making elf loader zero bss sections

1 files changed, 3 insertions, 0 deletions

diff --git a/src/user/knob/format.c b/src/user/knob/format.c
index 645fb73..593b20c 100644
--- a/src/user/knob/format.c
+++ b/src/user/knob/format.c
@@ -12,6 +12,7 @@ bool try_sntoi(const char *s, uint32_t n, uint32_t *out) {
   return true;
 }
 
+__attribute__ ((access (write_only, 2)))
 void itosz(uint32_t i, char *out) {
   if (!i) {
     *(uint16_t *)out = (uint16_t)'0';
@@ -32,12 +33,14 @@ void itosz(uint32_t i, char *out) {
 
 const char *const hex_digits = "0123456789abcdef";
 
+__attribute__ ((access (write_only, 2)))
 void itosz_h8(uint8_t i, char *out) {
   out[0] = hex_digits[i >> 4];
   out[1] = hex_digits[i & 0xf];
   out[2] = '\0';
 }
 
+__attribute__ ((access (write_only, 2)))
 void itosz_h32(uint32_t i, char *out) {
   for (uint8_t digit = 0; digit < 8; ++digit)
     out[digit] = hex_digits[(i >> (28 - digit * 4)) & 0xf];