+2002-03-28 Andreas Jaeger <aj@suse.de>
+
+ * sysdeps/unix/sysv/linux/x86_64/swapcontext.S: New.
+ * sysdeps/unix/sysv/linux/x86_64/getcontext.S: New.
+ * sysdeps/unix/sysv/linux/x86_64/setcontext.S: New.
+ * sysdeps/unix/sysv/linux/x86_64/ucontext_i.h: New.
+
2002-03-27 Andreas Jaeger <aj@suse.de>
* sysdeps/unix/sysv/linux/x86_64/bits/sigcontext.h (struct
--- /dev/null
+/* Save current context.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int __getcontext (ucontext_t *ucp)
+
+ Saves the machine context in UCP such that when it is activated,
+ it appears as if __getcontext() returned again.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to save anything
+ other than the PRESERVED state. */
+
+
+ENTRY(__getcontext)
+ /* Save the preserved registers and the return address. */
+ movq %rbx, oRBX(%rdi)
+ movq %rbp, oRBP(%rdi)
+ movq %r12, oR12(%rdi)
+ movq %r13, oR13(%rdi)
+ movq %r14, oR14(%rdi)
+ movq %r15, oR15(%rdi)
+
+ movq (%rsp), %rcx
+ movq %rcx, oRIP(%rdi)
+ leaq 8(%rsp), %rcx /* Exclude the return address. */
+ movq %rcx, oRSP(%rdi)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+
+ leaq oFPREGSMEM(%rdi), %rcx
+ movq %rcx, oFPREGS(%rdi)
+ /* Save the floating-point environment. */
+ fnstenv (%rcx)
+ stmxcsr oMXCSR(%rdi)
+
+ /* Save the current signal mask with
+ rt_sigprocmask (SIG_BLOCK, NULL, set,_NSIG/8). */
+ leaq oSIGMASK(%rdi), %rdx
+ xorq %rsi,%rsi
+ movq $SIG_BLOCK, %rdi
+ movq $_NSIG8,%r10
+ movq $__NR_rt_sigprocmask, %rax
+ syscall
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* All done, return 0 for success. */
+ xorq %rax, %rax
+L(pseudo_end):
+ ret
+PSEUDO_END(__getcontext)
+
+weak_alias(__getcontext, getcontext)
--- /dev/null
+/* Install given context.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+/* int __setcontext (const ucontext_t *ucp)
+
+ Restores the machine context in UCP and thereby resumes execution
+ in that context.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to restore anything
+ other than the PRESERVED state. */
+
+ENTRY(__setcontext)
+ /* Save argument since syscall will destroy it. */
+ pushq %rdi
+
+ /* Set the signal mask with
+ rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
+ leaq oSIGMASK(%rdi), %rsi
+ xorq %rdx, %rdx
+ movq $SIG_SETMASK, %rdi
+ movq $_NSIG8,%r10
+ movq $__NR_rt_sigprocmask, %rax
+ syscall
+ popq %rdi /* Reload %rdi, adjust stack. */
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movq oFPREGS(%rdi), %rcx
+ fldenv (%rcx)
+ ldmxcsr oMXCSR(%rdi)
+
+
+ /* Load the new stack pointer and the preserved registers. */
+ movq oRSP(%rdi), %rsp
+ movq oRBX(%rdi), %rbx
+ movq oRBP(%rdi), %rbp
+ movq oR12(%rdi), %r12
+ movq oR13(%rdi), %r13
+ movq oR14(%rdi), %r14
+ movq oR15(%rdi), %r15
+
+ /* The following ret should return to the address set with
+ getcontext. Therefore push the address on the stack. */
+ movq oRIP(%rdi), %rcx
+ pushq %rcx
+
+ /* Clear rax to indicate success. */
+ xorq %rax, %rax
+
+L(pseudo_end):
+ ret
+PSEUDO_END(__setcontext)
+
+weak_alias(__setcontext, setcontext)
--- /dev/null
+/* Save current context and install the given one.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
+
+ Saves the machine context in oucp such that when it is activated,
+ it appears as if __swapcontextt() returned again, restores the
+ machine context in ucp and thereby resumes execution in that
+ context.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to save anything
+ other than the PRESERVED state. */
+
+ENTRY(__swapcontext)
+ /* Save the preserved registers and the return address. */
+ movq %rbx, oRBX(%rdi)
+ movq %rbp, oRBP(%rdi)
+ movq %r12, oR12(%rdi)
+ movq %r13, oR13(%rdi)
+ movq %r14, oR14(%rdi)
+ movq %r15, oR15(%rdi)
+
+ movq (%rsp), %rcx
+ movq %rcx, oRIP(%rdi)
+ leaq 8(%rsp), %rcx /* Exclude the return address. */
+ movq %rcx, oRSP(%rdi)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+ leaq oFPREGSMEM(%rdi), %rcx
+ movq %rcx, oFPREGS(%rdi)
+ /* Save the floating-point environment. */
+ fnstenv (%rcx)
+ stmxcsr oMXCSR(%rdi)
+
+
+ /* The syscall destroys some registers, save them. */
+ movq %rsi, %r12
+
+ /* Save the current signal mask and install the new one with
+ rt_sigprocmask (SIG_BLOCK, newset, oldset,_NSIG/8). */
+ leaq oSIGMASK(%rdi), %rdx
+ leaq oSIGMASK(%rsi), %rsi
+ movq $SIG_SETMASK, %rdi
+ movq $_NSIG8,%r10
+ movq $__NR_rt_sigprocmask, %rax
+ syscall
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* Restore destroyed registers. */
+ movq %r12, %rsi
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movq oFPREGS(%rsi), %rcx
+ fldenv (%rcx)
+ ldmxcsr oMXCSR(%rsi)
+
+ /* Load the new stack pointer and the preserved registers. */
+ movq oRSP(%rsi), %rsp
+ movq oRBX(%rsi), %rbx
+ movq oRBP(%rsi), %rbp
+ movq oR12(%rsi), %r12
+ movq oR13(%rsi), %r13
+ movq oR14(%rsi), %r14
+ movq oR15(%rsi), %r15
+
+ /* The following ret should return to the address set with
+ getcontext. Therefore push the address on the stack. */
+ movq oRIP(%rsi), %rcx
+ pushq %rcx
+
+ /* Clear rax to indicate success. */
+ xorq %rax, %rax
+
+L(pseudo_end):
+ ret
+PSEUDO_END(__swapcontext)
+
+weak_alias(__swapcontext, swapcontext)
--- /dev/null
+/* Offsets and other constants needed in the *context() function
+ implementation for Linux/x86-64.
+ Copyright (C) 2002 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#define SIG_BLOCK 0
+#define SIG_SETMASK 2
+
+/* Since we cannot include a header to define _NSIG/8, we define it
+ here. */
+#define _NSIG8 8
+
+/* Offsets of the fields in the ucontext_t structure. */
+#define oRBP 120
+#define oRSP 160
+#define oRBX 128
+#define oR12 72
+#define oR13 80
+#define oR14 88
+#define oR15 96
+#define oRAX 144
+#define oRIP 168
+#define oFPREGS 208
+#define oSIGMASK 280
+#define oFPREGSMEM 408
+#define oMXCSR 432
projects / platform / upstream / glibc.git / commitdiff