From 6a3ef39feb635f529da9e36975ba77a26c1ff3b4 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Sun, 23 Nov 2014 14:00:52 +0100
Subject: passing argv and argc to main, and fixed ELF load.

---
 kernel/syscalls.c | 67 +++++++++++++++++++++++++++++--------------------------
 1 file changed, 35 insertions(+), 32 deletions(-)

(limited to 'kernel/syscalls.c')

diff --git a/kernel/syscalls.c b/kernel/syscalls.c
index 06caf2d..9f29750 100644
--- a/kernel/syscalls.c
+++ b/kernel/syscalls.c
@@ -140,9 +140,36 @@ int syscall_readdir(const char *name,fs_dirent *dirs,int max)
 
 int syscall_execve(char *name, char **argv, char **env)
 {
-#ifdef LOG_SYSCALLS
+    #ifdef LOG_SYSCALLS
     log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"execve (name=0x%08X, argvs=0x%08X,  env=0x%08X)", name,argv,env);
-#endif
+    #endif
+
+
+    char arg1[100];
+    char arg2[100];
+    char arg3[100];
+    char arg4[100];
+    char arg5[100];
+    char *argvcopy[]={arg1,arg2,arg3,arg4,arg5};
+
+    int argc=0;
+
+    if(argv!=NULL)
+    {
+	while(argv[argc+1]!=NULL)
+	{
+	    //log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"arg at 0x%08X: %s", argv[argc],argv[argc]);
+
+	    int i=-1;
+	    do{
+		    i++;
+        	    argvcopy[argc][i]=argv[argc+1][i];
+	    }while(argv[argc+1][i]!=0);
+
+	    argc++;
+	}
+    }
+    argvcopy[argc]=NULL;
 
 
     //TODO: load ELF binary and move this to own compilation unit
@@ -151,7 +178,6 @@ int syscall_execve(char *name, char **argv, char **env)
     ext2_check(EXT2_RAM_ADDRESS);
     ext2_inode_content(EXT2_RAM_ADDRESS,name,0x800000,0x100000);
 
-
     Elf32_Ehdr *elf;
     elf=0x800000;
 
@@ -226,39 +252,16 @@ int syscall_execve(char *name, char **argv, char **env)
 
     }
 
+    // argv / argc
+    asm("push %0" :: "r" (argvcopy));
+    asm("push %0" :: "r" (argc));
 
-    /*
-    // iterate over section headers
-    for(int shidx=0;shidx<elf->e_shnum;shidx++)
-    {	
-	Elf32_Shdr *shdr=0x800000+elf->e_shoff;//+shidx*elf->e_shentsize;
-	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"-- SECTION HEADER %d --",shidx);
-	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"sh-name idx: %d",shdr->sh_name);
-	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"sh-type: %d",shdr->sh_type);
-	while(1);
-    }
-    */
-
-    static char arg1[]="x";;
-    static char arg2[]="blah";
-    static char arg3[]="foo";
-    static char *args[]={arg1,arg2,arg3};
-
-    asm("push %0" :: "r" (args)); //argv
-    asm("push $3");//argc
-
-    asm("push $0x800080");
+    // push addr and return to it
+    asm("push %0"::"r"(elf->e_entry));
     asm("ret");
 
-    while(1);
-    /*
+    // this is never reached!
 
-    // autorun "user-space" prog
-    asm("push $10");//argv TODO: addresse
-    asm("push $20"); //argc TODO: real number of params!
-    asm("push $0x800000");
-    asm("ret");
-    */
 }
 
 
-- 
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