fixed syscall_execve and indirectly tput

1 files changed, 42 insertions, 78 deletions

diff --git a/kernel/syscalls.c b/kernel/syscalls.c
index 9cabf25..e43c509 100644
--- a/kernel/syscalls.c
+++ b/kernel/syscalls.c
@@ -119,56 +119,57 @@ int syscall_readdir(const char *name,fs_dirent *dirs,int max)
     return fs_readdir(name,dirs,max);
 }
 
-
-int syscall_execve(char *name, char **argv1, char **env1)
+int copy_args(char **in, char **out)
 {
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"copy_args(0x%08x, 0x%08X)",in,out);
+    int count=0;
+    while(in[count]!=NULL)
+    {
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"args(0x%08x: %s)",in[count],out);
+	count++;
+    };
 
-    int temp=0x1;
-    uint32_t *entry=temp;
-    temp+=4;
-
-    int env_count=0;
-    do{env_count++;}while(env1[env_count]!=NULL);
-
-    int arg_count=0;
-    do{arg_count++;}while(argv1[arg_count]!=NULL);
-
-    char **env=temp;
-    temp+=sizeof(char **)*(env_count+1); 
-    char **argv=temp;
-    temp+=sizeof(char **)*(arg_count+1); 
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"copy_args : count: %d",count);
+    
+    char **pos=out;
+    pos+=sizeof(char **)*(count+1); 
 
     int i=0;
     do{
-	int l=strlen(env1[i]);
-	char *env_var=temp;
-	temp+=sizeof(char *)*(l+1); 
-	memcpy(env_var,env1[i],l+1);
-	env[i]=env_var;
+	int l=strlen(in[i]);
+	char *var=pos;
+	memcpy(var,in[i],l+1);
+	pos+=sizeof(char *)*(l+1); 
+	out[i]=var;
 	i++;
-    }while(env1[i]!=NULL);
-    env[i]=NULL;
+    }while(in[i]!=NULL);
+    out[i]=NULL;
 
-    i=0;
-    do{
-	int l=strlen(argv1[i]);
-	char *arg_var=temp;
-	temp+=sizeof(char *)*(l+1); 
-	memcpy(arg_var,argv1[i],l+1);
-	argv[i]=arg_var;
-	i++;
-    }while(argv1[i]!=NULL);
-    argv[i]=NULL;
+    return count;
+}
+
+
+int *entry_global=1;
+char **argv_global=10;
+char **env_global=300;
+char **argv=0x8000000;
+char **env=0x8000000+300;
 
 
+int syscall_execve(char *name, char **argv1, char **env1)
+{
     #ifdef LOG_SYSCALLS
     log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"execve (name=0x%08X(%s), argvs=0x%08X,  env=0x%08X)", name,name,argv1,env1);
     #endif
-    
+
+     copy_args(argv1,argv_global);
+     copy_args(env1,env_global);
+
     uint32_t alloc;
-    *entry=load_elf(name,&alloc);
+    *entry_global=load_elf(name,&alloc);
+    task_set_brk(alloc);
 
-    if(!*entry)
+    if(!*entry_global)
     {
 	#ifdef LOG_SYSCALLS
 	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"execve: bailing out!");
@@ -179,55 +180,18 @@ int syscall_execve(char *name, char **argv1, char **env1)
     /* try to move this to asm */
     //asm volatile("jmp .");
     asm volatile("mov $0x8fff000,%esp"); // set stack at high end of process image
- 
 
-    // TODO: avoid code duplication for argv and env!!
-    char **env_new=alloc;
-    alloc+=sizeof(char **)*(env_count+1); 
-
-    i=0;
-    do{
-	int l=strlen(env[i]);
-	char *env_var=alloc;
-	alloc+=sizeof(char)*l+1;
-	memcpy(env_var,env[i],l+1);
-	env_new[i]=env_var;
-        #ifdef LOG_SYSCALLS
-        log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"envr %d : 0x%08X : %s" ,i,env_new[i],env_new[i]);
-        #endif
-	i++;
-    }while(env[i]!=NULL);
-    env_new[i]=NULL;
+    int arg_count=copy_args(argv_global,argv);
+    copy_args(env_global,env);
 
-    char **argv_new=alloc;
-    alloc+=sizeof(char **)*(arg_count+1);
-    i=0;
-    do{
-	int l=strlen(argv[i]);
-	char *arg_var=alloc;
-	alloc+=sizeof(char)*l+1;
-	memcpy(arg_var,argv[i],l+1);
-	argv_new[i]=arg_var;
-	#ifdef LOG_SYSCALLS
-        log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"arg %d : 0x%08X : %s" ,i,argv_new[i],argv_new[i]);
-        #endif
-	i++;
-    }while(argv[i]!=NULL);
-
-
-    #ifdef LOG_SYSCALLS
     log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"argc: %d" ,arg_count);
-    #endif
-
-    task_set_brk(alloc);
-
 
-    asm volatile ("push %0" :: "r" (argv_new));
+    asm volatile ("push %0" :: "r" (argv));
     asm volatile ("push %0" :: "r" (arg_count));
-    asm volatile ("push %0" :: "r" (env_new));
+    asm volatile ("push %0" :: "r" (env));
 
     // push addr and return to it
-    asm volatile ("push %0"::"r"(*entry));
+    asm volatile ("push %0"::"r"(*entry_global));
     
     asm volatile ("sti");
     asm volatile ("ret");