fixes

stages/hex1/elf.asm

@@ -36,15 +36,15 @@ fsize:
     mov rax, [rsi + 48] ; st_size
     ret
 
-;; rdi: dst
+;; rdi: src
-;; rsi: src
+;; rsi: dst
 ;; rdx: len
 memcpy:
     .memcpy_loop:
     test rdx, rdx
     jz .memcpy_done
-    mov al, byte [rsi]
+    mov al, byte [rdi]
-    mov byte [rdi], al
+    mov byte [rsi], al
     inc rsi
     inc rdi
     dec rdx
@@ -62,6 +62,7 @@ memcpy:
 ;; +0x1010 argc: u32
 ;; +0x1018 argv: *const *const u8
 
+global _start
 _start:
     mov eax, dword [rsp]        ; argc
     lea rbx, [rsp + 8]          ; argv
@@ -98,7 +99,7 @@ _start:
 
 ;; copy program header to scratch space
     mov rdi, 0x400040            
-    mov rsi, [r15 + 0x40]
+    lea rsi, [r15 + 0x40]
     mov rdx, 0x38              
     call memcpy
 
@@ -110,6 +111,7 @@ _start:
 
 ;; write e_entry to point at 0x40 + 0x38 + in_size - 5
     sub rax, 5
+    add rax, 0x400000
     mov dword [r15 + 24], eax ; write e_entry
 
 ;; write Ehdr and Phdr to output file

stages/hex1/elf.in

@@ -20,8 +20,8 @@
 3e 00
 ; e_version: u32 = EV_CURRENT
 01 00 00 00
-; e_entry: u64 = 0x400078
+; e_entry: u64 = 0x400078 + 0x5c
-78 00 40 00 00 00 00 00
+d4 00 40 00 00 00 00 00
 ; e_phoff: u64 = 0x40
 40 00 00 00 00 00 00 00
 ; e_shoff: u64 = 0x0
@@ -54,9 +54,9 @@
 ; p_paddr: u64 = 0x0
 00 00 00 00 00 00 00 00
 ; p_filesz: u64 = 0x167
-67 01 00 00 00 00 00 00
+ef 01 00 00 00 00 00 00
 ; p_memsz: u64 = 0x167
-67 01 00 00 00 00 00 00
+ef 01 00 00 00 00 00 00
 ; p_align: u64 = 0x1000
 00 10 00 00 00 00 00 00
 ; End of program header
@@ -118,16 +118,16 @@ e8 f1 ff ff ff
 48 8b 46 30
 ;  ret
 c3
-
+;
 ; @memcpy:
 ;  test rdx, rdx
 48 85 d2
 ;  jz 'memcpy_exit
 74 0f
-;  mov al, byte [rsi]
+;  mov al, byte [rdi]
-8a 06
+8a 07
-;  mov byte [rdi], al
+;  mov byte [rsi], al
-88 07
+88 06
 ;  inc rsi
 48 ff c6
 ;  inc rdi
@@ -199,8 +199,8 @@ e8 6b ff ff ff
 ;
 ;  mov edi, 0x400040
 bf 40 00 40 00
-;  mov rsi, [r15+0x40]
+;  lea rsi, [r15+0x40]
-49 8b 77 40
+49 8d 77 40
 ;  mov edx, 0x38 (size)
 ba 38 00 00 00
 ;  call 'memcpy
@@ -217,6 +217,8 @@ b8 78 00 00 00
 ;
 ;  sub rax, 5
 48 83 e8 05
+; add rax, 0x400000
+48 05 00 00 40 00
 ;  mov dword [r15+0x18], eax (store file end - 5)
 41 89 47 18
 ;
@@ -244,7 +246,7 @@ b8 00 00 00 00
 ;  test rax, rax
 48 85 c0
 ;  jle 'die
-0f 8e c0 fe ff ff
+0f 8e ba fe ff ff
 ;
 ;  mov dword [r15+0x1000], eax (store bytes read)
 41 89 87 00 10 00 00
@@ -263,4 +265,5 @@ b8 01 00 00 00
 ;  jz 'write_loop
 74 b5
 ;  call 'die
-e8 8f fe ff ff
+e8 89 fe ff ff
+; end

stages/hex1/hex1.in

@@ -200,7 +200,7 @@ e8 d8 ff ff ff
 ;  jnz 'skip_line_read (+414)
 0f 85 f3 ff ff ff
 ;  call 'rd_buf (+419)
-e8 cd ff ff ff
+e8 cb ff ff ff
 ;  ret
 c3
 ;
@@ -400,7 +400,7 @@ e9 cf ff ff ff
 ;  lea rdi, [r15+0x6004]
 49 8d bf 04 60 00 00
 ;  call 'push_lbl (+770)
-e8 3d fd ff ff
+e8 3b fd ff ff
 ;  ret
 c3
 ; @not_label: (+771)
@@ -463,3 +463,6 @@ e8 57 fe ff ff
 e8 80 ff ff ff
 ;  jmp 'main_loop (+910)
 e9 ec ff ff ff
+; jmp 'main
+e9 a2 ff ff ff
+; end