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libruntime: Add fiber context switch code for LoongArch.
libphobos/ChangeLog: * libdruntime/config/loongarch/switchcontext.S: New file.
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/* LoongArch support code for fibers and multithreading. | ||
Copyright (C) 2023 Free Software Foundation, Inc. | ||
This file is part of GCC. | ||
GCC 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. | ||
GCC 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/>. */ | ||
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#include "../common/threadasm.S" | ||
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/** | ||
* Performs a context switch. | ||
* | ||
* $a0 - void** - ptr to old stack pointer | ||
* $a1 - void* - new stack pointer | ||
* | ||
*/ | ||
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#if defined(__loongarch_lp64) | ||
# define GPR_L ld.d | ||
# define GPR_S st.d | ||
# define SZ_GPR 8 | ||
# define ADDSP(si) addi.d $sp, $sp, si | ||
#elif defined(__loongarch64_ilp32) | ||
# define GPR_L ld.w | ||
# define GPR_S st.w | ||
# define SZ_GPR 4 | ||
# define ADDSP(si) addi.w $sp, $sp, si | ||
#else | ||
# error Unsupported GPR size (must be 64-bit or 32-bit). | ||
#endif | ||
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#if defined(__loongarch_double_float) | ||
# define FPR_L fld.d | ||
# define FPR_S fst.d | ||
# define SZ_FPR 8 | ||
#elif defined(__loongarch_single_float) | ||
# define FPR_L fld.s | ||
# define FPR_S fst.s | ||
# define SZ_FPR 4 | ||
#else | ||
# define SZ_FPR 0 | ||
#endif | ||
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.text | ||
.align 2 | ||
.global fiber_switchContext | ||
.type fiber_switchContext, @function | ||
fiber_switchContext: | ||
.cfi_startproc | ||
ADDSP(-11 * SZ_GPR) | ||
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// fp regs and return address are stored below the stack | ||
// because we don't want the GC to scan them. | ||
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// return address (r1) | ||
GPR_S $r1, $sp, -SZ_GPR | ||
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#if SZ_FPR != 0 | ||
// callee-saved scratch FPRs (f24-f31) | ||
FPR_S $f24, $sp, -SZ_GPR-1*SZ_FPR | ||
FPR_S $f25, $sp, -SZ_GPR-2*SZ_FPR | ||
FPR_S $f26, $sp, -SZ_GPR-3*SZ_FPR | ||
FPR_S $f27, $sp, -SZ_GPR-4*SZ_FPR | ||
FPR_S $f28, $sp, -SZ_GPR-5*SZ_FPR | ||
FPR_S $f29, $sp, -SZ_GPR-6*SZ_FPR | ||
FPR_S $f30, $sp, -SZ_GPR-7*SZ_FPR | ||
FPR_S $f31, $sp, -SZ_GPR-8*SZ_FPR | ||
#endif | ||
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// callee-saved GPRs (r21, fp (r22), r23-r31) | ||
GPR_S $r21, $sp, 0*SZ_GPR | ||
GPR_S $fp, $sp, 1*SZ_GPR | ||
GPR_S $s0, $sp, 2*SZ_GPR | ||
GPR_S $s1, $sp, 3*SZ_GPR | ||
GPR_S $s2, $sp, 4*SZ_GPR | ||
GPR_S $s3, $sp, 5*SZ_GPR | ||
GPR_S $s4, $sp, 6*SZ_GPR | ||
GPR_S $s5, $sp, 7*SZ_GPR | ||
GPR_S $s6, $sp, 8*SZ_GPR | ||
GPR_S $s7, $sp, 9*SZ_GPR | ||
GPR_S $s8, $sp, 10*SZ_GPR | ||
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// swap stack pointer | ||
GPR_S $sp, $a0, 0 | ||
move $sp, $a1 | ||
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GPR_L $r1, $sp, -SZ_GPR | ||
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#if SZ_FPR != 0 | ||
FPR_L $f24, $sp, -SZ_GPR-1*SZ_FPR | ||
FPR_L $f25, $sp, -SZ_GPR-2*SZ_FPR | ||
FPR_L $f26, $sp, -SZ_GPR-3*SZ_FPR | ||
FPR_L $f27, $sp, -SZ_GPR-4*SZ_FPR | ||
FPR_L $f28, $sp, -SZ_GPR-5*SZ_FPR | ||
FPR_L $f29, $sp, -SZ_GPR-6*SZ_FPR | ||
FPR_L $f30, $sp, -SZ_GPR-7*SZ_FPR | ||
FPR_L $f31, $sp, -SZ_GPR-8*SZ_FPR | ||
#endif | ||
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GPR_L $r21, $sp, 0*SZ_GPR | ||
GPR_L $fp, $sp, 1*SZ_GPR | ||
GPR_L $s0, $sp, 2*SZ_GPR | ||
GPR_L $s1, $sp, 3*SZ_GPR | ||
GPR_L $s2, $sp, 4*SZ_GPR | ||
GPR_L $s3, $sp, 5*SZ_GPR | ||
GPR_L $s4, $sp, 6*SZ_GPR | ||
GPR_L $s5, $sp, 7*SZ_GPR | ||
GPR_L $s6, $sp, 8*SZ_GPR | ||
GPR_L $s7, $sp, 9*SZ_GPR | ||
GPR_L $s8, $sp, 10*SZ_GPR | ||
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ADDSP(11 * SZ_GPR) | ||
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jr $r1 // return | ||
.cfi_endproc | ||
.size fiber_switchContext,.-fiber_switchContext |