171e66e87a
* feat: relocate riscv isr to iram Previously, the trap vector itself and its immediate callees (`_start_trap` and `_start_trap_rust_hal`) were located in the mapped instruction flash range `0x420..`, increasing cache pressure and adding variable latency to the very beginning of the interrupt/exception service flow. This change places those routines in iram directly: ``` Num: Value Size Type Bind Vis Ndx Name 48177: 40380280 2428 FUNC GLOBAL DEFAULT 6 _start_trap_rust_hal 48197: 40380bfc 54 FUNC GLOBAL DEFAULT 6 _start_trap_rust 48265: 40380200 0 FUNC GLOBAL DEFAULT 6 _vector_table 48349: 40380100 0 NOTYPE GLOBAL DEFAULT 6 default_start_trap 48350: 40380100 0 NOTYPE GLOBAL DEFAULT 6 _start_trap ``` As seen via `readelf -W -s -C ./target/riscv32imc-unknown-none-elf/debug/examples/gpio_interrupt | grep -E _start_trap\|_vector\|Ndx` * feat(riscv): place .trap in RAM This change follows through on relocating the `_vector_table`, `_start_trap`, and `_start_trap_rust` functions for all present build/link modes for the 'c2, 'c3, 'c6, and 'h2. It has been tested by running the `software_interrupts` example for the 'c3 in direct-boot and esp-bootloader contexts, but I wasn't able to identify how to run the `mcu-boot` mode for the 'c3, nor do I have present access to any of the other devices for testing. * docs: Update CHANGELOG.md
114 lines
3.0 KiB
Plaintext
114 lines
3.0 KiB
Plaintext
ENTRY(_start)
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PROVIDE(_stext = ORIGIN(ROTEXT));
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PROVIDE(_stack_start = ORIGIN(RWDATA) + LENGTH(RWDATA));
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PROVIDE(_max_hart_id = 0);
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PROVIDE(_hart_stack_size = 2K);
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PROVIDE(_heap_size = 0);
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PROVIDE(UserSoft = DefaultHandler);
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PROVIDE(SupervisorSoft = DefaultHandler);
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PROVIDE(MachineSoft = DefaultHandler);
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PROVIDE(UserTimer = DefaultHandler);
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PROVIDE(SupervisorTimer = DefaultHandler);
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PROVIDE(MachineTimer = DefaultHandler);
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PROVIDE(UserExternal = DefaultHandler);
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PROVIDE(SupervisorExternal = DefaultHandler);
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PROVIDE(MachineExternal = DefaultHandler);
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PROVIDE(DefaultHandler = DefaultInterruptHandler);
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PROVIDE(ExceptionHandler = DefaultExceptionHandler);
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PROVIDE(__post_init = default_post_init);
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/* A PAC/HAL defined routine that should initialize custom interrupt controller if needed. */
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PROVIDE(_setup_interrupts = default_setup_interrupts);
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/* # Multi-processing hook function
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fn _mp_hook() -> bool;
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This function is called from all the harts and must return true only for one hart,
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which will perform memory initialization. For other harts it must return false
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and implement wake-up in platform-dependent way (e.g. after waiting for a user interrupt).
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*/
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PROVIDE(_mp_hook = default_mp_hook);
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/* # Start trap function override
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By default uses the riscv crates default trap handler
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but by providing the `_start_trap` symbol external crates can override.
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*/
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PROVIDE(_start_trap = default_start_trap);
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/* esp32c2 fixups */
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SECTIONS {
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.text.dummy (NOLOAD) :
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{
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/* This section is intended to make _stext address work */
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. = ABSOLUTE(_stext);
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} > ROTEXT
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}
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INSERT BEFORE .text_init;
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SECTIONS {
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/* These symbols/functions need to be near eachother, group them together at the start of text */
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.text_init _stext : ALIGN(4)
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{
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KEEP(*(.init));
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KEEP(*(.init.rust));
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KEEP(*(.text.abort));
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} > ROTEXT
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}
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INSERT BEFORE .text;
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SECTIONS {
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.trap : ALIGN(4)
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{
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KEEP(*(.trap));
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*(.trap.*);
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} > RWTEXT
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}
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INSERT AFTER .rwtext;
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SECTIONS {
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/**
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* This dummy section represents the .text section but in rodata.
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* Thus, it must have its alignement and (at least) its size.
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*/
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.text_dummy (NOLOAD):
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{
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/* Start at the same alignement constraint than .text */
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. = ALIGN(4);
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/* Create an empty gap as big as .text section */
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. = . + SIZEOF(.text) + SIZEOF(.text_init);
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/* Prepare the alignement of the section above. Few bytes (0x20) must be
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* added for the mapping header. */
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. = ALIGN(0x10000) + 0x20;
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} > RODATA
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}
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INSERT BEFORE .rodata;
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SECTIONS {
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/* similar as text_dummy */
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.rwdata_dummy (NOLOAD) : {
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. = ALIGN(ALIGNOF(.rwtext));
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. = . + SIZEOF(.rwtext);
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. = . + SIZEOF(.rwtext.wifi);
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. = . + SIZEOF(.trap);
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} > RWDATA
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}
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INSERT BEFORE .data;
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/* Must be called __global_pointer$ for linker relaxations to work. */
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PROVIDE(__global_pointer$ = _data_start + 0x800);
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/* end of esp32c2 fixups */
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/* Shared sections - ordering matters */
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INCLUDE "text.x"
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INCLUDE "rodata.x"
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INCLUDE "rwtext.x"
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INCLUDE "rwdata.x"
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/* End of Shared sections */
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INCLUDE "debug.x"
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