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94 lines
2.4 KiB
ArmAsm
94 lines
2.4 KiB
ArmAsm
/* Set current context for ARC.
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Copyright (C) 2020-2025 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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#include "ucontext-macros.h"
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/* int setcontext (const ucontext_t *ucp)
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- Restores the machine context in @ucp and resumes execution
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(doesn't return to caller). */
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ENTRY (__setcontext)
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mov r9, r0 /* Stash @ucp across syscall. */
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8). */
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mov r3, _NSIG8
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mov r2, 0
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add r1, r0, UCONTEXT_SIGMASK
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mov r0, SIG_SETMASK
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mov r8, __NR_rt_sigprocmask
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ARC_TRAP_INSN
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brhi r0, -1024, L (call_syscall_err)
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/* Restore scratch/arg regs for makecontext case. */
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add r9, r9, UCONTEXT_MCONTEXT
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LDR (r0, r9, 22)
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LDR (r1, r9, 21)
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LDR (r2, r9, 20)
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LDR (r3, r9, 19)
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LDR (r4, r9, 18)
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LDR (r5, r9, 17)
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LDR (r6, r9, 16)
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LDR (r7, r9, 15)
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/* Restore callee saved registers. */
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LDR (r13, r9, 37)
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LDR (r14, r9, 36)
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LDR (r15, r9, 35)
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LDR (r16, r9, 34)
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LDR (r17, r9, 33)
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LDR (r18, r9, 32)
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LDR (r19, r9, 31)
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LDR (r20, r9, 30)
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LDR (r21, r9, 29)
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LDR (r22, r9, 28)
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LDR (r23, r9, 27)
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LDR (r24, r9, 26)
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LDR (blink, r9, 7)
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LDR (fp, r9, 8)
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LDR (gp, r9, 9)
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LDR (sp, r9, 23)
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j [blink]
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PSEUDO_END (__setcontext)
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weak_alias (__setcontext, setcontext)
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/* Helper for activating makecontext created context
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- r14 has @func, r15 has uc_link. */
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ENTRY (__startcontext)
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.cfi_label .Ldummy
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cfi_undefined (blink)
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/* Call user @func, loaded in r14 by setcontext. */
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jl [r14]
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/* If uc_link (r15) call setcontext with that. */
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mov r0, r15
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breq r0, 0, 1f
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bl __setcontext
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1:
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/* Exit with status 0. */
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b HIDDEN_JUMPTARGET(exit)
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END (__startcontext)
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