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739e89cbe6
Update the offsets used to save registers into the stejmp jmp_buf structure in order to: * Avoid writing the supervision register outside the buffer and thus clobbering something on the stack. Previously the supervision register was written at offset 124 while the buffer was of length 124. * Shrink the jmp_buf down to the size actually needed, by avoiding holes at the locations of omitted registers.
109 lines
2.9 KiB
ArmAsm
109 lines
2.9 KiB
ArmAsm
/*
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Copyright (c) 2014, Hesham ALMatary
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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.align 4
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.global setjmp
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.type setjmp,@function
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setjmp:
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l.sw 0(r3), r1
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l.sw 4(r3), r2
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/* Skip r3-r8 as they are not preserved across function calls */
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l.sw 8(r3), r9
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/* Skip r10 as it's preserved to be used by TLS */
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/* Skip r11, setjmp always set it to 0 */
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/* The following set if registers are preserved across function calls */
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l.sw 12(r3), r14
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l.sw 16(r3), r16
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l.sw 20(r3), r18
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l.sw 24(r3), r20
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l.sw 28(r3), r22
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l.sw 32(r3), r24
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l.sw 36(r3), r26
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l.sw 40(r3), r28
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l.sw 44(r3), r30
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/* Save Status Register */
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l.mfspr r13, r0, 17
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l.sw 48(r3), r13
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/* Set result register to 0 and jump */
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// Different cases for optional delay slot
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#if defined(__OR1K_NODELAY__)
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l.addi r11, r0, 0
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l.jr r9
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#elif defined(__OR1K_DELAY__)
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l.jr r9
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l.addi r11, r0, 0
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#else
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l.addi r11, r0, 0
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l.jr r9
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l.nop
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#endif
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.align 4
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.global longjmp
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.type longjmp,@function
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longjmp:
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/* If the second argument to longjmp is zero, set return address to 1,
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otherwise set it to the value of the second argument */
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l.addi r11, r0, 1
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l.sfeq r4, r0
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l.bf 1f
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l.nop
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l.addi r11, r4, 0
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/* Load status register */
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1:
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l.lwz r15, 48(r3)
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l.mtspr r0, r15, 17
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l.lwz r1, 0(r3)
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l.lwz r2, 4(r3)
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/* Skip r3-r8 as they are not preserved across function calls */
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l.lwz r9, 8(r3)
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/* Skip r11 as it's always set by longjmp */
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l.lwz r14, 12(r3)
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l.lwz r16, 16(r3)
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l.lwz r18, 20(r3)
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l.lwz r20, 24(r3)
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l.lwz r22, 28(r3)
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l.lwz r24, 32(r3)
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l.lwz r26, 36(r3)
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l.lwz r28, 40(r3)
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// Different cases for optional delay slot
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#if defined(__OR1K_NODELAY__)
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l.lwz r30, 44(r3)
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l.jr r9
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#elif defined(__OR1K_DELAY__)
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l.jr r9
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l.lwz r30, 44(r3)
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#else
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l.lwz r30, 44(r3)
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l.jr r9
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l.nop
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#endif
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