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Verify that setjmp and longjmp work correctly between user contexts. Arrange stacks for uctx_func1 and uctx_func2 so that ____longjmp_chk works when setjmp and longjmp are called from different user contexts. Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/* Check setjmp/longjmp between user contexts.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#include <ucontext.h>
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#include <stackinfo.h>
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static ucontext_t uctx_main, uctx_func1, uctx_func2;
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const char *str1 = "\e[31mswapcontext(&uctx_func1, &uctx_main)\e[0m";
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const char *str2 = "\e[34mswapcontext(&uctx_func2, &uctx_main)\e[0m";
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const char *fmt1 = "\e[31m";
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const char *fmt2 = "\e[34m";
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static jmp_buf jmpbuf;
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#define handle_error(msg) \
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do { perror(msg); exit(EXIT_FAILURE); } while (0)
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__attribute__((noinline, noclone))
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static void
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func4(ucontext_t *uocp, ucontext_t *ucp, const char *str, const char *fmt)
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{
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printf(" %sfunc4: %s\e[0m\n", fmt, str);
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if (swapcontext(uocp, ucp) == -1)
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handle_error("swapcontext");
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printf(" %sfunc4: returning\e[0m\n", fmt);
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}
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__attribute__((noinline, noclone))
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static void
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func3(ucontext_t *uocp, ucontext_t *ucp, const char *str, const char *fmt)
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{
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printf(" %sfunc3: func4(uocp, ucp, str)\e[0m\n", fmt);
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func4(uocp, ucp, str, fmt);
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printf(" %sfunc3: returning\e[0m\n", fmt);
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}
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__attribute__((noinline, noclone))
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static void
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func1(void)
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{
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while ( 1 )
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{
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printf(" \e[31mfunc1: func3(&uctx_func1, &uctx_main, str1)\e[0m\n");
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if (setjmp (jmpbuf) != 0)
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{
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printf(" %sfunc1: from longjmp\e[0m\n", fmt1);
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exit (EXIT_SUCCESS);
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}
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func3( &uctx_func1, &uctx_main, str1, fmt1);
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}
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}
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__attribute__((noinline, noclone))
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static void
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func2(void)
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{
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while ( 1 )
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{
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printf(" \e[34mfunc2: func3(&uctx_func2, &uctx_main, str2)\e[0m\n");
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func3(&uctx_func2, &uctx_main, str2, fmt2);
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printf(" %sfunc2: calling longjmp\e[0m\n", fmt2);
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longjmp (jmpbuf, 1);
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}
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}
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static int
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do_test (void)
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{
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/* ____longjmp_chk has */
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#if 0
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#ifdef _STACK_GROWS_DOWN
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#define called_from(this, saved) ((this) < (saved))
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#else
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#define called_from(this, saved) ((this) > (saved))
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#endif
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/* If "env" is from a frame that called us, we're all set. */
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if (called_from(this_frame, saved_frame))
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__longjmp (env, val);
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#endif
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/* Arrange stacks for uctx_func1 and uctx_func2 so that called_from
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is true when setjmp is called from uctx_func1 and longjmp is called
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from uctx_func2. */
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#ifdef _STACK_GROWS_DOWN
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# define UCTX_FUNC1_STACK 1
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# define UCTX_FUNC2_STACK 0
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#else
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# define UCTX_FUNC1_STACK 0
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# define UCTX_FUNC2_STACK 1
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#endif
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char func_stack[2][16384];
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int i;
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if (getcontext(&uctx_func1) == -1)
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handle_error("getcontext");
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uctx_func1.uc_stack.ss_sp = func_stack[UCTX_FUNC1_STACK];
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uctx_func1.uc_stack.ss_size = sizeof (func_stack[UCTX_FUNC1_STACK]);
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uctx_func1.uc_link = &uctx_main;
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makecontext(&uctx_func1, func1, 0);
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if (getcontext(&uctx_func2) == -1)
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handle_error("getcontext");
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uctx_func2.uc_stack.ss_sp = func_stack[UCTX_FUNC2_STACK];
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uctx_func2.uc_stack.ss_size = sizeof (func_stack[UCTX_FUNC2_STACK]);
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uctx_func2.uc_link = &uctx_func1;
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makecontext(&uctx_func2, func2, 0);
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for ( i = 0; i < 2; i++ )
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{
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if (swapcontext(&uctx_main, &uctx_func1) == -1)
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handle_error("swapcontext");
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printf(" \e[35mmain: swapcontext(&uctx_main, &uctx_func2)\n\e[0m");
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if (swapcontext(&uctx_main, &uctx_func2) == -1)
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handle_error("swapcontext");
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printf(" \e[35mmain: swapcontext(&uctx_main, &uctx_func1)\n\e[0m");
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}
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exit(EXIT_FAILURE);
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}
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#include <support/test-driver.c>
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