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Add PICO_CRT0_NEAR_CALLS to indicate that crt0 can call runtimine_init/main/exit etc via near calls (#2452)

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Co-authored-by: will-v-pi <108662275+will-v-pi@users.noreply.github.com>
This commit is contained in:
Graham Sanderson 2025-05-07 08:56:40 -05:00 • committed by GitHub
parent 7cdb8eca57
commit 799225d550
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GPG key ID: B5690EEEBB952194
2 changed files with 25 additions and 7 deletions
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26
src/rp2_common/pico_crt0/crt0.S
View file

@ -15,6 +15,11 @@
#include "boot/picobin.h"
#include "pico/bootrom.h"
// PICO_CONFIG: PICO_CRT0_NEAR_CALLS, Whether calls from crt0 into the binary are near (<16M away) - ignored for PICO_COPY_TO_RAM, default=0, type=bool, group=pico_crt0
#ifndef PICO_CRT0_NEAR_CALLS
#define PICO_CRT0_NEAR_CALLS 0
#endif
#ifdef NDEBUG
#ifndef COLLAPSE_IRQS
#define COLLAPSE_IRQS
@ -377,6 +382,12 @@ _entry_point:
sev
1:
#endif
#if !__ARM_ARCH_6M__
// Make sure stack limit is 0 if we came in thru the debugger; we do not know what it should be
movs r0, #0
msr msplim, r0
#endif
ldr r0, =__vectors
// Vector through our own table (SP, VTOR will not have been set up at
// this point). Same path for debugger entry and bootloader entry.
@ -403,6 +414,9 @@ _enter_vtable_in_r0:
.type _reset_handler,%function
.thumb_func
_reset_handler:
// Note if we entered thru here on core 0, then we should have gone thru bootrom, so SP (and MSPLIM) on Armv8-M
// should already be set
// Only core 0 should run the C runtime startup code; core 1 is normally
// sleeping in the bootrom at this point but check to be sure (e.g. if
// debugger put core 1 at the ELF entry point for some reason)
@ -465,20 +479,20 @@ bss_fill_test:
bne bss_fill_loop
platform_entry: // symbol for stack traces
#if PICO_CRT0_NEAR_CALLS && !PICO_COPY_TO_RAM
bl runtime_init
bl main
bl exit
#else
// Use 32-bit jumps, in case these symbols are moved out of branch range
// (e.g. if main is in SRAM and crt0 in flash)
#if !__ARM_ARCH_6M__
// Make sure stack limit is 0 - the user can set it themselves
// todo probably worth adding to the EXE_DEF in the future
movs r0, #0
msr msplim, r0
#endif
ldr r1, =runtime_init
blx r1
ldr r1, =main
blx r1
ldr r1, =exit
blx r1
#endif
// exit should not return. If it does, hang the core.
1: // separate label because _exit can be moved out of branch range
bkpt #0

6
src/rp2_common/pico_runtime/CMakeLists.txt
View file

@ -68,6 +68,7 @@ endif()
# FPGA_CHECK - checks for FPGA which allows Raspberry Pi to run your binary on FPGA;
# PANIC - default panic impl which brings in stdio;
# AUTO_INIT_MUTEX - auto init mutexes, without this you get no printf mutex either;
# CRT0_FAR_CALLS - use blx not bl for calls from crt0 to user overridable functions;
#
# \param\ INCLUDE The items to include
# \param\ EXCLUDE The items to exclude
@ -148,4 +149,7 @@ function(pico_minimize_runtime TARGET)
if (NOT RUNTIME_INCLUDE_FPGA_CHECK)
target_compile_definitions(${TARGET} PRIVATE PICO_NO_FPGA_CHECK=1)
endif()
endfunction()
if (NOT RUNTIME_CRT0_FAR_CALLS)
target_compile_definitions(${TARGET} PRIVATE PICO_CRT0_NEAR_CALLS=1)
endif()
endfunction()