155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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* Copyright © 2019,2020 Danny Milosavljevic <dannym@scratchpost.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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/* Note: GCC may or may not omit the frame pointer,
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* depending on whether it thinks this is a leaf function.
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*/
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// *INDENT-OFF*
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#if !__TINYC__
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void
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_start ()
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{
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asm (
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"mov x0,#0\n\t"
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"mov %0,x0\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 x0,#1\n\t"
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"mov %0,x0\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 x0,#2\n\t"
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"mov %0,x0\n"
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: "=r" (__stderr)
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: //no inputs ""
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);
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/* environ = argv + argc + 1 */
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asm (
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"ldr x0,[sp]\n\t" /* x0 = argc */
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"add x1,sp,#8\n\t" /* x1 = &argv[0] */
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"add x2,x0,#1\n\t" /* x2 = argc + 1 (skip zero word after argv) */
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"lsl x2,x2,#3\n\t" /* x2 = (argc + 1) << 3 */
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"add x2,x2,x1\n\t" /* x2 = ((argc + 1) << 3) + &argv[0] */
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"stp x1,x2,[sp,#0x10]!\n\t" /* argv, envp */
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"stp xzr,x0,[sp,#0x10]!\n\t" /* 0, argc */
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"mov %0,x2\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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"ldp xzr,x0,[sp],#0x10\n\t" /* 0, argc */
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"ldp x1,x2,[sp],#0x10\n\t" /* argv, envp */
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"bl main\n\t"
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"mov x7, #93\n\t"
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"svc #0\n\t"
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"wfi \n\t"
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);
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}
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#else //__TINYC__
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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__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe320f000\n"); //nop {0}
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#endif
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int *in = &__stdin;
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int *out = &__stdout;
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int *err = &__stderr;
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char ***env = &environ;
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#if 0
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__asm__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*in = 0x22;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*out = 0x33;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*err = 0x44;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*env = 0x55;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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#endif
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/* environ = argv + argc + 1 */
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__asm__ (".int 0xe59b000c\n"); //ldr r0, [fp, #12]
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__asm__ (".int 0xe28b1010\n"); //add r1, fp, #16
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__asm__ (".int 0xe2802001\n"); //add r2, r0, #1
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__asm__ (".int 0xe1a02102\n"); //lsl r2, r2, #2
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__asm__ (".int 0xe0822001\n"); //add r2, r2, r1
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// setup argc, argv, envp parameters on stack
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__asm__ (".int 0xe52d2004\n"); //push {r2} ; (str r2, [sp, #-4]!)
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__asm__ (".int 0xe52d1004\n"); //push {r1} ; (str r1, [sp, #-4]!)
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__asm__ (".int 0xe52d0004\n"); //push {r0} ; (str r0, [sp, #-4]!)
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__asm__ (".int 0xe1a02002\n"); //mov r2, r2
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// *in = 0;
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__asm__ (".int 0xe3a01000\n"); //mov r1, #0
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__asm__ (".int 0xe51b0004\n"); //ldr r0, [fp, #-4]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// *out = 1;
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__asm__ (".int 0xe3a01001\n"); //mov r1, #1
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__asm__ (".int 0xe51b0008\n"); //ldr r0, [fp, #-8]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// *err = 2;
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__asm__ (".int 0xe3a01002\n"); //mov r1, #2
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__asm__ (".int 0xe51b000c\n"); //ldr r0, [fp, #-12]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// *env = [sp, #8]
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__asm__ (".int 0xe59d1008\n"); //ldr r1, [sp, #8]
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__asm__ (".int 0xe51b0010\n"); //ldr r0, [fp, #-16]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// setup argc, argv, envp parameters in registers
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__asm__ (".int 0xe59d0000\n"); //ldr r0, [sp]
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__asm__ (".int 0xe59d1004\n"); //ldr r1, [sp, #4]
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__asm__ (".int 0xe59d2008\n"); //ldr r2, [sp, #8]
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main ();
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__asm__ (".int 0xe3a07001\n"); //mov r7, #1
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__asm__ (".int 0xef000000\n"); //svc 0x00000000
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__asm__ (".int 0xe320f003\n"); //wfi
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__asm__ (".int 0xe320f000\n"); //nop {0}
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}
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#endif //__TINYC__
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