diff options
Diffstat (limited to 'libc/sysdeps/linux/mips/setcontext.S')
| -rw-r--r-- | libc/sysdeps/linux/mips/setcontext.S | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/mips/setcontext.S b/libc/sysdeps/linux/mips/setcontext.S new file mode 100644 index 000000000..d3cde0e50 --- /dev/null +++ b/libc/sysdeps/linux/mips/setcontext.S @@ -0,0 +1,191 @@ +/* Set current context. + Copyright (C) 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Maciej W. Rozycki <macro@codesourcery.com>. + + 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 + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <sys/asm.h> +#include <sys/fpregdef.h> +#include <sys/regdef.h> + +#include "ucontext_i.h" + +/* int setcontext (const ucontext_t *ucp) */ + + .text +LOCALSZ = 0 +ARGSZ = 0 +MASK = 0x00000000 +#ifdef __PIC__ +LOCALSZ = 1 /* save gp */ +#endif +#if _MIPS_SIM != _ABIO32 +ARGSZ = 1 /* save a0 */ +# ifdef __PIC__ +MASK = 0x10000000 +# endif +#endif +FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK +GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG) +#if _MIPS_SIM != _ABIO32 +A0OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */ +#else +A0OFF = FRAMESZ + (0 * SZREG) /* caller-allocated */ +#endif + +NESTED (__setcontext, FRAMESZ, ra) + .mask MASK, -(ARGSZ * SZREG) + .fmask 0x00000000, 0 + +#ifdef __PIC__ + SETUP_GP +#endif + + PTR_ADDIU sp, -FRAMESZ + +#ifdef __PIC__ + SETUP_GP64 (GPOFF, __setcontext) + SAVE_GP (GPOFF) +#endif + +#ifdef PROF + .set noat + move AT, ra + jal _mcount + .set at +#endif + + /* Check for the magic flag. */ + li v0, 1 + REG_L v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */ + bne v0, v1, 98f + + REG_S a0, A0OFF(sp) + +/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ + li a3, _NSIG8 + move a2, zero + PTR_ADDU a1, a0, UCONTEXT_SIGMASK + li a0, SIG_SETMASK + + li v0, SYS_ify (rt_sigprocmask) + syscall + bnez a3, 99f + + REG_L v0, A0OFF(sp) + +#ifdef __mips_hard_float +# if _MIPS_SIM == _ABI64 + l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0) + +# else /* _MIPS_SIM != _ABI64 */ + l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0) + l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0) + +# endif /* _MIPS_SIM != _ABI64 */ + + lw v1, MCONTEXT_FPC_CSR(v0) + ctc1 v1, fcr31 +#endif /* __mips_hard_float */ + + /* Note the contents of argument registers will be random + unless makecontext() has been called. */ + REG_L a0, (4 * SZREG + MCONTEXT_GREGS)(v0) + REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0) + REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0) + REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0) +#if _MIPS_SIM != _ABIO32 + REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0) + REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0) + REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0) + REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0) +#endif + + REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0) + REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0) +#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32 + REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0) +#endif + REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0) + REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0) + REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0) + REG_L t9, MCONTEXT_PC(v0) + + move v0, zero + jr t9 + +98: + /* This is a context obtained from a signal handler. + Perform a full restore by pushing the context + passed onto a simulated signal frame on the stack + and call the signal return syscall as if a signal + handler exited normally. */ + PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK) + + /* Only ucontext is referred to from rt_sigreturn, + copy it. */ + PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT + li t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1 +0: + REG_L t2, (a0) + PTR_ADDIU a0, SZREG + REG_S t2, (t1) + PTR_ADDIU t1, SZREG + .set noreorder + bgtz t3, 0b + addiu t3, -1 + .set reorder + +/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */ + li v0, SYS_ify (rt_sigreturn) + syscall + + /* Restore the stack and fall through to the error + path. Successful rt_sigreturn never returns to + its calling place. */ + PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK) +99: +#ifdef __PIC__ + PTR_LA t9, JUMPTARGET (__syscall_error) + RESTORE_GP64 + PTR_ADDIU sp, FRAMESZ + jr t9 + +#else /* ! __PIC__ */ + + j JUMPTARGET (__syscall_error) +#endif /* ! __PIC__ */ +PSEUDO_END (__setcontext) + +weak_alias (__setcontext, setcontext) |