ARM: Mes C Library: Support gcc-sans-libc.
* lib/linux/arm-mes-gcc/crt1.c: New file. * lib/linux/arm-mes-gcc/mini.c: New file. * lib/linux/arm-mes-gcc/syscall.c: New file. * lib/arm-mes-gcc/setjmp.c: New file.
This commit is contained in:
Jan Nieuwenhuizen
parent
92d60477c5
commit
bfe710d2a2
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <setjmp.h>
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#include <stdlib.h>
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void
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longjmp (jmp_buf env, int val)
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{
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val = val == 0 ? 1 : val;
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// *INDENT-OFF*
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#if 1
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#warning LONGJMP not implemented
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#else
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asm (
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"mov 0x8(%ebp),%ebp\n\t" // env*
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"mov 0x4(%ebp),%ebx\n\t" // env->__pc
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"mov 0x8(%ebp),%esp\n\t" // env->__sp
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"mov 0x0(%ebp),%ebp\n\t" // env->__bp
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"jmp *%ebx\n\t" // jmp *PC
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);
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#endif
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// *INDENT-ON*
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// not reached
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exit (42);
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}
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int
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setjmp (jmp_buf env)
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{
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long *p = (long *) &env;
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env[0].__bp = p[-2];
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env[0].__pc = p[-1];
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env[0].__sp = (long) &env;
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return 0;
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}
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@ -0,0 +1,83 @@
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib-mini.h>
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//int main (int argc, char *argv[], char *envp[]);
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// *INDENT-OFF*
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void
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_start ()
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{
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#if 0
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asm (
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"mov $0,%%eax\n\t"
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"mov %%eax,%0\n"
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: "=r" (__stdin)
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: //no inputs ""
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);
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asm (
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"mov $1,%%eax\n\t"
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"mov %%eax,%0\n"
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: "=r" (__stdout)
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: //no inputs ""
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);
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asm (
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"mov $2,%%eax\n\t"
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"mov %%eax,%0\n"
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: "=r" (__stderr)
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: //no inputs ""
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);
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asm (
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"mov %%ebp,%%eax\n\t"
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"add $4,%%eax\n\t"
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"movzbl (%%eax),%%eax\n\t"
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"add $3,%%eax\n\t"
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"shl $2,%%eax\n\t"
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"add %%ebp,%%eax\n\t"
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"mov %%eax,%0\n\t"
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"push %%eax\n\t"
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: "=r" (environ)
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: //no inputs ""
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);
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asm (
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"mov %ebp,%eax\n\t"
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"add $8,%eax\n\t"
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"push %eax\n\t"
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"mov %ebp,%eax\n\t"
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"add $4,%eax\n\t"
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"movzbl (%eax),%eax\n\t"
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);
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#endif
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asm (
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"mov r2, $0\n\t"
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"push {r2}\n\t"
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"mov r1, $0\n\t"
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"push {r1}\n\t"
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"mov r0, $1\n\t"
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"push {r0}\n\t"
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"bl main\n\t"
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"mov r7, $1\n\t"
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"swi $0\n\t"
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"wfi \n\t"
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);
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}
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@ -0,0 +1,59 @@
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mes/lib-mini.h"
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#define SYS_exit "0x01"
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#define SYS_write "0x04"
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// *INDENT-OFF*
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void
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_exit (int code)
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{
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asm (
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"mov r7, $"SYS_exit"\n\t"
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"mov r0, %0\n\t"
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"swi $0\n\t"
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: // no outputs "=" (r)
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: "r" (code)
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: "r0"//, "r7" // error: r7 cannot be used in asm here
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);
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// not reached
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_exit (0);
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}
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ssize_t
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_write (int filedes, void const *buffer, size_t size)
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{
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long r;
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asm (
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"mov r7, $"SYS_write"\n\t"
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"mov r0, %1\n\t"
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"mov r1, %2\n\t"
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"mov r3, %3\n\t"
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"swi $0\n\t"
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"mov %0, r0\n\t"
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: "=r" (r)
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: "r" (filedes), "r" (buffer), "r" (size)
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: "r0", "r1", "r2"//, "r7"
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);
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return r;
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}
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// *INDENT-ON*
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@ -0,0 +1,164 @@
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <linux/x86/syscall.h>
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// *INDENT-OFF*
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long
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_sys_call (long sys_call)
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{
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long r;
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asm (
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"mov r7, %1\n\t"
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"swi $0\n\t"
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"mov r0, %0\n\t"
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: "=r" (r)
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: "r" (sys_call)
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: "r0" // , "r7" // error: r7 cannot be used in asm here
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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long
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_sys_call1 (long sys_call, long one)
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{
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long r;
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asm (
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"mov r7, %1\n\t"
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"mov r0, %2\n\t"
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"swi $0\n\t"
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"mov r0, %0\n\t"
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: "=r" (r)
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: "r" (sys_call), "r" (one)
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: "r0"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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long
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_sys_call2 (long sys_call, long one, long two)
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{
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long r;
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asm (
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"mov r7, %1\n\t"
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"mov r0, %2\n\t"
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"mov r1, %3\n\t"
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"swi $0\n\t"
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"mov r0, %0\n\t"
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: "=r" (r)
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: "r" (sys_call), "r" (one), "r" (two)
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: "r0", "r1"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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long
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_sys_call3 (long sys_call, long one, long two, long three)
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{
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long r;
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asm (
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"mov r7, %1\n\t"
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"mov r0, %2\n\t"
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"mov r1, %3\n\t"
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"mov r2, %4\n\t"
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"swi $0\n\t"
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"mov r0, %0\n\t"
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: "=r" (r)
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: "r" (sys_call), "r" (one), "r" (two), "r" (three)
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: "r0", "r1", "r2"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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long
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_sys_call4 (long sys_call, long one, long two, long three, long four)
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{
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long r;
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asm (
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"mov r7, %1\n\t"
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"mov r0, %2\n\t"
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"mov r1, %3\n\t"
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"mov r2, %4\n\t"
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"mov r3, %5\n\t"
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"swi $0\n\t"
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"mov r0, %0\n\t"
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: "=r" (r)
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: "r" (sys_call), "r" (one), "r" (two), "r" (three), "r" (four)
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: "r0", "r1", "r2", "r3"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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long
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_sys_call6 (long sys_call, long one, long two, long three, long four, long five, long six)
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{
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long r;
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asm (
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"mov r7, %1\n\t"
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"mov r0, %2\n\t"
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"mov r1, %3\n\t"
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"mov r2, %4\n\t"
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"mov r3, %5\n\t"
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"mov r4, %6\n\t"
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"mov r5, %7\n\t"
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"swi $0\n\t"
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"mov r0, %0\n\t"
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: "=r" (r)
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: "r" (sys_call), "r" (one), "r" (two), "r" (three), "r" (four), "r" (five), "r" (six)
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: "r0", "r1", "r2", "r3", "r4", "r5"
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);
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return r;
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}
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