String literal not working if passed as argument - c

Question

I'm trying to write a bootloader in c and I noticed that string literals only worked if I passed them as a char *.
If it Could help:
when I converted both versions to assembly I found one difference that was only in the working version which is
mov DWORD PTR -8[ebp], eax
push DWORD PTR -8[ebp]
just before calling puts
Here's my code :
asm("jmp main");
void putc(char c) {
asm volatile("mov %%al, %0" :: "a"(c));
asm volatile("mov %ah, 0x0e");
asm volatile("int 0x10");
}
void puts(const char *s) {
while(*s) putc(*s++);
}
void newl() {
char s[] = { 0x0D, 0x0A, 0 };
puts(s);
}
void clear() {
asm volatile("mov ah, 0");
asm volatile("mov al, 0x3");
asm volatile("int 0x10");
}
void __attribute__((optimize("-O0"))) main() {
clear();
char * a = "Hello World";
puts(a); // WORKS
puts("Hello World"); // DOESN'T WORK (DOES NOT WRITE ANYTHING)
newl();
}
LD.LD :
ENTRY(main)
SECTIONS
{
. = 0x7C00;
.text : AT(0x7C00)
{
*(.text);
}
.sig : AT(0x7C00 + 510)
{
SHORT(0xaa55);
}
/DISCARD/ : {
*(.comment)
*(.eh_frame)
}
}
How I compiled:
gcc -m16 -c -ffreestanding -fno-pie -fno-exceptions -masm=intel -s -Os -static -Wall -ffunction-sections -fdata-sections main.cpp -o main.o
ld -m elf_i386 -o main.elf -T ld.ld main.o
objcopy -O binary main.elf main.bin
and I ran it with : qemu-system-x86_64 -fda main.bin
with char * a = "Hello World"; puts(a); :
objdump -h:
Idx Name Size VMA LMA File off Algn
0 .text 00000003 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .data 00000000 00000000 00000000 00000037 2**0
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000037 2**0
ALLOC
3 .rodata 0000000c 00000000 00000000 00000037 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .text.main 00000051 00000000 00000000 00000043 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
5 .text.putc 00000014 00000000 00000000 00000094 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
6 .text.puts 0000002f 00000000 00000000 000000a8 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
7 .text.newl 00000029 00000000 00000000 000000d7 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
8 .text.clear 00000008 00000000 00000000 00000100 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
9 .comment 0000001f 00000000 00000000 00000108 2**0
CONTENTS, READONLY
10 .note.GNU-stack 00000000 00000000 00000000 00000127 2**0
CONTENTS, READONLY
11 .eh_frame 000000b8 00000000 00000000 00000128 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
with puts("Hello World");:
objdump -h:
Idx Name Size VMA LMA File off Algn
0 .text 00000003 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .data 00000000 00000000 00000000 00000037 2**0
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000037 2**0
ALLOC
3 .rodata 0000000c 00000000 00000000 00000037 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .text.main 00000047 00000000 00000000 00000043 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
5 .text.putc 00000014 00000000 00000000 0000008a 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
6 .text.puts 0000002f 00000000 00000000 0000009e 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
7 .text.newl 00000029 00000000 00000000 000000cd 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
8 .text.clear 00000008 00000000 00000000 000000f6 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
9 .comment 0000001f 00000000 00000000 000000fe 2**0
CONTENTS, READONLY
10 .note.GNU-stack 00000000 00000000 00000000 0000011d 2**0
CONTENTS, READONLY
11 .eh_frame 000000b8 00000000 00000000 00000120 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA