initHEADmaster

1 files changed, 50 insertions, 0 deletions

diff --git a/src/mylloc.s b/src/mylloc.s
new file mode 100644
index 0000000..9657b73
--- /dev/null
+++ b/src/mylloc.s
@@ -0,0 +1,50 @@
+;;# struct block {
+;;#     void *addr; // pointer to the start address of the block
+;;#     u32 size;   // the size of the block
+;;#     void *next  // pointer to the previous block
+;;# };
+#    
+#;; .section .data
+#
+#;; ;;;# Constants
+#;; .equ SYS_BRK, 214
+#;; .equ BLOCK_SZ, 12
+#;; .equ BLOCK_ARR_CAP, 1024
+#    
+#;; .section .bss
+#    
+#;; system_break_start: 
+#;;     .space 4
+#;; system_break_cur:
+#;;     .space 4
+#
+#;; block_root: 
+#;;     .space BLOCK_SZ
+#;; block_arr:
+#;;     .space BLOCK_SZ * BLOCK_ARR_CAP
+#    
+#;; .section .text
+#
+#;; .globl malloc
+#;; .globl free
+#    
+#;; malloc:
+#;;     mv t6, a0                   ;# save the arg
+#    
+#;;     la t1, system_break_start   ;# load the break
+#;;     la t2, system_break_cur     ;# 
+#;;     lw a0, 0(t1)                ;# has the break been initialized 
+#;;     bnez a0, block_loop         ;# 
+#
+#;;     li a7, SYS_BRK              ;# do brk syscall with an invalid arg
+#;;     ecall                       ;#   to get the current break
+#
+#;;     sw a0 0(t1)                 ;# save the break
+#;;     sw a0 0(t2)                 ;#
+#    
+#;; block_loop:                     ;# in this loop find the first free address
+#
+#;;     ret
+#;; free:
+#;;     ret
+#