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/* Miscellaneous BPABI functions.  ARMv6M implementation

   Copyright (C) 2006, 2008, 2009, 2010  Free Software Foundation, Inc.
   Contributed by CodeSourcery.

   This file is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3, or (at your option) any
   later version.

   This file is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

#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
           alignment from the caller.  */
        /* .eabi_attribute 24, 0  -- default setting.  */
        /* Tag_ABI_align_preserved: This code preserves 8-byte
           alignment in any callee.  */
        .eabi_attribute 25, 1
#endif /* __ARM_EABI__ */

#ifdef L_aeabi_lcmp

FUNC_START aeabi_lcmp
        cmp     xxh, yyh
        beq     1f
        bgt     2f
        mov     r0, #1
        neg     r0, r0
        RET
2:
        mov     r0, #1
        RET
1:
        sub     r0, xxl, yyl
        beq     1f
        bhi     2f
        mov     r0, #1
        neg     r0, r0
        RET
2:
        mov     r0, #1
1:
        RET
        FUNC_END aeabi_lcmp

#endif /* L_aeabi_lcmp */
        
#ifdef L_aeabi_ulcmp

FUNC_START aeabi_ulcmp
        cmp     xxh, yyh
        bne     1f
        sub     r0, xxl, yyl
        beq     2f
1:
        bcs     1f
        mov     r0, #1
        neg     r0, r0
        RET
1:
        mov     r0, #1
2:
        RET
        FUNC_END aeabi_ulcmp

#endif /* L_aeabi_ulcmp */

.macro test_div_by_zero signed
        cmp     yyh, #0
        bne     7f
        cmp     yyl, #0
        bne     7f
        cmp     xxh, #0
        bne     2f
        cmp     xxl, #0
2:
        .ifc    \signed, unsigned
        beq     3f
        mov     xxh, #0
        mvn     xxh, xxh                @ 0xffffffff
        mov     xxl, xxh
3:
        .else
        beq     5f
        blt     6f
        mov     xxl, #0
        mvn     xxl, xxl                @ 0xffffffff
        lsr     xxh, xxl, #1            @ 0x7fffffff
        b       5f
6:      mov     xxh, #0x80
        lsl     xxh, xxh, #24           @ 0x80000000
        mov     xxl, #0
5:
        .endif
        @ tailcalls are tricky on v6-m.
        push    {r0, r1, r2}
        ldr     r0, 1f
        adr     r1, 1f
        add     r0, r1
        str     r0, [sp, #8]
        @ We know we are not on armv4t, so pop pc is safe.
        pop     {r0, r1, pc}
        .align  2
1:
        .word   __aeabi_ldiv0 - 1b
7:
.endm

#ifdef L_aeabi_ldivmod

FUNC_START aeabi_ldivmod
        test_div_by_zero signed

        push {r0, r1}
        mov r0, sp
        push {r0, lr}
        ldr r0, [sp, #8]
        bl SYM(__gnu_ldivmod_helper)
        ldr r3, [sp, #4]
        mov lr, r3
        add sp, sp, #8
        pop {r2, r3}
        RET
        FUNC_END aeabi_ldivmod

#endif /* L_aeabi_ldivmod */

#ifdef L_aeabi_uldivmod

FUNC_START aeabi_uldivmod
        test_div_by_zero unsigned

        push {r0, r1}
        mov r0, sp
        push {r0, lr}
        ldr r0, [sp, #8]
        bl SYM(__gnu_uldivmod_helper)
        ldr r3, [sp, #4]
        mov lr, r3
        add sp, sp, #8
        pop {r2, r3}
        RET
        FUNC_END aeabi_uldivmod
        
#endif /* L_aeabi_uldivmod */

#ifdef L_arm_addsubsf3

FUNC_START aeabi_frsub

      push      {r4, lr}
      mov       r4, #1
      lsl       r4, #31
      eor       r0, r0, r4
      bl        __aeabi_fadd
      pop       {r4, pc}

      FUNC_END aeabi_frsub

#endif /* L_arm_addsubsf3 */

#ifdef L_arm_cmpsf2

FUNC_START aeabi_cfrcmple

        mov     ip, r0
        mov     r0, r1
        mov     r1, ip
        b       6f

FUNC_START aeabi_cfcmpeq
FUNC_ALIAS aeabi_cfcmple aeabi_cfcmpeq

        @ The status-returning routines are required to preserve all
        @ registers except ip, lr, and cpsr.
6:      push    {r0, r1, r2, r3, r4, lr}
        bl      __lesf2
        @ Set the Z flag correctly, and the C flag unconditionally.
        cmp     r0, #0
        @ Clear the C flag if the return value was -1, indicating
        @ that the first operand was smaller than the second.
        bmi 1f
        mov     r1, #0
        cmn     r0, r1
1:
        pop     {r0, r1, r2, r3, r4, pc}

        FUNC_END aeabi_cfcmple
        FUNC_END aeabi_cfcmpeq
        FUNC_END aeabi_cfrcmple

FUNC_START      aeabi_fcmpeq

        push    {r4, lr}
        bl      __eqsf2
        neg     r0, r0
        add     r0, r0, #1
        pop     {r4, pc}

        FUNC_END aeabi_fcmpeq

.macro COMPARISON cond, helper, mode=sf2
FUNC_START      aeabi_fcmp\cond

        push    {r4, lr}
        bl      __\helper\mode
        cmp     r0, #0
        b\cond  1f
        mov     r0, #0
        pop     {r4, pc}
1:
        mov     r0, #1
        pop     {r4, pc}

        FUNC_END aeabi_fcmp\cond
.endm

COMPARISON lt, le
COMPARISON le, le
COMPARISON gt, ge
COMPARISON ge, ge

#endif /* L_arm_cmpsf2 */

#ifdef L_arm_addsubdf3

FUNC_START aeabi_drsub

      push      {r4, lr}
      mov       r4, #1
      lsl       r4, #31
      eor       xxh, xxh, r4
      bl        __aeabi_dadd
      pop       {r4, pc}

      FUNC_END aeabi_drsub

#endif /* L_arm_addsubdf3 */

#ifdef L_arm_cmpdf2

FUNC_START aeabi_cdrcmple

        mov     ip, r0
        mov     r0, r2
        mov     r2, ip
        mov     ip, r1
        mov     r1, r3
        mov     r3, ip
        b       6f

FUNC_START aeabi_cdcmpeq
FUNC_ALIAS aeabi_cdcmple aeabi_cdcmpeq

        @ The status-returning routines are required to preserve all
        @ registers except ip, lr, and cpsr.
6:      push    {r0, r1, r2, r3, r4, lr}
        bl      __ledf2
        @ Set the Z flag correctly, and the C flag unconditionally.
        cmp     r0, #0
        @ Clear the C flag if the return value was -1, indicating
        @ that the first operand was smaller than the second.
        bmi 1f
        mov     r1, #0
        cmn     r0, r1
1:
        pop     {r0, r1, r2, r3, r4, pc}

        FUNC_END aeabi_cdcmple
        FUNC_END aeabi_cdcmpeq
        FUNC_END aeabi_cdrcmple

FUNC_START      aeabi_dcmpeq

        push    {r4, lr}
        bl      __eqdf2
        neg     r0, r0
        add     r0, r0, #1
        pop     {r4, pc}

        FUNC_END aeabi_dcmpeq

.macro COMPARISON cond, helper, mode=df2
FUNC_START      aeabi_dcmp\cond

        push    {r4, lr}
        bl      __\helper\mode
        cmp     r0, #0
        b\cond  1f
        mov     r0, #0
        pop     {r4, pc}
1:
        mov     r0, #1
        pop     {r4, pc}

        FUNC_END aeabi_dcmp\cond
.endm

COMPARISON lt, le
COMPARISON le, le
COMPARISON gt, ge
COMPARISON ge, ge

#endif /* L_arm_cmpdf2 */