363 lines
11 KiB
ArmAsm
363 lines
11 KiB
ArmAsm
/* Support functions for the unwinder.
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Copyright (C) 2003-2021 Free Software Foundation, Inc.
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Contributed by Paul Brook
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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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/* An executable stack is *not* required for these functions. */
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#if defined(__ELF__) && defined(__linux__)
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.section .note.GNU-stack,"",%progbits
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.previous
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#endif
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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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#ifndef __symbian__
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#include "lib1funcs.S"
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.macro UNPREFIX name
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.global SYM (\name)
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EQUIV SYM (\name), SYM (__\name)
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.endm
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#if (__ARM_ARCH == 4)
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/* Some coprocessors require armv5t. We know this code will never be run on
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other cpus. Tell gas to allow armv5t, but only mark the objects as armv4.
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*/
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.arch armv5t
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#ifdef __ARM_ARCH_4T__
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.object_arch armv4t
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#else
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.object_arch armv4
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#endif
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#endif
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#if !__ARM_ARCH_ISA_ARM && __ARM_ARCH_ISA_THUMB == 1
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/* r0 points to a 16-word block. Upload these values to the actual core
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state. */
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FUNC_START restore_core_regs
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movs r1, r0
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adds r1, r1, #52
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ldmia r1!, {r3, r4, r5}
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subs r3, r3, #4
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mov ip, r3
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str r5, [r3]
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mov lr, r4
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/* Restore r8-r11. */
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movs r1, r0
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adds r1, r1, #32
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ldmia r1!, {r2, r3, r4, r5}
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mov r8, r2
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mov r9, r3
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mov sl, r4
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mov fp, r5
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movs r1, r0
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adds r1, r1, #8
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ldmia r1!, {r2, r3, r4, r5, r6, r7}
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ldr r1, [r0, #4]
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ldr r0, [r0]
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mov sp, ip
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pop {pc}
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FUNC_END restore_core_regs
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UNPREFIX restore_core_regs
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/* ARMV6M does not have coprocessors, so these should never be used. */
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FUNC_START gnu_Unwind_Restore_VFP
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RET
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/* Store VFR regsters d0-d15 to the address in r0. */
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FUNC_START gnu_Unwind_Save_VFP
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RET
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/* Load VFP registers d0-d15 from the address in r0.
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Use this to load from FSTMD format. */
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FUNC_START gnu_Unwind_Restore_VFP_D
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RET
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/* Store VFP registers d0-d15 to the address in r0.
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Use this to store in FLDMD format. */
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FUNC_START gnu_Unwind_Save_VFP_D
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RET
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/* Load VFP registers d16-d31 from the address in r0.
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Use this to load from FSTMD (=VSTM) format. Needs VFPv3. */
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FUNC_START gnu_Unwind_Restore_VFP_D_16_to_31
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RET
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/* Store VFP registers d16-d31 to the address in r0.
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Use this to store in FLDMD (=VLDM) format. Needs VFPv3. */
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FUNC_START gnu_Unwind_Save_VFP_D_16_to_31
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RET
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FUNC_START gnu_Unwind_Restore_WMMXD
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RET
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FUNC_START gnu_Unwind_Save_WMMXD
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RET
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FUNC_START gnu_Unwind_Restore_WMMXC
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RET
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FUNC_START gnu_Unwind_Save_WMMXC
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RET
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.macro UNWIND_WRAPPER name nargs
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FUNC_START \name
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/* Create a phase2_vrs structure. */
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/* Save r0 in the PC slot so we can use it as a scratch register. */
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push {r0}
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add r0, sp, #4
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push {r0, lr} /* Push original SP and LR. */
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/* Make space for r8-r12. */
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sub sp, sp, #20
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/* Save low registers. */
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push {r0, r1, r2, r3, r4, r5, r6, r7}
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/* Save high registers. */
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add r0, sp, #32
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mov r1, r8
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mov r2, r9
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mov r3, sl
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mov r4, fp
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mov r5, ip
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stmia r0!, {r1, r2, r3, r4, r5}
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/* Restore original low register values. */
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add r0, sp, #4
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ldmia r0!, {r1, r2, r3, r4, r5}
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/* Restore orginial r0. */
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ldr r0, [sp, #60]
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str r0, [sp]
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/* Demand-save flags, plus an extra word for alignment. */
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movs r3, #0
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push {r2, r3}
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/* Point r1 at the block. Pass r[0..nargs) unchanged. */
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add r\nargs, sp, #4
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bl SYM (__gnu\name)
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ldr r3, [sp, #64]
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add sp, sp, #72
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bx r3
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FUNC_END \name
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UNPREFIX \name
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.endm
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#else /* __ARM_ARCH_ISA_ARM || __ARM_ARCH_ISA_THUMB != 1 */
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/* r0 points to a 16-word block. Upload these values to the actual core
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state. */
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ARM_FUNC_START restore_core_regs
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/* We must use sp as the base register when restoring sp. Push the
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last 3 registers onto the top of the current stack to achieve
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this. */
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add r1, r0, #52
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ldmia r1, {r3, r4, r5} /* {sp, lr, pc}. */
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#if defined(__thumb2__)
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/* Thumb-2 doesn't allow sp in a load-multiple instruction, so push
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the target address onto the target stack. This is safe as
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we're always returning to somewhere further up the call stack. */
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mov ip, r3
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mov lr, r4
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str r5, [ip, #-4]!
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#elif defined(__INTERWORKING__)
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/* Restore pc into ip. */
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mov r2, r5
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stmfd sp!, {r2, r3, r4}
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#else
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stmfd sp!, {r3, r4, r5}
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#endif
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/* Don't bother restoring ip. */
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ldmia r0, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp}
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#if defined(__thumb2__)
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/* Pop the return address off the target stack. */
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mov sp, ip
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pop {pc}
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#elif defined(__INTERWORKING__)
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/* Pop the three registers we pushed earlier. */
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ldmfd sp, {ip, sp, lr}
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bx ip
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#else
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ldmfd sp, {sp, lr, pc}
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#endif
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FUNC_END restore_core_regs
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UNPREFIX restore_core_regs
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/* Load VFP registers d0-d15 from the address in r0.
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Use this to load from FSTMX format. */
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ARM_FUNC_START gnu_Unwind_Restore_VFP
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/* Use the generic coprocessor form so that gas doesn't complain
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on soft-float targets. */
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ldc p11,cr0,[r0],{0x21} /* fldmiax r0, {d0-d15} */
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RET
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/* Store VFP registers d0-d15 to the address in r0.
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Use this to store in FSTMX format. */
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ARM_FUNC_START gnu_Unwind_Save_VFP
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/* Use the generic coprocessor form so that gas doesn't complain
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on soft-float targets. */
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stc p11,cr0,[r0],{0x21} /* fstmiax r0, {d0-d15} */
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RET
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/* Load VFP registers d0-d15 from the address in r0.
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Use this to load from FSTMD format. */
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ARM_FUNC_START gnu_Unwind_Restore_VFP_D
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ldc p11,cr0,[r0],{0x20} /* fldmiad r0, {d0-d15} */
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RET
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/* Store VFP registers d0-d15 to the address in r0.
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Use this to store in FLDMD format. */
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ARM_FUNC_START gnu_Unwind_Save_VFP_D
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stc p11,cr0,[r0],{0x20} /* fstmiad r0, {d0-d15} */
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RET
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/* Load VFP registers d16-d31 from the address in r0.
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Use this to load from FSTMD (=VSTM) format. Needs VFPv3. */
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ARM_FUNC_START gnu_Unwind_Restore_VFP_D_16_to_31
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ldcl p11,cr0,[r0],{0x20} /* vldm r0, {d16-d31} */
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RET
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/* Store VFP registers d16-d31 to the address in r0.
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Use this to store in FLDMD (=VLDM) format. Needs VFPv3. */
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ARM_FUNC_START gnu_Unwind_Save_VFP_D_16_to_31
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stcl p11,cr0,[r0],{0x20} /* vstm r0, {d16-d31} */
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RET
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ARM_FUNC_START gnu_Unwind_Restore_WMMXD
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/* Use the generic coprocessor form so that gas doesn't complain
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on non-iWMMXt targets. */
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ldcl p1, cr0, [r0], #8 /* wldrd wr0, [r0], #8 */
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ldcl p1, cr1, [r0], #8 /* wldrd wr1, [r0], #8 */
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ldcl p1, cr2, [r0], #8 /* wldrd wr2, [r0], #8 */
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ldcl p1, cr3, [r0], #8 /* wldrd wr3, [r0], #8 */
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ldcl p1, cr4, [r0], #8 /* wldrd wr4, [r0], #8 */
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ldcl p1, cr5, [r0], #8 /* wldrd wr5, [r0], #8 */
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ldcl p1, cr6, [r0], #8 /* wldrd wr6, [r0], #8 */
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ldcl p1, cr7, [r0], #8 /* wldrd wr7, [r0], #8 */
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ldcl p1, cr8, [r0], #8 /* wldrd wr8, [r0], #8 */
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ldcl p1, cr9, [r0], #8 /* wldrd wr9, [r0], #8 */
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ldcl p1, cr10, [r0], #8 /* wldrd wr10, [r0], #8 */
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ldcl p1, cr11, [r0], #8 /* wldrd wr11, [r0], #8 */
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ldcl p1, cr12, [r0], #8 /* wldrd wr12, [r0], #8 */
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ldcl p1, cr13, [r0], #8 /* wldrd wr13, [r0], #8 */
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ldcl p1, cr14, [r0], #8 /* wldrd wr14, [r0], #8 */
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ldcl p1, cr15, [r0], #8 /* wldrd wr15, [r0], #8 */
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RET
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ARM_FUNC_START gnu_Unwind_Save_WMMXD
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/* Use the generic coprocessor form so that gas doesn't complain
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on non-iWMMXt targets. */
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stcl p1, cr0, [r0], #8 /* wstrd wr0, [r0], #8 */
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stcl p1, cr1, [r0], #8 /* wstrd wr1, [r0], #8 */
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stcl p1, cr2, [r0], #8 /* wstrd wr2, [r0], #8 */
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stcl p1, cr3, [r0], #8 /* wstrd wr3, [r0], #8 */
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stcl p1, cr4, [r0], #8 /* wstrd wr4, [r0], #8 */
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stcl p1, cr5, [r0], #8 /* wstrd wr5, [r0], #8 */
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stcl p1, cr6, [r0], #8 /* wstrd wr6, [r0], #8 */
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stcl p1, cr7, [r0], #8 /* wstrd wr7, [r0], #8 */
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stcl p1, cr8, [r0], #8 /* wstrd wr8, [r0], #8 */
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stcl p1, cr9, [r0], #8 /* wstrd wr9, [r0], #8 */
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stcl p1, cr10, [r0], #8 /* wstrd wr10, [r0], #8 */
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stcl p1, cr11, [r0], #8 /* wstrd wr11, [r0], #8 */
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stcl p1, cr12, [r0], #8 /* wstrd wr12, [r0], #8 */
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stcl p1, cr13, [r0], #8 /* wstrd wr13, [r0], #8 */
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stcl p1, cr14, [r0], #8 /* wstrd wr14, [r0], #8 */
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stcl p1, cr15, [r0], #8 /* wstrd wr15, [r0], #8 */
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RET
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ARM_FUNC_START gnu_Unwind_Restore_WMMXC
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/* Use the generic coprocessor form so that gas doesn't complain
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on non-iWMMXt targets. */
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ldc2 p1, cr8, [r0], #4 /* wldrw wcgr0, [r0], #4 */
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ldc2 p1, cr9, [r0], #4 /* wldrw wcgr1, [r0], #4 */
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ldc2 p1, cr10, [r0], #4 /* wldrw wcgr2, [r0], #4 */
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ldc2 p1, cr11, [r0], #4 /* wldrw wcgr3, [r0], #4 */
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RET
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ARM_FUNC_START gnu_Unwind_Save_WMMXC
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/* Use the generic coprocessor form so that gas doesn't complain
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on non-iWMMXt targets. */
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stc2 p1, cr8, [r0], #4 /* wstrw wcgr0, [r0], #4 */
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stc2 p1, cr9, [r0], #4 /* wstrw wcgr1, [r0], #4 */
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stc2 p1, cr10, [r0], #4 /* wstrw wcgr2, [r0], #4 */
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stc2 p1, cr11, [r0], #4 /* wstrw wcgr3, [r0], #4 */
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RET
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/* Wrappers to save core registers, then call the real routine. */
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.macro UNWIND_WRAPPER name nargs
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ARM_FUNC_START \name
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/* Create a phase2_vrs structure. */
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/* Split reg push in two to ensure the correct value for sp. */
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#if defined(__thumb2__)
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mov ip, sp
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push {lr} /* PC is ignored. */
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push {ip, lr} /* Push original SP and LR. */
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#else
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stmfd sp!, {sp, lr, pc}
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#endif
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stmfd sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip}
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/* Demand-save flags, plus an extra word for alignment. */
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mov r3, #0
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stmfd sp!, {r2, r3}
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/* Point r1 at the block. Pass r[0..nargs) unchanged. */
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add r\nargs, sp, #4
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#if defined(__thumb__) && !defined(__thumb2__)
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/* Switch back to thumb mode to avoid interworking hassle. */
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adr ip, .L1_\name
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orr ip, ip, #1
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bx ip
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.thumb
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.L1_\name:
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bl SYM (__gnu\name) __PLT__
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ldr r3, [sp, #64]
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add sp, #72
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bx r3
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#else
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bl SYM (__gnu\name) __PLT__
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ldr lr, [sp, #64]
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add sp, sp, #72
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RET
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#endif
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FUNC_END \name
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UNPREFIX \name
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.endm
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#endif /* __ARM_ARCH_ISA_ARM || __ARM_ARCH_ISA_THUMB != 1 */
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UNWIND_WRAPPER _Unwind_RaiseException 1
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UNWIND_WRAPPER _Unwind_Resume 1
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UNWIND_WRAPPER _Unwind_Resume_or_Rethrow 1
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UNWIND_WRAPPER _Unwind_ForcedUnwind 3
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UNWIND_WRAPPER _Unwind_Backtrace 2
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#endif /* ndef __symbian__ */
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