From 8cada4d83d84e0966436ca046662a493b6d1dbb3 Mon Sep 17 00:00:00 2001 From: lifehackerhansol Date: Wed, 30 Oct 2024 20:30:10 -0700 Subject: [PATCH] arm7: load directly to IWRAM and only IWRAM Small modification to the linkerscript to stay in 0x03800000. This may break a few loaders but that's okay, nobody should be booting this directly. --- arm7/Makefile | 2 +- arm7/ds_arm7_iwram.ld | 192 +++++++++++++++++++++++++++++++++++++++ arm7/ds_arm7_iwram.specs | 7 ++ 3 files changed, 200 insertions(+), 1 deletion(-) create mode 100644 arm7/ds_arm7_iwram.ld create mode 100644 arm7/ds_arm7_iwram.specs diff --git a/arm7/Makefile b/arm7/Makefile index 4ec84b7..1499d7a 100644 --- a/arm7/Makefile +++ b/arm7/Makefile @@ -28,7 +28,7 @@ CFLAGS := -g -Wall -O3\ $(ARCH) $(INCLUDE) -DARM7 CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions ASFLAGS := -g $(ARCH) -LDFLAGS = -specs=ds_arm7.specs -g $(ARCH) -Wl,--nmagic -Wl,-Map,$(notdir $*).map +LDFLAGS = -specs=../ds_arm7_iwram.specs -g $(ARCH) -Wl,--nmagic -Wl,-Map,$(notdir $*).map LIBS := -ldswifi7 -lmm7 -lnds7 diff --git a/arm7/ds_arm7_iwram.ld b/arm7/ds_arm7_iwram.ld new file mode 100644 index 0000000..159227c --- /dev/null +++ b/arm7/ds_arm7_iwram.ld @@ -0,0 +1,192 @@ +/*-------------------------------------------------------------------------------- + This Source Code Form is subject to the terms of the Mozilla Public License, + v. 2.0. If a copy of the MPL was not distributed with this file, You can + obtain one at https://mozilla.org/MPL/2.0/. +--------------------------------------------------------------------------------*/ +OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm") +OUTPUT_ARCH(arm) +ENTRY(_start) + +MEMORY { + + rom : ORIGIN = 0x08000000, LENGTH = 32M + iwram : ORIGIN = 0x03800000, LENGTH = 64K +} + +__iwram_start = ORIGIN(iwram); +__iwram_top = ORIGIN(iwram)+ LENGTH(iwram); + +__sp_irq = __iwram_top - 0x100; +__sp_svc = __sp_irq - 0x100; +__sp_usr = __sp_svc - 0x100; + +__irq_flags = 0x04000000 - 8; +__irq_flagsaux = 0x04000000 - 0x40; +__irq_vector = 0x04000000 - 4; + +SECTIONS +{ + .crt0 : + { + __text_start = . ; + KEEP (*(.crt0)) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + + .init : + { + KEEP (*(SORT_NONE(.init))) + } >iwram = 0xff + + .plt : { *(.plt) } >iwram = 0xff + + .text : /* ALIGN (4): */ + { + *(.text .stub .text.* .gnu.linkonce.t.*) + KEEP (*(.text.*personality*)) + /* .gnu.warning sections are handled specially by elf32.em. */ + *(.gnu.warning) + *(.glue_7t) *(.glue_7) *(.vfp11_veneer) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + + .fini : + { + KEEP (*(.fini)) + } >iwram =0xff + + __text_end = . ; + + .rodata : + { + *(.rodata) + *all.rodata*(*) + *(.roda) + *(.rodata.*) + *(.gnu.linkonce.r*) + SORT(CONSTRUCTORS) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + + .ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >iwram + __exidx_start = .; + .ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } >iwram + __exidx_end = .; + +/* Ensure the __preinit_array_start label is properly aligned. We + could instead move the label definition inside the section, but + the linker would then create the section even if it turns out to + be empty, which isn't pretty. */ + . = ALIGN(32 / 8); + PROVIDE (__preinit_array_start = .); + .preinit_array : { KEEP (*(.preinit_array)) } >iwram = 0xff + PROVIDE (__preinit_array_end = .); + PROVIDE (__init_array_start = .); + .init_array : { KEEP (*(.init_array)) } >iwram = 0xff + PROVIDE (__init_array_end = .); + PROVIDE (__fini_array_start = .); + .fini_array : { KEEP (*(.fini_array)) } >iwram = 0xff + PROVIDE (__fini_array_end = .); + + .ctors : + { + /* gcc uses crtbegin.o to find the start of the constructors, so + we make sure it is first. Because this is a wildcard, it + doesn't matter if the user does not actually link against + crtbegin.o; the linker won't look for a file to match a + wildcard. The wildcard also means that it doesn't matter which + directory crtbegin.o is in. */ + KEEP (*crtbegin.o(.ctors)) + KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors)) + KEEP (*(SORT(.ctors.*))) + KEEP (*(.ctors)) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + + .dtors : + { + KEEP (*crtbegin.o(.dtors)) + KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors)) + KEEP (*(SORT(.dtors.*))) + KEEP (*(.dtors)) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + + .eh_frame : + { + KEEP (*(.eh_frame)) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + + .gcc_except_table : + { + *(.gcc_except_table) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + } >iwram = 0xff + .jcr : { KEEP (*(.jcr)) } >iwram = 0 + .got : { *(.got.plt) *(.got) } >iwram = 0 + + + .data ALIGN(4) : { + __data_start = ABSOLUTE(.); + *(.data) + *(.data.*) + *(.gnu.linkonce.d*) + CONSTRUCTORS + . = ALIGN(4); + __data_end = ABSOLUTE(.) ; + } >iwram = 0xff + + + __arm7_end__ = .; + + + .bss ALIGN(4) : + { + __bss_start = ABSOLUTE(.); + __bss_start__ = ABSOLUTE(.); + *(.dynbss) + *(.gnu.linkonce.b*) + *(.bss*) + *(COMMON) + . = ALIGN(4); /* REQUIRED. LD is flaky without it. */ + __bss_end__ = ABSOLUTE(.); + __end__ = ABSOLUTE(.); + } >iwram + + /* Stabs debugging sections. */ + .stab 0 : { *(.stab) } + .stabstr 0 : { *(.stabstr) } + .stab.excl 0 : { *(.stab.excl) } + .stab.exclstr 0 : { *(.stab.exclstr) } + .stab.index 0 : { *(.stab.index) } + .stab.indexstr 0 : { *(.stab.indexstr) } + .comment 0 : { *(.comment) } + /* DWARF debug sections. + Symbols in the DWARF debugging sections are relative to the beginning + of the section so we begin them at 0. */ + /* DWARF 1 */ + .debug 0 : { *(.debug) } + .line 0 : { *(.line) } + /* GNU DWARF 1 extensions */ + .debug_srcinfo 0 : { *(.debug_srcinfo) } + .debug_sfnames 0 : { *(.debug_sfnames) } + /* DWARF 1.1 and DWARF 2 */ + .debug_aranges 0 : { *(.debug_aranges) } + .debug_pubnames 0 : { *(.debug_pubnames) } + /* DWARF 2 */ + .debug_info 0 : { *(.debug_info) } + .debug_abbrev 0 : { *(.debug_abbrev) } + .debug_line 0 : { *(.debug_line) } + .debug_frame 0 : { *(.debug_frame) } + .debug_str 0 : { *(.debug_str) } + .debug_loc 0 : { *(.debug_loc) } + .debug_macinfo 0 : { *(.debug_macinfo) } + /* SGI/MIPS DWARF 2 extensions */ + .debug_weaknames 0 : { *(.debug_weaknames) } + .debug_funcnames 0 : { *(.debug_funcnames) } + .debug_typenames 0 : { *(.debug_typenames) } + .debug_varnames 0 : { *(.debug_varnames) } + .stack 0x80000 : { _stack = .; *(.stack) } + /* These must appear regardless of . */ +} diff --git a/arm7/ds_arm7_iwram.specs b/arm7/ds_arm7_iwram.specs new file mode 100644 index 0000000..10be2f7 --- /dev/null +++ b/arm7/ds_arm7_iwram.specs @@ -0,0 +1,7 @@ +%include + +*link: ++ -T../ds_arm7_iwram.ld%s --no-warn-rwx-segments + +*startfile: +ds_arm7_vram_crt0%O%s crti%O%s crtbegin%O%s