diff options
Diffstat (limited to 'newlib/libc/machine/nds32/setjmp.S')
-rw-r--r-- | newlib/libc/machine/nds32/setjmp.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/newlib/libc/machine/nds32/setjmp.S b/newlib/libc/machine/nds32/setjmp.S new file mode 100644 index 000000000..90b162ef8 --- /dev/null +++ b/newlib/libc/machine/nds32/setjmp.S @@ -0,0 +1,87 @@ +/* +Copyright (c) 2013 Andes Technology Corporation. +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + The name of the company may not be used to endorse or promote + products derived from this software without specific prior written + permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +The setjmp/longjmp for nds32. +The usage of thirty-two 32-bit General Purpose Registers (GPR): + $r28 : $fp + $r29 : $gp + $r30 : $lp + $r31 : $sp + + caller-save registers: $r0 ~ $r5, $r16 ~ $r23 + callee-save registers: $r6 ~ $r10, $r11 ~ $r14 + reserved for assembler : $r15 + reserved for other use : $r24, $r25, $r26, $r27 + +Save all callee-save registers and $fp, $gp, $lp and $sp. +*/ + +/* int setjmp(jmp_buf env); */ + .text + .align 2 + .global setjmp + .type setjmp, @function +setjmp: +#ifdef __NDS32_REDUCED_REGS__ + /* This case, save 10 words. */ + smw.bim $r6, [$r0], $r10, 0x0 + smw.bim $r31, [$r0], $r31, 0xf +#else + /* This case, save 17 words. */ + smw.bim $r6, [$r0], $r14, 0x0 + smw.bim $r16, [$r0], $r19, 0xf +#endif + + /* Set return value to zero. */ + movi $r0, 0 + ret + .size setjmp, .-setjmp + + +/* void longjmp(jmp_buf env, int val); */ + .text + .align 2 + .global longjmp + .type longjmp, @function +longjmp: +#ifdef __NDS32_REDUCED_REGS__ + lmw.bim $r6, [$r0], $r10, 0x0 + lmw.bim $r31, [$r0], $r31, 0xf +#else + lmw.bim $r6, [$r0], $r14, 0x0 + lmw.bim $r16, [$r0], $r19, 0xf +#endif + /* If the value val is 0, 1 will be returned instead. */ + bnez $r1, 1f + movi $r1, 1 +1: + move $r0, $r1 + ret + .size longjmp, .-longjmp |