From 420d422e34704fe274edc6b8a4f957db56c50c69 Mon Sep 17 00:00:00 2001 From: "Jan (janneke) Nieuwenhuizen" Date: Sun, 22 Nov 2020 21:29:54 +0100 Subject: [PATCH] ARM: Add fake asm for crt1.c. * lib/linux/arm-mes-gcc/crt1.c (_start)[__TINYC__]: Use fake asm. --- lib/linux/arm-mes-gcc/crt1.c | 54 ++++++++++++++++++++++++++++++++---- 1 file changed, 49 insertions(+), 5 deletions(-) diff --git a/lib/linux/arm-mes-gcc/crt1.c b/lib/linux/arm-mes-gcc/crt1.c index 300dd8c9..98bed860 100644 --- a/lib/linux/arm-mes-gcc/crt1.c +++ b/lib/linux/arm-mes-gcc/crt1.c @@ -1,6 +1,6 @@ /* -*-comment-start: "//";comment-end:""-*- * GNU Mes --- Maxwell Equations of Software - * Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen + * Copyright © 2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen * Copyright © 2019,2020 Danny Milosavljevic * * This file is part of GNU Mes. @@ -22,9 +22,9 @@ #include //int main (int argc, char *argv[], char *envp[]); -/* Note: GCC automatically emits a preable in order to set up the frame pointer: -"push {fp}" -"add fp, sp, 0" +#if !__TINYC__ +/* Note: GCC automatically emits a preable in order to set up the +frame pointer: "push {fp}" "add fp, sp, 0" */ // *INDENT-OFF* void @@ -70,8 +70,52 @@ _start () "ldr r1,[sp, #4]\n\t" /* argv */ "ldr r2,[sp, #8]\n\t" /* envp */ "bl main\n\t" - "mov r7, #1\n\t" + "mov r7, #1\n\t" "swi #0\n\t" "wfi \n\t" ); } +#else //__TINYC__ +__asm__ (".global _start\n"); +__asm__ ("_start:\n"); +__asm__ (".int 0xe52db004\n"); //push {fp} ; (str fp, [sp, #-4]!) +__asm__ (".int 0xe28db000\n"); //add fp, sp, #0 +__asm__ (".int 0xe3a00000\n"); //mov r0, #0 +__asm__ (".int 0xe1a02000\n"); //mov r2, r0 +__asm__ (".int 0xe3003000\n"); //movw r3, #0 +__asm__ (".int 0xe3403000\n"); //movt r3, #0 +__asm__ (".int 0xe5832000\n"); //str r2, [r3] +__asm__ (".int 0xe3a00001\n"); //mov r0, #1 +__asm__ (".int 0xe1a02000\n"); //mov r2, r0 +__asm__ (".int 0xe3003000\n"); //movw r3, #0 +__asm__ (".int 0xe3403000\n"); //movt r3, #0 +__asm__ (".int 0xe5832000\n"); //str r2, [r3] +__asm__ (".int 0xe3a00002\n"); //mov r0, #2 +__asm__ (".int 0xe1a02000\n"); //mov r2, r0 +__asm__ (".int 0xe3003000\n"); //movw r3, #0 +__asm__ (".int 0xe3403000\n"); //movt r3, #0 +__asm__ (".int 0xe5832000\n"); //str r2, [r3] +__asm__ (".int 0xe59b0004\n"); //ldr r0, [fp, #4] +__asm__ (".int 0xe28b1008\n"); //add r1, fp, #8 +__asm__ (".int 0xe2802001\n"); //add r2, r0, #1 +__asm__ (".int 0xe1a02102\n"); //lsl r2, r2, #2 +__asm__ (".int 0xe0822001\n"); //add r2, r2, r1 +__asm__ (".int 0xe52d2004\n"); //push {r2} ; (str r2, [sp, #-4]!) +__asm__ (".int 0xe52d1004\n"); //push {r1} ; (str r1, [sp, #-4]!) +__asm__ (".int 0xe52d0004\n"); //push {r0} ; (str r0, [sp, #-4]!) +__asm__ (".int 0xe1a02002\n"); //mov r2, r2 +__asm__ (".int 0xe3003000\n"); //movw r3, #0 +__asm__ (".int 0xe3403000\n"); //movt r3, #0 +__asm__ (".int 0xe5832000\n"); //str r2, [r3] +__asm__ (".int 0xe59d0000\n"); //ldr r0, [sp] +__asm__ (".int 0xe59d1004\n"); //ldr r1, [sp, #4] +__asm__ (".int 0xe59d2008\n"); //ldr r2, [sp, #8] +__asm__ (".int 0xebfffffe\n"); //bl 0
+__asm__ (".int 0xe3a07001\n"); //mov r7, #1 +__asm__ (".int 0xef000000\n"); //svc 0x00000000 +__asm__ (".int 0xe320f003\n"); //wfi +__asm__ (".int 0xe320f000\n"); //nop {0} +__asm__ (".int 0xe28bd000\n"); //add sp, fp, #0 +__asm__ (".int 0xe49db004\n"); //pop {fp} ; (ldr fp, [sp], #4) +__asm__ (".int 0xe12fff1e\n"); //bx lr +#endif //__TINYC__