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- /*
- * Copyright (C) 2016 Andes Technology, Inc.
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
- /*
- setjmp/longjmp for nds32.
- r0 - r5 are for paramter passing - no need to save
- r6 - r14 are callee saved - needs to save
- r15 is temp register for assembler - no need to save
- r16 - r25 are caller saved - no need to save
- r26 - r27 are temp registers for OS - no need to save
- r28 is fp - need to save
- r29 is gp - need to save
- r30 is ra - need to save
- r31 is sp - need to save
- so we need to save r6 - r14 and r28 - r31
- The jmpbuf looks like this:
- r6
- r7
- r8
- r9
- r10
- r11
- r12
- r13
- r14
- fp
- gp
- ra
- sp
- #ifdef NDS32_ABI_2FP_PLUS
- ($fpcfg.freg)
- (callee-saved FPU regs)
- #endif
- reserved(for 8-byte align if needed)
- */
- #include <sysdep.h>
- #define _SETJMP_H
- #define _ASM
- #include <bits/setjmp.h>
- .section .text
- ENTRY(__sigsetjmp)
- move $r2, $r0
- .off_16bit
- ! save registers into buffer
- smw.bim $r6, [$r2], $r14, #0xf
- .restore_16bit
- #ifdef NDS32_ABI_2FP_PLUS
- /* Process for FPU registers. */
- fmfcfg $r20 /* Keep $fpcfg in $r20. */
- slli $r20, $r20, #28
- srli $r20, $r20, #30 /* Set $r20 as $fpcfg.freg. */
- swi.bi $r20, [$r2], #4
- /* Case switch for $r20 as $fpcfg.freg. */
- beqz $r20, .LCFG0 /* Branch if $fpcfg.freg = 0b00. */
- xori $r15, $r20, #0b10
- beqz $r15, .LCFG2 /* Branch if $fpcfg.freg = 0b10. */
- srli $r20, $r20, #0b01
- beqz $r20, .LCFG1 /* Branch if $fpcfg.freg = 0b01. */
- /* Fall-through if $fpcfg.freg = 0b11. */
- .LCFG3:
- fsdi.bi $fd31, [$r2], #8
- fsdi.bi $fd30, [$r2], #8
- fsdi.bi $fd29, [$r2], #8
- fsdi.bi $fd28, [$r2], #8
- fsdi.bi $fd27, [$r2], #8
- fsdi.bi $fd26, [$r2], #8
- fsdi.bi $fd25, [$r2], #8
- fsdi.bi $fd24, [$r2], #8
- .LCFG2:
- fsdi.bi $fd10, [$r2], #8
- fsdi.bi $fd9, [$r2], #8
- fsdi.bi $fd8, [$r2], #8
- .LCFG1:
- fsdi.bi $fd7, [$r2], #8
- fsdi.bi $fd6, [$r2], #8
- fsdi.bi $fd5, [$r2], #8
- fsdi.bi $fd4, [$r2], #8
- .LCFG0:
- fsdi.bi $fd3, [$r2], #8
- #endif /* NDS32_ABI_2FP_PLUS */
- /* Make a tail call to __sigjmp_save. */
- #ifdef PIC
- /* Initialize $r2 as $gp value. */
- sethi $r2, hi20(_GLOBAL_OFFSET_TABLE_-8)
- ori $r2, $r2, lo12(_GLOBAL_OFFSET_TABLE_-4)
- mfusr $r15, $pc
- add $r2, $r15, $r2
- ! la $r3, __sigjmp_save@PLT
- sethi $r3, hi20(__sigjmp_save@PLT)
- ori $r3, $r3, lo12(__sigjmp_save@PLT)
- add $r3, $r3, $r2
- jr $r3
- #else /* NOT PIC */
- la $r15, C_SYMBOL_NAME(__sigjmp_save)
- jr $r15
- #endif
- END(__sigsetjmp)
- libc_hidden_def(__sigsetjmp)
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