baka.c

// baka.c
// $ make baka && ./baka

char main[] __attribute__((section(".text#")))  = {
  0x48, 0xc7, 0xc0, 0x01, 0x00, 0x00, 0x00, 0x48, 0xc7, 0xc7, 0x01, 0x00, 0x00, 0x00, 0x48, 0x8d,
  0x35, 0x0a, 0x00, 0x00, 0x00, 0x48, 0xc7, 0xc2, 0x0c, 0x00, 0x00, 0x00, 0x0f, 0x05, 0xc3, 0x48,
  0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x62, 0x61, 0x6b, 0x61, 0x0a
};

baka.s

movq $1, %rax
movq $1, %rdi
leaq hellobaka(%rip), %rsi
movq $12, %rdx
syscall
ret
hellobaka: .ascii "Hello, baka\n"

gencode.sh

#!/bin/sh
as baka.s -o baka.o
ld -T linker.ld --oformat binary -o baka.bin baka.o
od -t x1 -An baka.bin | sed 's/.\([a-z0-9]\{2\}\)/0x\1, /g;s/^/  /g;s/ $//g;1{s/^/char main[] __attribute__((section(".text#"))) = {\n/;};${s/,$/\n};/g}'

linker.ld

SECTIONS {
  .text : {
    *(.*)
  }
}