sp, sp, #8
+ do_push {sp, lr}
+#endif
+ .cfi_adjust_cfa_offset 16
+ .cfi_offset 14, -12
+.endm
+
+/* restore stack */
+.macro pop_for_divide
+ ldr lr, [sp, #4]
+#if CAN_USE_LDRD
+ ldrd r2, r3, [sp, #8]
+ add sp, sp, #16
#else
- do_push {sp, lr}
+ add sp, sp, #8
+ do_pop {r2, r3}
#endif
-98: cfi_push 98b - __aeabi_ldivmod, 0xe, -0xc, 0x10
- bl SYM(__gnu_ldivmod_helper) __PLT__
- ldr lr, [sp, #4]
- add sp, sp, #8
- do_pop {r2, r3}
+ .cfi_restore 14
+ .cfi_adjust_cfa_offset 0
+.endm
+
+#ifdef L_aeabi_ldivmod
+
+/* Perform 64 bit signed division.
+ Inputs:
+ r0:r1 numerator
+ r2:r3 denominator
+ Outputs:
+ r0:r1 quotient
+ r2:r3 remainder
+ */
+ARM_FUNC_START aeabi_ldivmod
+ .cfi_startproc
+ test_div_by_zero signed
+
+ push_for_divide __aeabi_ldivmod
+ cmp xxh, #0
+ blt 1f
+ cmp yyh, #0
+ blt 2f
+ /* arguments in (r0:r1), (r2:r3) and *sp */
+ bl SYM(__udivmoddi4) __PLT__
+ .cfi_remember_state
+ pop_for_divide
RET
- cfi_end LSYM(Lend_aeabi_ldivmod)
+
+1: /* xxh:xxl is negative */
+ .cfi_restore_state
+ negs xxl, xxl
+ sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ cmp yyh, #0
+ blt 3f
+ /* arguments in (r0:r1), (r2:r3) and *sp */
+ bl SYM(__udivmoddi4) __PLT__
+ .cfi_remember_state
+ pop_for_divide
+ negs xxl, xxl
+ sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ negs yyl, yyl
+ sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ RET
+
+2: /* only yyh:yyl is negative */
+ .cfi_restore_state
+ negs yyl, yyl
+ sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ /* arguments in (r0:r1), (r2:r3) and *sp */
+ bl SYM(__udivmoddi4) __PLT__
+ .cfi_remember_state
+ pop_for_divide
+ negs xxl, xxl
+ sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ RET
+
+3: /* both xxh:xxl and yyh:yyl are negative */
+ .cfi_restore_state
+ negs yyl, yyl
+ sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ /* arguments in (r0:r1), (r2:r3) and *sp */
+ bl SYM(__udivmoddi4) __PLT__
+ pop_for_divide
+ negs yyl, yyl
+ sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
+ RET
+
+ .cfi_endproc
#endif /* L_aeabi_ldivmod */
#ifdef L_aeabi_uldivmod
+/* Perform 64 bit signed division.
+ Inputs:
+ r0:r1 numerator
+ r2:r3 denominator
+ Outputs:
+ r0:r1 quotient
+ r2:r3 remainder
+ */
ARM_FUNC_START aeabi_uldivmod
- cfi_start __aeabi_uldivmod, LSYM(Lend_aeabi_uldivmod)
- test_div_by_zero unsigned
+ .cfi_startproc
+ test_div_by_zero unsigned
- sub sp, sp, #8
-#if defined(__thumb2__)
- mov ip, sp
- push {ip, lr}
-#else
- do_push {sp, lr}
-#endif
-98: cfi_push 98b - __aeabi_uldivmod, 0xe, -0xc, 0x10
- bl SYM(__gnu_uldivmod_helper) __PLT__
- ldr lr, [sp, #4]
- add sp, sp, #8
- do_pop {r2, r3}
+ push_for_divide __aeabi_uldivmod
+ /* arguments in (r0:r1), (r2:r3) and *sp */
+ bl SYM(__udivmoddi4) __PLT__
+ pop_for_divide
RET
- cfi_end LSYM(Lend_aeabi_uldivmod)
+ .cfi_endproc
#endif /* L_aeabi_divmod */
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