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Introduce Overlay Header and LBAs

This commit is contained in:
jaby 2022-12-04 04:55:53 +01:00
parent 8a54e5f1ea
commit 5320eab44d
3 changed files with 31 additions and 0 deletions
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13
include/PSX/Overlay/overlay.hpp Normal file
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@ -0,0 +1,13 @@
#ifndef __JABYENGINE_OVERLAY__H__
#define __JABYENGINE_OVERLAY__H__
#include "../../stdint.h"
typedef struct __attribute__((packed)) {
void (*execute)();
} OverlayHeader;
typedef struct __attribute__((packed)) {
uint16_t lba;
uint16_t size;
} OverlayLBA;
#endif //!__JABYENGINE_OVERLAY__H__

16
include/PSX/Overlay/overlay_declaration.hpp Normal file
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@ -0,0 +1,16 @@
#ifndef __JABYENGINE_OVERLAY_DECLARATION__H__
#define __JABYENGINE_OVERLAY_DECLARATION__H__
// No include here because this header should be included in a namespace and we don't want multiple namespace definitions of OverlayHeader and OverlayLBA
extern const OverlayHeader overlay_header;
extern const OverlayLBA overlay_lba[];
#define __declare_overlay_header(function) \
[[gnu::used]] \
const OverlayHeader __section(".header") overlay_header = {.execute = &function};
#define __declare_overlay_lbas(...) \
[[gnu::used]] \
const OverlayLBA __section(".header.lbas") overlay_lba[] = {__VA_ARGS__};
#endif //!__JABYENGINE_OVERLAY_DECLARATION__H__

2
src/Tools/mkoverlay/src/creator/ldscript.rs
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@ -38,6 +38,8 @@ pub fn write(output: &mut Output, overlay_desc: &Vec<OverlaySlot>) -> Result<(),
writeln!(output, "\t\t.{} {{", section.name)?;
writeln!(output, "\t\t\t__{}_start = .;", section.name)?;
section.file_pattern.iter().try_for_each(|patr| writeln!(output, "\t\t\tKEEP({}(.header))", patr))?;
writeln!(output, "\t\t\t__{}_lbas = .;", section.name)?;
section.file_pattern.iter().try_for_each(|patr| writeln!(output, "\t\t\tKEEP({}(.header.lbas))", patr))?;
writeln!(output, "\t\t\t__{}_ctor = .;", section.name)?;
for section_type in [".text.startup._GLOBAL__*", ".ctors", ".text.*", ".rodata*", ".sdata*", ".data*", ".sbss*", ".bss*"] {