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add description for alignment check of loadable segments

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c55b8550fa
This commit is contained in:
Alexander Kuleshov 2018-04-01 00:44:19 +06:00
parent e896e56c86
commit 98ba56ad89
1 changed files with 5 additions and 1 deletions
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Booting/linux-bootstrap-5.md
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@ -330,7 +330,7 @@ if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
} }
``` ```
and if it's not valid, it prints an error message and halts. If we got a valid `ELF` file, we go through all program headers from the given `ELF` file and copy all loadable segments with correct address to the output buffer: and if it's not valid, it prints an error message and halts. If we got a valid `ELF` file, we go through all program headers from the given `ELF` file and copy all loadable segments with correct 2 megabytes aligned address to the output buffer:
```C ```C
for (i = 0; i < ehdr.e_phnum; i++) { for (i = 0; i < ehdr.e_phnum; i++) {
@ -338,6 +338,10 @@ and if it's not valid, it prints an error message and halts. If we got a valid `
switch (phdr->p_type) { switch (phdr->p_type) {
case PT_LOAD: case PT_LOAD:
#ifdef CONFIG_X86_64
if ((phdr->p_align % 0x200000) != 0)
error("Alignment of LOAD segment isn't multiple of 2MB");
+#endif
#ifdef CONFIG_RELOCATABLE #ifdef CONFIG_RELOCATABLE
dest = output; dest = output;
dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR); dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);