mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-27 12:15:39 +03:00
140 lines
4.5 KiB
ArmAsm
140 lines
4.5 KiB
ArmAsm
/* Swap two contexts. OpenRISC version.
|
|
Copyright (C) 2022-2025 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* This common swapcontext template helps define different
|
|
implementations using control macros. Before including this file
|
|
in another file define the following:
|
|
|
|
__CONTEXT_FUNC_NAME
|
|
__CONTEXT_ENABLE_FPCSR
|
|
__CONTEXT_SIGMASK_OFFSET
|
|
*/
|
|
|
|
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
|
|
.text
|
|
ENTRY(__CONTEXT_FUNC_NAME)
|
|
|
|
/* Same as getcontext. */
|
|
/* Store r1, the stack pointer. */
|
|
l.sw (UCONTEXT_MCONTEXT + 1*4)(r3), r1
|
|
/* Store r2, the frame pointer. */
|
|
l.sw (UCONTEXT_MCONTEXT + 2*4)(r3), r2
|
|
/* Store r9, the link register. */
|
|
l.sw (UCONTEXT_MCONTEXT + 9*4)(r3), r9
|
|
/* Store r9 to reg[11] too, as we need two links for makecontext. */
|
|
l.sw (UCONTEXT_MCONTEXT + 11*4)(r3), r9
|
|
/* Store r10, the TLS register. */
|
|
l.sw (UCONTEXT_MCONTEXT + 10*4)(r3), r10
|
|
/* Store r14-r30 even, callee saved registers. */
|
|
l.sw (UCONTEXT_MCONTEXT + 14*4)(r3), r14
|
|
l.sw (UCONTEXT_MCONTEXT + 16*4)(r3), r16
|
|
l.sw (UCONTEXT_MCONTEXT + 18*4)(r3), r18
|
|
l.sw (UCONTEXT_MCONTEXT + 20*4)(r3), r20
|
|
l.sw (UCONTEXT_MCONTEXT + 22*4)(r3), r22
|
|
l.sw (UCONTEXT_MCONTEXT + 24*4)(r3), r24
|
|
l.sw (UCONTEXT_MCONTEXT + 26*4)(r3), r26
|
|
l.sw (UCONTEXT_MCONTEXT + 28*4)(r3), r28
|
|
l.sw (UCONTEXT_MCONTEXT + 30*4)(r3), r30
|
|
|
|
#ifdef __CONTEXT_ENABLE_FPCSR
|
|
# ifdef __or1k_hard_float__
|
|
/* Store the floating point state. */
|
|
l.mfspr r6, r0, 20
|
|
l.sw (MCONTEXT_FPCSR)(r3), r6
|
|
# else
|
|
/* Store zero to indicate default rounding as per softfloat. */
|
|
l.sw (MCONTEXT_FPCSR)(r3), r0
|
|
# endif /* __or1k_hard_float__ */
|
|
#endif /* __CONTEXT_ENABLE_FPCSR */
|
|
/* Store ucp to non-argument syscall preserved register. */
|
|
l.ori r30, r4, 0
|
|
|
|
/* Get signal mask. */
|
|
/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
|
|
l.ori r6, r0, _NSIG8
|
|
l.addi r5, r3, __CONTEXT_SIGMASK_OFFSET
|
|
l.ori r4, r0, 0
|
|
l.ori r3, r0, SIG_BLOCK
|
|
l.ori r11, r0, SYS_ify (rt_sigprocmask)
|
|
/* Do the syscall. */
|
|
l.sys 1
|
|
l.nop
|
|
|
|
/* if -4096 < ret < 0 holds, it's an error */
|
|
l.sfgeui r11, 0xf001
|
|
l.bf 1f
|
|
l.nop
|
|
|
|
/* Same as setcontext. */
|
|
|
|
/* Restore signal mask. */
|
|
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
|
|
l.ori r6, r0, _NSIG8
|
|
l.ori r5, r0, 0
|
|
l.addi r4, r30, __CONTEXT_SIGMASK_OFFSET
|
|
l.ori r3, r0, SIG_SETMASK
|
|
l.ori r11, r0, SYS_ify (rt_sigprocmask)
|
|
/* Do the syscall. */
|
|
l.sys 1
|
|
l.nop
|
|
|
|
/* if -4096 < ret < 0 holds, it's an error */
|
|
l.sfgeui r11, 0xf001
|
|
l.bf 1f
|
|
l.nop
|
|
|
|
#ifdef __CONTEXT_ENABLE_FPCSR
|
|
# ifdef __or1k_hard_float__
|
|
/* Restore the floating point state. */
|
|
l.lwz r28, (MCONTEXT_FPCSR)(r30)
|
|
l.mtspr r0, r28, 20
|
|
# endif /* __or1k_hard_float__ */
|
|
#endif /* __CONTEXT_ENABLE_FPCSR */
|
|
|
|
/* Restore argument registers, for the makecontext case. */
|
|
l.lwz r3, (UCONTEXT_MCONTEXT + 3*4)(r30)
|
|
l.lwz r4, (UCONTEXT_MCONTEXT + 4*4)(r30)
|
|
l.lwz r5, (UCONTEXT_MCONTEXT + 5*4)(r30)
|
|
l.lwz r6, (UCONTEXT_MCONTEXT + 6*4)(r30)
|
|
l.lwz r7, (UCONTEXT_MCONTEXT + 7*4)(r30)
|
|
l.lwz r8, (UCONTEXT_MCONTEXT + 8*4)(r30)
|
|
|
|
/* Restore registers stored in getcontext. */
|
|
l.lwz r1, (UCONTEXT_MCONTEXT + 1*4)(r30)
|
|
l.lwz r2, (UCONTEXT_MCONTEXT + 2*4)(r30)
|
|
l.lwz r9, (UCONTEXT_MCONTEXT + 9*4)(r30)
|
|
l.lwz r10, (UCONTEXT_MCONTEXT + 10*4)(r30)
|
|
l.lwz r11, (UCONTEXT_MCONTEXT + 11*4)(r30)
|
|
l.lwz r14, (UCONTEXT_MCONTEXT + 14*4)(r30)
|
|
l.lwz r16, (UCONTEXT_MCONTEXT + 16*4)(r30)
|
|
l.lwz r18, (UCONTEXT_MCONTEXT + 18*4)(r30)
|
|
l.lwz r20, (UCONTEXT_MCONTEXT + 20*4)(r30)
|
|
l.lwz r22, (UCONTEXT_MCONTEXT + 22*4)(r30)
|
|
l.lwz r24, (UCONTEXT_MCONTEXT + 24*4)(r30)
|
|
l.lwz r26, (UCONTEXT_MCONTEXT + 26*4)(r30)
|
|
l.lwz r28, (UCONTEXT_MCONTEXT + 28*4)(r30)
|
|
l.lwz r30, (UCONTEXT_MCONTEXT + 30*4)(r30)
|
|
|
|
l.jr r11
|
|
l.ori r11, r0, 0
|
|
|
|
1: l.j __syscall_error
|
|
l.ori r3, r11, 0
|
|
|
|
END (__CONTEXT_FUNC_NAME)
|