265 lines
5.8 KiB
ArmAsm
265 lines
5.8 KiB
ArmAsm
/* Miscellaneous BPABI functions.
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Copyright (C) 2003-2016 Free Software Foundation, Inc.
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Contributed by CodeSourcery, LLC.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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.cfi_sections .debug_frame
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#ifdef __ARM_EABI__
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/* Some attributes that are common to all routines in this file. */
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/* Tag_ABI_align_needed: This code does not require 8-byte
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alignment from the caller. */
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/* .eabi_attribute 24, 0 -- default setting. */
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/* Tag_ABI_align_preserved: This code preserves 8-byte
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alignment in any callee. */
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.eabi_attribute 25, 1
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#endif /* __ARM_EABI__ */
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#ifdef L_aeabi_lcmp
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ARM_FUNC_START aeabi_lcmp
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cmp xxh, yyh
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do_it lt
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movlt r0, #-1
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do_it gt
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movgt r0, #1
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do_it ne
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RETc(ne)
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subs r0, xxl, yyl
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do_it lo
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movlo r0, #-1
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do_it hi
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movhi r0, #1
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RET
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FUNC_END aeabi_lcmp
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#endif /* L_aeabi_lcmp */
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#ifdef L_aeabi_ulcmp
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ARM_FUNC_START aeabi_ulcmp
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cmp xxh, yyh
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do_it lo
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movlo r0, #-1
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do_it hi
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movhi r0, #1
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do_it ne
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RETc(ne)
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cmp xxl, yyl
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do_it lo
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movlo r0, #-1
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do_it hi
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movhi r0, #1
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do_it eq
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moveq r0, #0
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RET
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FUNC_END aeabi_ulcmp
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#endif /* L_aeabi_ulcmp */
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.macro test_div_by_zero signed
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/* Tail-call to divide-by-zero handlers which may be overridden by the user,
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so unwinding works properly. */
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#if defined(__thumb2__)
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cbnz yyh, 2f
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cbnz yyl, 2f
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cmp xxh, #0
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.ifc \signed, unsigned
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do_it eq
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cmpeq xxl, #0
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do_it ne, t
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movne xxh, #0xffffffff
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movne xxl, #0xffffffff
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.else
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do_it lt, tt
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movlt xxl, #0
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movlt xxh, #0x80000000
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blt 1f
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do_it eq
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cmpeq xxl, #0
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do_it ne, t
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movne xxh, #0x7fffffff
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movne xxl, #0xffffffff
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.endif
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1:
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b SYM (__aeabi_ldiv0) __PLT__
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2:
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#else
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/* Note: Thumb-1 code calls via an ARM shim on processors which
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support ARM mode. */
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cmp yyh, #0
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cmpeq yyl, #0
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bne 2f
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cmp xxh, #0
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.ifc \signed, unsigned
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cmpeq xxl, #0
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movne xxh, #0xffffffff
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movne xxl, #0xffffffff
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.else
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movlt xxh, #0x80000000
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movlt xxl, #0
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blt 1f
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cmpeq xxl, #0
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movne xxh, #0x7fffffff
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movne xxl, #0xffffffff
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.endif
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1:
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b SYM (__aeabi_ldiv0) __PLT__
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2:
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#endif
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.endm
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/* we can use STRD/LDRD on v5TE and later, and any Thumb-2 architecture. */
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#if (defined(__ARM_EABI__) \
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&& (defined(__thumb2__) \
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|| (__ARM_ARCH >= 5 && defined(__TARGET_FEATURE_DSP))))
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#define CAN_USE_LDRD 1
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#else
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#define CAN_USE_LDRD 0
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#endif
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/* set up stack from for call to __udivmoddi4. At the end of the macro the
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stack is arranged as follows:
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sp+12 / space for remainder
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sp+8 \ (written by __udivmoddi4)
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sp+4 lr
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sp+0 sp+8 [rp (remainder pointer) argument for __udivmoddi4]
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*/
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.macro push_for_divide fname
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#if defined(__thumb2__) && CAN_USE_LDRD
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sub ip, sp, #8
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strd ip, lr, [sp, #-16]!
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#else
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sub sp, sp, #8
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do_push {sp, lr}
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#endif
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.cfi_adjust_cfa_offset 16
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.cfi_offset 14, -12
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.endm
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/* restore stack */
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.macro pop_for_divide
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ldr lr, [sp, #4]
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#if CAN_USE_LDRD
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ldrd r2, r3, [sp, #8]
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add sp, sp, #16
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#else
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add sp, sp, #8
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do_pop {r2, r3}
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#endif
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.cfi_restore 14
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.cfi_adjust_cfa_offset 0
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.endm
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#ifdef L_aeabi_ldivmod
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/* Perform 64 bit signed division.
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Inputs:
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r0:r1 numerator
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r2:r3 denominator
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Outputs:
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r0:r1 quotient
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r2:r3 remainder
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*/
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ARM_FUNC_START aeabi_ldivmod
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.cfi_startproc
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test_div_by_zero signed
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push_for_divide __aeabi_ldivmod
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cmp xxh, #0
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blt 1f
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cmp yyh, #0
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blt 2f
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/* arguments in (r0:r1), (r2:r3) and *sp */
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bl SYM(__udivmoddi4) __PLT__
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.cfi_remember_state
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pop_for_divide
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RET
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1: /* xxh:xxl is negative */
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.cfi_restore_state
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negs xxl, xxl
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sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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cmp yyh, #0
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blt 3f
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/* arguments in (r0:r1), (r2:r3) and *sp */
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bl SYM(__udivmoddi4) __PLT__
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.cfi_remember_state
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pop_for_divide
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negs xxl, xxl
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sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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negs yyl, yyl
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sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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RET
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2: /* only yyh:yyl is negative */
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.cfi_restore_state
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negs yyl, yyl
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sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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/* arguments in (r0:r1), (r2:r3) and *sp */
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bl SYM(__udivmoddi4) __PLT__
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.cfi_remember_state
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pop_for_divide
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negs xxl, xxl
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sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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RET
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3: /* both xxh:xxl and yyh:yyl are negative */
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.cfi_restore_state
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negs yyl, yyl
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sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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/* arguments in (r0:r1), (r2:r3) and *sp */
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bl SYM(__udivmoddi4) __PLT__
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pop_for_divide
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negs yyl, yyl
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sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
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RET
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.cfi_endproc
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#endif /* L_aeabi_ldivmod */
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#ifdef L_aeabi_uldivmod
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/* Perform 64 bit signed division.
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Inputs:
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r0:r1 numerator
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r2:r3 denominator
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Outputs:
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r0:r1 quotient
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r2:r3 remainder
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*/
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ARM_FUNC_START aeabi_uldivmod
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.cfi_startproc
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test_div_by_zero unsigned
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push_for_divide __aeabi_uldivmod
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/* arguments in (r0:r1), (r2:r3) and *sp */
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bl SYM(__udivmoddi4) __PLT__
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pop_for_divide
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RET
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.cfi_endproc
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#endif /* L_aeabi_divmod */
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