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/* Support functions for the unwinder.
   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.
   Contributed by Paul Brook

   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/>.  */

/* An executable stack is *not* required for these functions.  */
#if defined(__ELF__) && defined(__linux__)
.section .note.GNU-stack,"",%progbits
.previous
#endif

#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__ */

#ifndef __symbian__

#include "lib1funcs.S"

.macro UNPREFIX name
        .global SYM (\name)
        EQUIV SYM (\name), SYM (__\name)
.endm

#if (__ARM_ARCH__ == 4)
/* Some coprocessors require armv5.  We know this code will never be run on
   other cpus.  Tell gas to allow armv5, but only mark the objects as armv4.
 */
.arch armv5t
#ifdef __ARM_ARCH_4T__
.object_arch armv4t
#else
.object_arch armv4
#endif
#endif

#ifdef __ARM_ARCH_6M__

/* r0 points to a 16-word block.  Upload these values to the actual core
   state.  */
FUNC_START restore_core_regs
        mov r1, r0
        add r1, r1, #52
        ldmia r1!, {r3, r4, r5}
        sub r3, r3, #4
        mov ip, r3
        str r5, [r3]
        mov lr, r4
        /* Restore r8-r11.  */
        mov r1, r0
        add r1, r1, #32
        ldmia r1!, {r2, r3, r4, r5}
        mov r8, r2
        mov r9, r3
        mov sl, r4
        mov fp, r5
        mov r1, r0
        add r1, r1, #8
        ldmia r1!, {r2, r3, r4, r5, r6, r7}
        ldr r1, [r0, #4]
        ldr r0, [r0]
        mov sp, ip
        pop {pc}
        FUNC_END restore_core_regs
        UNPREFIX restore_core_regs

/* ARMV6M does not have coprocessors, so these should never be used.  */
FUNC_START gnu_Unwind_Restore_VFP
        RET

/* Store VFR regsters d0-d15 to the address in r0.  */
FUNC_START gnu_Unwind_Save_VFP
        RET

/* Load VFP registers d0-d15 from the address in r0.
   Use this to load from FSTMD format.  */
FUNC_START gnu_Unwind_Restore_VFP_D
        RET

/* Store VFP registers d0-d15 to the address in r0.
   Use this to store in FLDMD format.  */
FUNC_START gnu_Unwind_Save_VFP_D
        RET

/* Load VFP registers d16-d31 from the address in r0.
   Use this to load from FSTMD (=VSTM) format.  Needs VFPv3.  */
FUNC_START gnu_Unwind_Restore_VFP_D_16_to_31
        RET

/* Store VFP registers d16-d31 to the address in r0.
   Use this to store in FLDMD (=VLDM) format.  Needs VFPv3.  */
FUNC_START gnu_Unwind_Save_VFP_D_16_to_31
        RET

FUNC_START gnu_Unwind_Restore_WMMXD
        RET

FUNC_START gnu_Unwind_Save_WMMXD
        RET

FUNC_START gnu_Unwind_Restore_WMMXC
        RET

FUNC_START gnu_Unwind_Save_WMMXC
        RET

.macro  UNWIND_WRAPPER name nargs
        FUNC_START \name
        /* Create a phase2_vrs structure.  */
        /* Save r0 in the PC slot so we can use it as a scratch register.  */
        push {r0}
        add r0, sp, #4
        push {r0, lr} /* Push original SP and LR.  */
        /* Make space for r8-r12.  */
        sub sp, sp, #20
        /* Save low registers.  */
        push {r0, r1, r2, r3, r4, r5, r6, r7}
        /* Save high registers.  */
        add r0, sp, #32
        mov r1, r8
        mov r2, r9
        mov r3, sl
        mov r4, fp
        mov r5, ip
        stmia r0!, {r1, r2, r3, r4, r5}
        /* Restore original low register values.  */
        add r0, sp, #4
        ldmia r0!, {r1, r2, r3, r4, r5}
        /* Restore orginial r0.  */
        ldr r0, [sp, #60]
        str r0, [sp]
        /* Demand-save flags, plus an extra word for alignment.  */
        mov r3, #0
        push {r2, r3}
        /* Point r1 at the block.  Pass r[0..nargs) unchanged.  */
        add r\nargs, sp, #4

        bl SYM (__gnu\name)

        ldr r3, [sp, #64]
        add sp, sp, #72
        bx r3

        FUNC_END \name
        UNPREFIX \name
.endm

#else /* !__ARM_ARCH_6M__ */

/* r0 points to a 16-word block.  Upload these values to the actual core
   state.  */
ARM_FUNC_START restore_core_regs
        /* We must use sp as the base register when restoring sp.  Push the
           last 3 registers onto the top of the current stack to achieve
           this.  */
        add r1, r0, #52
        ldmia r1, {r3, r4, r5}  /* {sp, lr, pc}.  */
#if defined(__thumb2__)
        /* Thumb-2 doesn't allow sp in a load-multiple instruction, so push
           the target address onto the target stack.  This is safe as
           we're always returning to somewhere further up the call stack.  */
        mov ip, r3
        mov lr, r4
        str r5, [ip, #-4]!
#elif defined(__INTERWORKING__)
        /* Restore pc into ip.  */
        mov r2, r5
        stmfd sp!, {r2, r3, r4}
#else
        stmfd sp!, {r3, r4, r5}
#endif
        /* Don't bother restoring ip.  */
        ldmia r0, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp}
#if defined(__thumb2__)
        /* Pop the return address off the target stack.  */
        mov sp, ip
        pop {pc}
#elif defined(__INTERWORKING__)
        /* Pop the three registers we pushed earlier.  */
        ldmfd sp, {ip, sp, lr}
        bx ip
#else
        ldmfd sp, {sp, lr, pc}
#endif
        FUNC_END restore_core_regs
        UNPREFIX restore_core_regs

/* Load VFP registers d0-d15 from the address in r0.
   Use this to load from FSTMX format.  */
ARM_FUNC_START gnu_Unwind_Restore_VFP
        /* Use the generic coprocessor form so that gas doesn't complain
           on soft-float targets.  */
        ldc   p11,cr0,[r0],{0x21} /* fldmiax r0, {d0-d15} */
        RET

/* Store VFP registers d0-d15 to the address in r0.
   Use this to store in FSTMX format.  */
ARM_FUNC_START gnu_Unwind_Save_VFP
        /* Use the generic coprocessor form so that gas doesn't complain
           on soft-float targets.  */
        stc   p11,cr0,[r0],{0x21} /* fstmiax r0, {d0-d15} */
        RET

/* Load VFP registers d0-d15 from the address in r0.
   Use this to load from FSTMD format.  */
ARM_FUNC_START gnu_Unwind_Restore_VFP_D
        ldc   p11,cr0,[r0],{0x20} /* fldmiad r0, {d0-d15} */
        RET

/* Store VFP registers d0-d15 to the address in r0.
   Use this to store in FLDMD format.  */
ARM_FUNC_START gnu_Unwind_Save_VFP_D
        stc   p11,cr0,[r0],{0x20} /* fstmiad r0, {d0-d15} */
        RET

/* Load VFP registers d16-d31 from the address in r0.
   Use this to load from FSTMD (=VSTM) format.  Needs VFPv3.  */
ARM_FUNC_START gnu_Unwind_Restore_VFP_D_16_to_31
        ldcl  p11,cr0,[r0],{0x20} /* vldm r0, {d16-d31} */
        RET

/* Store VFP registers d16-d31 to the address in r0.
   Use this to store in FLDMD (=VLDM) format.  Needs VFPv3.  */
ARM_FUNC_START gnu_Unwind_Save_VFP_D_16_to_31
        stcl  p11,cr0,[r0],{0x20} /* vstm r0, {d16-d31} */
        RET

ARM_FUNC_START gnu_Unwind_Restore_WMMXD
        /* Use the generic coprocessor form so that gas doesn't complain
           on non-iWMMXt targets.  */
        ldcl  p1, cr0, [r0], #8 /* wldrd wr0, [r0], #8 */
        ldcl  p1, cr1, [r0], #8 /* wldrd wr1, [r0], #8 */
        ldcl  p1, cr2, [r0], #8 /* wldrd wr2, [r0], #8 */
        ldcl  p1, cr3, [r0], #8 /* wldrd wr3, [r0], #8 */
        ldcl  p1, cr4, [r0], #8 /* wldrd wr4, [r0], #8 */
        ldcl  p1, cr5, [r0], #8 /* wldrd wr5, [r0], #8 */
        ldcl  p1, cr6, [r0], #8 /* wldrd wr6, [r0], #8 */
        ldcl  p1, cr7, [r0], #8 /* wldrd wr7, [r0], #8 */
        ldcl  p1, cr8, [r0], #8 /* wldrd wr8, [r0], #8 */
        ldcl  p1, cr9, [r0], #8 /* wldrd wr9, [r0], #8 */
        ldcl  p1, cr10, [r0], #8 /* wldrd wr10, [r0], #8 */
        ldcl  p1, cr11, [r0], #8 /* wldrd wr11, [r0], #8 */
        ldcl  p1, cr12, [r0], #8 /* wldrd wr12, [r0], #8 */
        ldcl  p1, cr13, [r0], #8 /* wldrd wr13, [r0], #8 */
        ldcl  p1, cr14, [r0], #8 /* wldrd wr14, [r0], #8 */
        ldcl  p1, cr15, [r0], #8 /* wldrd wr15, [r0], #8 */
        RET

ARM_FUNC_START gnu_Unwind_Save_WMMXD
        /* Use the generic coprocessor form so that gas doesn't complain
           on non-iWMMXt targets.  */
        stcl  p1, cr0, [r0], #8 /* wstrd wr0, [r0], #8 */
        stcl  p1, cr1, [r0], #8 /* wstrd wr1, [r0], #8 */
        stcl  p1, cr2, [r0], #8 /* wstrd wr2, [r0], #8 */
        stcl  p1, cr3, [r0], #8 /* wstrd wr3, [r0], #8 */
        stcl  p1, cr4, [r0], #8 /* wstrd wr4, [r0], #8 */
        stcl  p1, cr5, [r0], #8 /* wstrd wr5, [r0], #8 */
        stcl  p1, cr6, [r0], #8 /* wstrd wr6, [r0], #8 */
        stcl  p1, cr7, [r0], #8 /* wstrd wr7, [r0], #8 */
        stcl  p1, cr8, [r0], #8 /* wstrd wr8, [r0], #8 */
        stcl  p1, cr9, [r0], #8 /* wstrd wr9, [r0], #8 */
        stcl  p1, cr10, [r0], #8 /* wstrd wr10, [r0], #8 */
        stcl  p1, cr11, [r0], #8 /* wstrd wr11, [r0], #8 */
        stcl  p1, cr12, [r0], #8 /* wstrd wr12, [r0], #8 */
        stcl  p1, cr13, [r0], #8 /* wstrd wr13, [r0], #8 */
        stcl  p1, cr14, [r0], #8 /* wstrd wr14, [r0], #8 */
        stcl  p1, cr15, [r0], #8 /* wstrd wr15, [r0], #8 */
        RET

ARM_FUNC_START gnu_Unwind_Restore_WMMXC
        /* Use the generic coprocessor form so that gas doesn't complain
           on non-iWMMXt targets.  */
        ldc2  p1, cr8, [r0], #4 /* wldrw wcgr0, [r0], #4 */
        ldc2  p1, cr9, [r0], #4 /* wldrw wcgr1, [r0], #4 */
        ldc2  p1, cr10, [r0], #4 /* wldrw wcgr2, [r0], #4 */
        ldc2  p1, cr11, [r0], #4 /* wldrw wcgr3, [r0], #4 */
        RET

ARM_FUNC_START gnu_Unwind_Save_WMMXC
        /* Use the generic coprocessor form so that gas doesn't complain
           on non-iWMMXt targets.  */
        stc2  p1, cr8, [r0], #4 /* wstrw wcgr0, [r0], #4 */
        stc2  p1, cr9, [r0], #4 /* wstrw wcgr1, [r0], #4 */
        stc2  p1, cr10, [r0], #4 /* wstrw wcgr2, [r0], #4 */
        stc2  p1, cr11, [r0], #4 /* wstrw wcgr3, [r0], #4 */
        RET

/* Wrappers to save core registers, then call the real routine.   */

.macro  UNWIND_WRAPPER name nargs
        ARM_FUNC_START \name
        /* Create a phase2_vrs structure.  */
        /* Split reg push in two to ensure the correct value for sp.  */
#if defined(__thumb2__)
        mov ip, sp
        push {lr} /* PC is ignored.  */
        push {ip, lr} /* Push original SP and LR.  */
#else
        stmfd sp!, {sp, lr, pc}
#endif
        stmfd sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip}
        
        /* Demand-save flags, plus an extra word for alignment.  */
        mov r3, #0
        stmfd sp!, {r2, r3}

        /* Point r1 at the block.  Pass r[0..nargs) unchanged.  */
        add r\nargs, sp, #4
#if defined(__thumb__) && !defined(__thumb2__)
        /* Switch back to thumb mode to avoid interworking hassle.  */
        adr ip, .L1_\name
        orr ip, ip, #1
        bx ip
        .thumb
.L1_\name:
        bl SYM (__gnu\name) __PLT__
        ldr r3, [sp, #64]
        add sp, #72
        bx r3
#else
        bl SYM (__gnu\name) __PLT__
        ldr lr, [sp, #64]
        add sp, sp, #72
        RET
#endif
        FUNC_END \name
        UNPREFIX \name
.endm

#endif /* !__ARM_ARCH_6M__ */

UNWIND_WRAPPER _Unwind_RaiseException 1
UNWIND_WRAPPER _Unwind_Resume 1
UNWIND_WRAPPER _Unwind_Resume_or_Rethrow 1
UNWIND_WRAPPER _Unwind_ForcedUnwind 3
UNWIND_WRAPPER _Unwind_Backtrace 2

#endif  /* ndef __symbian__ */