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Diffstat (limited to 'libc/sysdeps/linux/mips/setcontext.S')
-rw-r--r--libc/sysdeps/linux/mips/setcontext.S191
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)