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loader: refactor

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CTCaer 2022-12-19 04:31:54 +02:00
parent c86554e954
commit 24795891ec
3 changed files with 29 additions and 20 deletions
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2
loader/Makefile
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@ -30,7 +30,7 @@ CUSTOMDEFINES := -DBL_MAGIC=$(IPL_MAGIC)
CUSTOMDEFINES += -DBL_VER_MJ=$(BLVERSION_MAJOR) -DBL_VER_MN=$(BLVERSION_MINOR) -DBL_VER_HF=$(BLVERSION_HOTFX) -DBL_RESERVED=$(BLVERSION_RSVD)
#TODO: Considering reinstating some of these when pointer warnings have been fixed.
WARNINGS := -Wall -Wno-array-bounds -Wno-stringop-overflow
WARNINGS := -Wall -Wsign-compare -Wno-array-bounds -Wno-stringop-overflow
ARCH := -march=armv4t -mtune=arm7tdmi -mthumb-interwork
CFLAGS = $(ARCH) -O2 -g -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -std=gnu11 $(WARNINGS) $(CUSTOMDEFINES)

8
loader/link.ld
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@ -15,6 +15,14 @@ SECTIONS {
*(.rodata*);
*(._payload_00);
*(._payload_01);
/*
* To mitigate bad injectors/chainloaders,
* miss-align binary size to account for version info.
* !If version text is not appended, then use ". = ALIGN(4)"!
*/
data_end_ua = .;
. = ((data_end_ua + 0x6 + 4 - 1) & ~(4 - 1)) - 6;
}
__ldr_end = .;
. = ALIGN(0x10);

21
loader/loader.c
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@ -67,29 +67,30 @@ void loader_main()
CLOCK(CLK_RST_CONTROLLER_CLK_SYSTEM_RATE) = 2; // Set HCLK div to 1 and PCLK div to 3.
CLOCK(CLK_RST_CONTROLLER_SCLK_BURST_POLICY) = 0x20003333; // Set SCLK to PLLP_OUT (408MHz).
// Get Loader and Payload size.
// Get Payload size.
u32 payload_size = sizeof(payload_00) + sizeof(payload_01); // Actual payload size.
payload_size += (u32)payload_01 - (u32)payload_00 - sizeof(payload_00); // Add array alignment.
payload_size += (u32)payload_01 - (u32)payload_00 - sizeof(payload_00); // Add compiler alignment.
payload_size = ALIGN(payload_size, 4); // Align size to 4 bytes.
u32 *payload_addr = (u32 *)payload_00;
// Relocate payload to a safer place.
u32 bytes = ALIGN(payload_size, 4) >> 2;
u32 *addr = payload_addr + bytes - 1;
u32 words = payload_size >> 2;
u32 *src = payload_addr + words - 1;
u32 *dst = (u32 *)(IPL_RELOC_TOP - 4);
while (bytes)
while (words)
{
*dst = *addr;
*dst = *src;
src--;
dst--;
addr--;
bytes--;
words--;
}
// Set source address of the first part.
u8 *src_addr = (void *)(IPL_RELOC_TOP - ALIGN(payload_size, 4));
u8 *src_addr = (void *)(IPL_RELOC_TOP - payload_size);
// Uncompress first part.
u32 dst_pos = LZ_Uncompress((const u8 *)src_addr, (u8 *)IPL_LOAD_ADDR, sizeof(payload_00));
// Set source address of the second part. Includes array alignment.
// Set source address of the second part. Includes compiler alignment.
src_addr += (u32)payload_01 - (u32)payload_00;
// Uncompress second part.
LZ_Uncompress((const u8 *)src_addr, (u8 *)IPL_LOAD_ADDR + dst_pos, sizeof(payload_01));