/* Save current context.  OpenRISC common version.
   Copyright (C) 2024 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 getcontext 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 getcontext (ucontext_t *ucp)

   Returns 0 on success -1 and errno on failure.
 */
	.text
ENTRY(__CONTEXT_FUNC_NAME)
	/* 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	r4, r0, 20
	l.sw	(MCONTEXT_FPCSR)(r3), r4
# else
	/* Store zero to indicate default rounding as per softfloat.  */
	l.sw	(MCONTEXT_FPCSR)(r3), r0
# endif /* __or1k_hard_float__ */
#endif /* __CONTEXT_ENABLE_FPCSR */

	/* 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

	l.jr	r9
	 l.ori r11, r0, 0

1:	l.j	__syscall_error
	 l.ori	r3, r11, 0

END(__CONTEXT_FUNC_NAME)