From 7025fbcab1fa5fd055782cd89a6802ae8359dc79 Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Sat, 8 Aug 2020 17:31:40 +0900
Subject: [PATCH] libc: Remove brk() and sbrk() syscalls

---
 include/unistd.h |  2 --
 libc/syscall.S   | 30 ------------------------------
 2 files changed, 32 deletions(-)

diff --git a/include/unistd.h b/include/unistd.h
index 5011b68..211d3d7 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -10,7 +10,5 @@ extern pid_t vfork(void);
 extern int execfve(void*, const char**, const char**);
 extern int execeve(void*, size_t, char *const [], char *const []);
 extern unsigned int sleep(unsigned int);
-extern int brk(void*);
-extern void* sbrk(int);
 
 #endif /* _UNISTD_H */
diff --git a/libc/syscall.S b/libc/syscall.S
index d662ea4..832db24 100644
--- a/libc/syscall.S
+++ b/libc/syscall.S
@@ -15,8 +15,6 @@
 	.global vfork
 	.global _exit
 	.global execeve
-	.global brk
-	.global sbrk
 	.global mmap
 	.global munmap
 	.global sigaction
@@ -99,34 +97,6 @@ execeve:
 	popl	%ebx
 	ret
 
-brk:
-        pushl   $0
-        call    sbrk
-
-        /*
-         * The eax register contains the current sbrk, 8(%esp) the desired sbrk.
-         * We have to pass the difference to sbrk() to increase or decrease it.
-         */
-        movl    8(%esp), %edx
-        subl    %eax, %edx
-
-        /* sbrk(8(%esp) - sbrk(0)) */
-        movl    %edx, (%esp)
-        call    sbrk
-
-        addl    $4, %esp
-        ret
-
-sbrk:
-        pushl   %ebx
-
-        movl    $SYS_SBRK, %eax
-        movl    8(%esp), %ebx
-        int	$SYSCALL_POSIX
-
-        popl    %ebx
-        ret
-
 mmap:
         pushl   %ebx
         pushl   %ebp
-- 
2.47.3