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gint: remove the need to track filename offset in stage-2 load

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By patching the ELF we insert the filename at a time where the file
format itself already tracks it (through the symbol .stage2_filename).
This commit is contained in:
Lephe 2024-06-05 10:49:13 +02:00
parent da05e89b1c
commit 88eb5413a6
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GPG key ID: 1BBA026E13FC0495
1 changed files with 3 additions and 4 deletions
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7
src/kernel/start.S
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@ -20,8 +20,7 @@ The only subtlety is that the stage-2 loader must know the binary file's path
to load from the filesystem, and HollyHock doesn't (yet) give it to us. We
write the path in the final binary with the fxsdk/scripts/patch_hh2_filename.py
script from the fxSDK. This is fragile (i.e. not renaming-proof), but a start.
Since the header is variable-size, I leave the offset of stage-2 in the binary
at offset 0x06. I could avoid this by patching the ELF, not bin, but I'm lazy.
We find the filename by looking up the .stage2_filename symbol in the ELF.
*/
/* 16-byte header */
@ -33,8 +32,8 @@ _start_header:
mov.l 1f, r0
jmp @r0
nop
/* Offset to hardcoded filename, used to patch binary after linking */
.word .stage2_filename
nop
/* Address of stage-2 */
1: .long _stage2
/* Stage-1 load address at end of RAM (specified in linker script) */