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89 lines
2.8 KiB
ArmAsm
89 lines
2.8 KiB
ArmAsm
/* Save current context. OpenRISC common version.
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Copyright (C) 2024-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This common getcontext template helps define different
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implementations using control macros. Before including
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this file in another file define the following:
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__CONTEXT_FUNC_NAME
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__CONTEXT_ENABLE_FPCSR
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__CONTEXT_SIGMASK_OFFSET
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*/
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/* int getcontext (ucontext_t *ucp)
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Returns 0 on success -1 and errno on failure.
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*/
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.text
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ENTRY(__CONTEXT_FUNC_NAME)
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/* Store r1, the stack pointer. */
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l.sw (UCONTEXT_MCONTEXT + 1*4)(r3), r1
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/* Store r2, the frame pointer. */
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l.sw (UCONTEXT_MCONTEXT + 2*4)(r3), r2
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/* Store r9, the link register. */
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l.sw (UCONTEXT_MCONTEXT + 9*4)(r3), r9
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/* Store r9 to reg[11] too, as we need two links for makecontext. */
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l.sw (UCONTEXT_MCONTEXT + 11*4)(r3), r9
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/* Store r10, the TLS register. */
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l.sw (UCONTEXT_MCONTEXT + 10*4)(r3), r10
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/* Store r14-r30 even, callee saved registers. */
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l.sw (UCONTEXT_MCONTEXT + 14*4)(r3), r14
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l.sw (UCONTEXT_MCONTEXT + 16*4)(r3), r16
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l.sw (UCONTEXT_MCONTEXT + 18*4)(r3), r18
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l.sw (UCONTEXT_MCONTEXT + 20*4)(r3), r20
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l.sw (UCONTEXT_MCONTEXT + 22*4)(r3), r22
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l.sw (UCONTEXT_MCONTEXT + 24*4)(r3), r24
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l.sw (UCONTEXT_MCONTEXT + 26*4)(r3), r26
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l.sw (UCONTEXT_MCONTEXT + 28*4)(r3), r28
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l.sw (UCONTEXT_MCONTEXT + 30*4)(r3), r30
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#ifdef __CONTEXT_ENABLE_FPCSR
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# ifdef __or1k_hard_float__
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/* Store the floating point state. */
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l.mfspr r4, r0, 20
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l.sw (MCONTEXT_FPCSR)(r3), r4
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# else
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/* Store zero to indicate default rounding as per softfloat. */
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l.sw (MCONTEXT_FPCSR)(r3), r0
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# endif /* __or1k_hard_float__ */
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#endif /* __CONTEXT_ENABLE_FPCSR */
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/* Get signal mask. */
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/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
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l.ori r6, r0, _NSIG8
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l.addi r5, r3, __CONTEXT_SIGMASK_OFFSET
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l.ori r4, r0, 0
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l.ori r3, r0, SIG_BLOCK
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l.ori r11, r0, SYS_ify (rt_sigprocmask)
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/* Do the syscall. */
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l.sys 1
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l.nop
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/* if -4096 < ret < 0 holds, it's an error */
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l.sfgeui r11, 0xf001
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l.bf 1f
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l.nop
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l.jr r9
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l.ori r11, r0, 0
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1: l.j __syscall_error
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l.ori r3, r11, 0
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END(__CONTEXT_FUNC_NAME)
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