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Rewrote crt0, init, and chainloading code

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start.s, init.c, linker.ld and linker.specs are meant
to be re-used by user applications, should they remove the defines
from init.c and the .chainloader* sections from the linker script
This commit is contained in:
TuxSH 2018-05-07 23:32:45 +02:00
parent 699ddfc043
commit e8306361f0
29 changed files with 848 additions and 185 deletions
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32
fusee/fusee-secondary/src/utils.h
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@ -71,9 +71,39 @@ static inline bool check_32bit_additive_overflow(uint32_t a, uint32_t b) {
return __builtin_add_overflow_p(a, b, (uint32_t)0);
}
static inline bool check_32bit_address_loadable(uintptr_t addr) {
/* FWIW the bootROM forbids loading anything between 0x40000000 and 0x40010000, using it for itself... */
return (addr >= 0x40010000u && addr < 0x40040000u) || addr >= 0x80000000u;
}
static inline bool check_32bit_address_range_loadable(uintptr_t addr, size_t size) {
return
__builtin_add_overflow_p(addr, size, (uintptr_t)0) && /* the range doesn't overflow */
check_32bit_address_loadable(addr) && check_32bit_address_loadable(addr + size) && /* bounds are valid */
!(addr >= 0x40010000u && addr + size >= 0x40040000u) /* the range doesn't cross MMIO */
;
}
bool overlaps(uint64_t as, uint64_t ae, uint64_t bs, uint64_t be);
static inline bool overlaps_a(const void *as, const void *ae, const void *bs, const void *be) {
return overlaps((uint64_t)(uintptr_t)as, (uint64_t)(uintptr_t)ae, (uint64_t)(uintptr_t)bs, (uint64_t)(uintptr_t)be);
}
static inline bool check_32bit_address_range_in_program(uintptr_t addr, size_t size) {
extern uint8_t __chainloader_start__[], __chainloader_end__[];
extern uint8_t __stack_bottom__[], __stack_top__[];
extern uint8_t __heap_start__[], __heap_end__[];
extern uint8_t __start__[], __end__[];
uint8_t *start = (uint8_t *)addr, *end = start + size;
return overlaps_a(start, end, __chainloader_start__, __chainloader_end__) ||
overlaps_a(start, end, __stack_bottom__, __stack_top__) ||
overlaps_a(start, end, __heap_start__, __heap_end__) ||
overlaps_a(start, end, __start__, __end__);
}
void panic(uint32_t code);
void generic_panic(void);
void panic_predefined(uint32_t which);
bool overlaps(uint64_t as, uint64_t ae, uint64_t bs, uint64_t be);
#endif