removed pdclib, strange things were happening..., user shell kinda works now

programs/rocksh/compile_commands.json

@@ -0,0 +1,36 @@
+[
+  {
+    "arguments": [
+      "/home/slinky/opt/cross/bin/i686-elf-gcc",
+      "-ffreestanding",
+      "-O2",
+      "-Wall",
+      "-Wextra",
+      "-I../../rocklibc/include",
+      "-c",
+      "-o",
+      "crt0.o",
+      "crt0.S"
+    ],
+    "directory": "/home/slinky/source/RockOS/programs/rocksh",
+    "file": "/home/slinky/source/RockOS/programs/rocksh/crt0.S",
+    "output": "/home/slinky/source/RockOS/programs/rocksh/crt0.o"
+  },
+  {
+    "arguments": [
+      "/home/slinky/opt/cross/bin/i686-elf-gcc",
+      "-ffreestanding",
+      "-O2",
+      "-Wall",
+      "-Wextra",
+      "-I../../rocklibc/include",
+      "-c",
+      "-o",
+      "main.o",
+      "main.c"
+    ],
+    "directory": "/home/slinky/source/RockOS/programs/rocksh",
+    "file": "/home/slinky/source/RockOS/programs/rocksh/main.c",
+    "output": "/home/slinky/source/RockOS/programs/rocksh/main.o"
+  }
+]

programs/rocksh/crt0.S

@@ -0,0 +1,21 @@
+.global _start
+.extern exit
+.section .text
+_start: 
+    xor %ebp, %ebp
+
+    mov (%esp), %eax
+    lea 4(%esp), %ebx
+    lea 8(%esp,%eax,4), %ecx
+
+    and $-16, %esp
+
+    push %ecx
+    push %ebx
+    push %eax
+
+    call main
+
+    push %eax
+    call exit
+

programs/rocksh/linker.ld

@@ -0,0 +1,31 @@
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 0x40000000;
+
+    .text ALIGN(4K) :
+    {
+        /* Force the crt0.o entry code to be placed FIRST in memory */
+        KEEP(*crt0.o(.text))
+        *(.text .text.*)
+    }
+
+    .rodata ALIGN(4K) :
+    {
+        *(.rodata .rodata.*)
+    }
+
+    .data ALIGN(4K) :
+    {
+        *(.data .data.*)
+    }
+
+    .bss ALIGN(4K) :
+    {
+        _bss_start = .;
+        *(.bss .bss.*)
+        *(COMMON)
+        _bss_end = .;
+    }
+}

programs/rocksh/main.c

@@ -0,0 +1,46 @@
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+const char* shell_prompt = "rocksh> ";
+
+static void process_cmd(const char* cmd) {
+    size_t cmd_len = strlen(cmd);
+    if (cmd_len < 1) {
+        return;
+    }
+
+    if (strcmp(cmd, "exit") == 0) {
+        printf("bye!\n");
+        exit(0);
+    }
+
+    printf("command not recognized: %s\n", cmd);
+}
+
+int main(int argc, char *argv[]) {
+    (void)argc;
+    (void)argv;
+
+    char cmd[128];
+    size_t p = 0;
+    
+    printf("%s", shell_prompt);
+
+    while (1) {
+        char c = getchar();
+        printf("%c", c);
+        if (c != '\n') {
+            cmd[p++] = c;
+            continue;
+        }
+
+        cmd[p] = 0;
+        process_cmd(cmd);
+        memset(cmd, 0, 128);
+        p = 0;
+        printf("%s", shell_prompt);
+    }
+    
+    return 0;
+}

programs/rocksh/makefile

@@ -0,0 +1,23 @@
+CC = i686-elf-gcc
+LD = i686-elf-ld
+
+CFLAGS = -ffreestanding -O2 -Wall -Wextra -I../../rocklibc/include
+LDFLAGS = -m elf_i386 -nostdlib
+
+TARGET = rocksh.elf
+
+all: $(TARGET)
+
+crt0.o: crt0.S
+	$(CC) $(CFLAGS) -c crt0.S -o crt0.o
+
+main.o: main.c
+	$(CC) $(CFLAGS) -c main.c -o main.o
+
+$(TARGET): crt0.o main.o ../lib/rlibc.a
+	$(LD) $(LDFLAGS) -T linker.ld crt0.o main.o ../lib/rlibc.a -o $(TARGET)
+
+clean:
+	rm -f *.o $(TARGET)
+
+.PHONY: all clean test