From 703af39239b9dbb8a4159cc39fc483e4cc8df1b6 Mon Sep 17 00:00:00 2001 From: mithe24 Date: Mon, 29 Sep 2025 16:53:18 +0200 Subject: chore: Added provided code snippets --- snippets/allocate.s | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 snippets/allocate.s (limited to 'snippets/allocate.s') diff --git a/snippets/allocate.s b/snippets/allocate.s new file mode 100644 index 0000000..ef80957 --- /dev/null +++ b/snippets/allocate.s @@ -0,0 +1,20 @@ +# void *allocate(int n) +# +# A naive memory allocator that simply retrieves some new space from the OS. +# It is not possible to deallocate the memory again. +.globl allocate +.type allocate, @function +allocate: + push %rdi + # 1. Find the current end of the data segment. + movq $12, %rax # brk + xorq %rdi, %rdi # 0 means we retrieve the current end. + syscall + # 2. Add the amount of memory we want to allocate. + pop %rdi # the argument + push %rax # current end, which is where the allocated memory will start + addq %rax, %rdi # compute the new end + movq $12, %rax # brk + syscall + pop %rax # the old end, which is the address of our allocated memory + ret -- cgit v1.2.3-70-g09d2