diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/or1k/getcontext-common.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/or1k/getcontext-common.S | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/or1k/getcontext-common.S b/sysdeps/unix/sysv/linux/or1k/getcontext-common.S new file mode 100644 index 0000000000..9187749615 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/getcontext-common.S @@ -0,0 +1,88 @@ +/* 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) |