factorize printf into io.h

2 files changed, 6 insertions, 20 deletions

diff --git a/02_process_init/Makefile b/02_process_init/Makefile
index 6e1f512..430b0a9 100644
--- a/02_process_init/Makefile
+++ b/02_process_init/Makefile
@@ -1,18 +1,16 @@
 # Copyright (c) 2020 Johannes Stoelp
 
 show: entry
-	#gdb -q --batch -ex 'starti' -ex 'x/g $$rsp' -ex 'x/s *(char**)($$rsp+8)' ./$^
 	./entry 1 2 3 4
 
 entry: entry.S entry.c
 	gcc -o $@                        \
-	    -I ../include                \
+	    -g -O0                       \
 	    -Wall -Wextra                \
-	    -static                      \
+	    -I ../include                \
 	    -nostartfiles -nodefaultlibs \
-	    -g -O0                       \
+	    -static                      \
 	    $^
 
-
 clean:
 	rm -f entry
diff --git a/02_process_init/entry.c b/02_process_init/entry.c
index a6b0918..360d205 100644
--- a/02_process_init/entry.c
+++ b/02_process_init/entry.c
@@ -1,26 +1,14 @@
 // Copyright (c) 2020 Johannes Stoelp
 
-#include <asm/unistd.h>
 #include <elf.h>
-#include <fmt.h>
-#include <stdint.h>
-#include <syscall.h>
+#define MAX_PRINTF_LEN 128
+#include <io.h>
 
 #if !defined(__linux__) || !defined(__x86_64__)
 #    error "Only supported in linux(x86_64)!"
 #endif
 
-int dynld_printf(const char* fmt, ...) {
-    va_list ap;
-    va_start(ap, fmt);
-    char buf[64];
-    int ret = dynld_vsnprintf(buf, sizeof(buf), fmt, ap);
-    va_end(ap);
-    syscall3(__NR_write, 1 /* stdout */, buf, ret);
-    return ret;
-}
-
-void entry(long* prctx) {
+void entry(const long* prctx) {
     // Interpret data on the stack passed by the OS kernel as specified in the
     // x86_64 SysV ABI.