diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/or1k')
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/bits/procfs.h | 38 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/getcontext.S | 72 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/makecontext.c | 77 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/setcontext.S | 108 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/sigcontextinfo.h | 28 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/swapcontext.S | 116 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/sys/ucontext.h | 53 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/sys/user.h | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/or1k/ucontext_i.sym | 26 |
9 files changed, 519 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/or1k/bits/procfs.h b/sysdeps/unix/sysv/linux/or1k/bits/procfs.h new file mode 100644 index 0000000000..01a0699770 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/bits/procfs.h @@ -0,0 +1,38 @@ +/* Types for registers for sys/procfs.h. OpenRISC version. + Copyright (C) 2022 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/>. */ + +#ifndef _SYS_PROCFS_H +# error "Never include <bits/procfs.h> directly; use <sys/procfs.h> instead." +#endif + +#include <sys/ucontext.h> + +#define ELF_NGREG __NGREG + +/* Type for a general-purpose register. */ +typedef unsigned long int elf_greg_t; + +/* And the array of general-purpose registers. We could have used `struct + user_regs' directly, but tradition says that the register set is an array, + which does have some peculiar semantics, so leave it that way. + GDB uses this for prtrace GETREGSET, on OpenRISC the regset contains 32 + gprs the PC and the SR, 34 longs. */ +typedef elf_greg_t elf_gregset_t[34]; + +/* Register set for the floating-point registers. */ +typedef elf_greg_t elf_fpregset_t[32]; diff --git a/sysdeps/unix/sysv/linux/or1k/getcontext.S b/sysdeps/unix/sysv/linux/or1k/getcontext.S new file mode 100644 index 0000000000..2cc845c50c --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/getcontext.S @@ -0,0 +1,72 @@ +/* Save current context. OpenRISC version. + Copyright (C) 2022 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/>. */ + +#include <sysdep.h> +#include "ucontext_i.h" + +/* int getcontext (ucontext_t *ucp) + + Returns 0 on success -1 and errno on failure. + */ + .text +ENTRY(__getcontext) + /* 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 + + /* Get signal mask. */ + /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */ + l.ori r6, r0, _NSIG8 + l.addi r5, r3, UCONTEXT_SIGMASK + 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(__getcontext) +weak_alias(__getcontext, getcontext) diff --git a/sysdeps/unix/sysv/linux/or1k/makecontext.c b/sysdeps/unix/sysv/linux/or1k/makecontext.c new file mode 100644 index 0000000000..f0bcadfc74 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/makecontext.c @@ -0,0 +1,77 @@ +/* Create new context. OpenRISC version. + Copyright (C) 2022 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/>. */ + +#include <sysdep.h> +#include <stdarg.h> +#include <stdint.h> +#include <ucontext.h> + +/* makecontext sets up a stack and the registers for the + user context. The stack looks like this: + + +-----------------------+ + | padding as required | + +-----------------------+ + sp -> | parameters 7 to n | + +-----------------------+ + + The registers are set up like this: + r3-r8 : parameters 1 to 6 + r14 : uc_link + r1 : stack pointer + r2 : frame pointer, set to NULL +*/ +void +__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) +{ + extern void __startcontext (void); + unsigned long int *sp; + va_list ap; + int i; + + sp = (unsigned long int *) + ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); + + /* Allocate stack arguments. */ + sp -= argc < 6 ? 0 : argc - 6; + + /* Keep the stack aligned. */ + sp = (unsigned long int *) (((uintptr_t) sp) & -4L); + + /* Keep uc_link in r14. */ + ucp->uc_mcontext.__gprs[14] = (uintptr_t) ucp->uc_link; + /* Return address points to function __startcontext. */ + ucp->uc_mcontext.__gprs[9] = (uintptr_t) &__startcontext; + /* Frame pointer is null. */ + ucp->uc_mcontext.__gprs[2] = (uintptr_t) 0; + /* Restart in user-space starting at 'func'. */ + ucp->uc_mcontext.__gprs[11] = (uintptr_t) func; + /* Set stack pointer. */ + ucp->uc_mcontext.__gprs[1] = (uintptr_t) sp; + + va_start (ap, argc); + for (i = 0; i < argc; ++i) + if (i < 6) + ucp->uc_mcontext.__gprs[i + 3] = va_arg (ap, unsigned long int); + else + sp[i - 6] = va_arg (ap, unsigned long int); + + va_end (ap); +} + +weak_alias (__makecontext, makecontext) diff --git a/sysdeps/unix/sysv/linux/or1k/setcontext.S b/sysdeps/unix/sysv/linux/or1k/setcontext.S new file mode 100644 index 0000000000..ccfad220c1 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/setcontext.S @@ -0,0 +1,108 @@ +/* Set current context. OpenRISC version. + Copyright (C) 2022 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/>. */ + +#include <sysdep.h> +#include "ucontext_i.h" + +/* int setcontext (const ucontext_t *ucp) */ + .text +ENTRY(__setcontext) + l.ori r30, r3, 0 + + /* Restore signal mask. */ + /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ + l.ori r6, r0, _NSIG8 + l.ori r5, r0, 0 + l.addi r4, r3, UCONTEXT_SIGMASK + l.ori r3, r0, SIG_SETMASK + 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 + + /* Restore argument registers, for the makecontext case. */ + l.lwz r3, (UCONTEXT_MCONTEXT + 3*4)(r30) + l.lwz r4, (UCONTEXT_MCONTEXT + 4*4)(r30) + l.lwz r5, (UCONTEXT_MCONTEXT + 5*4)(r30) + l.lwz r6, (UCONTEXT_MCONTEXT + 6*4)(r30) + l.lwz r7, (UCONTEXT_MCONTEXT + 7*4)(r30) + l.lwz r8, (UCONTEXT_MCONTEXT + 8*4)(r30) + + /* Restore registers stored in getcontext. */ + l.lwz r1, (UCONTEXT_MCONTEXT + 1*4)(r30) + l.lwz r2, (UCONTEXT_MCONTEXT + 2*4)(r30) + l.lwz r9, (UCONTEXT_MCONTEXT + 9*4)(r30) + l.lwz r10, (UCONTEXT_MCONTEXT + 10*4)(r30) + l.lwz r11, (UCONTEXT_MCONTEXT + 11*4)(r30) + /* Restore r14-r30 even, callee saved registers. */ + l.lwz r14, (UCONTEXT_MCONTEXT + 14*4)(r30) + l.lwz r16, (UCONTEXT_MCONTEXT + 16*4)(r30) + l.lwz r18, (UCONTEXT_MCONTEXT + 18*4)(r30) + l.lwz r20, (UCONTEXT_MCONTEXT + 20*4)(r30) + l.lwz r22, (UCONTEXT_MCONTEXT + 22*4)(r30) + l.lwz r24, (UCONTEXT_MCONTEXT + 24*4)(r30) + l.lwz r26, (UCONTEXT_MCONTEXT + 26*4)(r30) + l.lwz r28, (UCONTEXT_MCONTEXT + 28*4)(r30) + l.lwz r30, (UCONTEXT_MCONTEXT + 30*4)(r30) + + l.jr r11 + l.ori r11, r0, 0 + +1: l.j __syscall_error + l.ori r3, r11, 0 + +END (__setcontext) +weak_alias (__setcontext, setcontext) + + /* We add a NOP here because when the unwinder is looking for the + enclosing function of the link register (r9) address FDE lookup will + use '$r9 - 1' finding setcontext which is wrong. This is because in + makecontext we have set r9 to the start of &__startcontext. + + If this NOP did not exist the unwinder would repeatedly find + __setcontext's FDE in an infinite loop. Modifiying/deleting the below + __startcontext's FDE has no help on this. */ + l.nop + +ENTRY(__startcontext) + + l.ori r3, r14, 0 + l.sfeq r3, r0 + /* If uc_link is not 0 resume there, otherwise exit. */ + l.bnf __setcontext + l.nop + +#ifdef SHARED + /* Obtain a pointer to .got in r16 */ + l.jal 0x8 + l.movhi r16, gotpchi(_GLOBAL_OFFSET_TABLE_-4) + l.ori r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+0) + l.add r16, r16, r9 + l.lwz r16, got(exit)(r16) + l.jr r16 +#else + l.j exit +#endif + l.nop + +END(__startcontext) diff --git a/sysdeps/unix/sysv/linux/or1k/sigcontextinfo.h b/sysdeps/unix/sysv/linux/or1k/sigcontextinfo.h new file mode 100644 index 0000000000..79e75af575 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/sigcontextinfo.h @@ -0,0 +1,28 @@ +/* Profile counter helper to get PC from sigcontext. OpenRISC version. + Copyright (C) 2022 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/>. */ + +#ifndef _SIGCONTEXTINFO_H +#define _SIGCONTEXTINFO_H + +static inline uintptr_t +sigcontext_get_pc (const ucontext_t *ctx) +{ + return ctx->uc_mcontext.__pc; +} + +#endif /* _SIGCONTEXTINFO_H */ diff --git a/sysdeps/unix/sysv/linux/or1k/swapcontext.S b/sysdeps/unix/sysv/linux/or1k/swapcontext.S new file mode 100644 index 0000000000..0d487ce2c6 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/swapcontext.S @@ -0,0 +1,116 @@ +/* Swap two contexts. OpenRISC version. + Copyright (C) 2022 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/>. */ + +#include <sysdep.h> +#include "ucontext_i.h" + +/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ + .text +ENTRY(__swapcontext) + + /* Same as getcontext. */ + /* 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 + + /* Store ucp to non-argument syscall preserved register. */ + l.ori r30, r4, 0 + + /* Get signal mask. */ + /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */ + l.ori r6, r0, _NSIG8 + l.addi r5, r3, UCONTEXT_SIGMASK + 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 + + /* Same as setcontext. */ + + /* Restore signal mask. */ + /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ + l.ori r6, r0, _NSIG8 + l.ori r5, r0, 0 + l.addi r4, r30, UCONTEXT_SIGMASK + l.ori r3, r0, SIG_SETMASK + 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 + + /* Restore argument registers, for the makecontext case. */ + l.lwz r3, (UCONTEXT_MCONTEXT + 3*4)(r30) + l.lwz r4, (UCONTEXT_MCONTEXT + 4*4)(r30) + l.lwz r5, (UCONTEXT_MCONTEXT + 5*4)(r30) + l.lwz r6, (UCONTEXT_MCONTEXT + 6*4)(r30) + l.lwz r7, (UCONTEXT_MCONTEXT + 7*4)(r30) + l.lwz r8, (UCONTEXT_MCONTEXT + 8*4)(r30) + + /* Restore registers stored in getcontext. */ + l.lwz r1, (UCONTEXT_MCONTEXT + 1*4)(r30) + l.lwz r2, (UCONTEXT_MCONTEXT + 2*4)(r30) + l.lwz r9, (UCONTEXT_MCONTEXT + 9*4)(r30) + l.lwz r10, (UCONTEXT_MCONTEXT + 10*4)(r30) + l.lwz r11, (UCONTEXT_MCONTEXT + 11*4)(r30) + l.lwz r14, (UCONTEXT_MCONTEXT + 14*4)(r30) + l.lwz r16, (UCONTEXT_MCONTEXT + 16*4)(r30) + l.lwz r18, (UCONTEXT_MCONTEXT + 18*4)(r30) + l.lwz r20, (UCONTEXT_MCONTEXT + 20*4)(r30) + l.lwz r22, (UCONTEXT_MCONTEXT + 22*4)(r30) + l.lwz r24, (UCONTEXT_MCONTEXT + 24*4)(r30) + l.lwz r26, (UCONTEXT_MCONTEXT + 26*4)(r30) + l.lwz r28, (UCONTEXT_MCONTEXT + 28*4)(r30) + l.lwz r30, (UCONTEXT_MCONTEXT + 30*4)(r30) + + l.jr r11 + l.ori r11, r0, 0 + +1: l.j __syscall_error + l.ori r3, r11, 0 + +END (__swapcontext) +weak_alias (__swapcontext, swapcontext) diff --git a/sysdeps/unix/sysv/linux/or1k/sys/ucontext.h b/sysdeps/unix/sysv/linux/or1k/sys/ucontext.h new file mode 100644 index 0000000000..6f334c6455 --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/sys/ucontext.h @@ -0,0 +1,53 @@ +/* ucontext_t definition, OpenRISC version. + Copyright (C) 2022 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/>. */ + +/* System V/OpenRISC compliant context switching support. */ + +#ifndef _SYS_UCONTEXT_H +#define _SYS_UCONTEXT_H 1 + +#include <features.h> + +#include <bits/types/sigset_t.h> +#include <bits/types/stack_t.h> + +/* Number of general registers. */ +#define __NGREG 32 +#ifdef __USE_MISC +# define NGREG __NGREG +#endif + +/* Context to describe whole processor state. */ +typedef struct + { + unsigned long int __gprs[__NGREG]; + unsigned long int __pc; + unsigned long int __sr; + } mcontext_t; + +/* Userlevel context. */ +typedef struct ucontext_t + { + unsigned long int __uc_flags; + struct ucontext_t *uc_link; + stack_t uc_stack; + mcontext_t uc_mcontext; + sigset_t uc_sigmask; + } ucontext_t; + +#endif /* sys/ucontext.h */ diff --git a/sysdeps/unix/sysv/linux/or1k/sys/user.h b/sysdeps/unix/sysv/linux/or1k/sys/user.h new file mode 100644 index 0000000000..c871f1a03d --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/sys/user.h @@ -0,0 +1 @@ +/* This file is not needed, but in practice gdb might try to include it. */ diff --git a/sysdeps/unix/sysv/linux/or1k/ucontext_i.sym b/sysdeps/unix/sysv/linux/or1k/ucontext_i.sym new file mode 100644 index 0000000000..a8d4db080f --- /dev/null +++ b/sysdeps/unix/sysv/linux/or1k/ucontext_i.sym @@ -0,0 +1,26 @@ +#include <inttypes.h> +#include <signal.h> +#include <stddef.h> +#include <sys/ucontext.h> + +-- Constants used by the rt_sigprocmask call. + +SIG_BLOCK +SIG_SETMASK + +_NSIG8 (_NSIG / 8) + +-- Offsets of the fields in the ucontext_t structure. +#define ucontext(member) offsetof (ucontext_t, member) +#define stack(member) ucontext (uc_stack.member) + +UCONTEXT_LINK ucontext (uc_link) +UCONTEXT_STACK ucontext (uc_stack) +UCONTEXT_MCONTEXT ucontext (uc_mcontext) +UCONTEXT_SIGMASK ucontext (uc_sigmask) + +STACK_SP stack (ss_sp) +STACK_SIZE stack (ss_size) +STACK_FLAGS stack (ss_flags) + +UCONTEXT_SIZE sizeof (ucontext_t) |