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elf2uf2: determine entry address selected by Boot ROM

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This commit is contained in:
Peter Lawrence 2021-02-16 17:38:21 -06:00 committed by graham sanderson
parent b53b0bac70
commit ef030701c9
1 changed files with 23 additions and 7 deletions
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30
tools/elf2uf2/main.cpp
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@ -46,7 +46,8 @@ static int fail_write_error() {
struct address_range {
enum type {
CONTENTS, // may have contents
CONTENTS_ENTRY, // may have contents *and* allows an entry address
CONTENTS_NO_ENTRY, // may have contents but does NOT allow an entry address
NO_CONTENTS, // must be uninitialized
IGNORE // will be ignored
};
@ -67,13 +68,13 @@ typedef std::vector<address_range> address_ranges;
#define XIP_SRAM_END 0x15004000u
const address_ranges rp2040_address_ranges_flash {
address_range(FLASH_START, FLASH_END, address_range::type::CONTENTS),
address_range(FLASH_START, FLASH_END, address_range::type::CONTENTS_NO_ENTRY),
address_range(MAIN_RAM_START, MAIN_RAM_END, address_range::type::NO_CONTENTS)
};
const address_ranges rp2040_address_ranges_ram {
address_range(MAIN_RAM_START, MAIN_RAM_END, address_range::type::CONTENTS),
address_range(XIP_SRAM_START, XIP_SRAM_END, address_range::type::CONTENTS),
address_range(MAIN_RAM_START, MAIN_RAM_END, address_range::type::CONTENTS_ENTRY),
address_range(XIP_SRAM_START, XIP_SRAM_END, address_range::type::CONTENTS_NO_ENTRY),
address_range(0x00000000u, 0x00004000u, address_range::type::IGNORE) // for now we ignore the bootrom if present
};
@ -153,7 +154,7 @@ int read_and_check_elf32_ph_entries(FILE *in, const elf32_header &eh, const addr
rc = check_address_range(valid_ranges, entry.paddr, entry.vaddr, mapped_size, false, ar);
if (rc) return rc;
// we don't download uninitialized, generally it is BSS and should be zero-ed by crt0.S, or it may be COPY areas which are undefined
if (ar.type != address_range::type::CONTENTS) {
if ( (ar.type != address_range::type::CONTENTS_ENTRY) && (ar.type != address_range::type::CONTENTS_NO_ENTRY) ) {
if (verbose) printf(" ignored\n");
continue;
}
@ -218,7 +219,16 @@ static bool is_address_valid(const address_ranges& valid_ranges, uint32_t addr)
static bool is_address_initialized(const address_ranges& valid_ranges, uint32_t addr) {
for(const auto& range : valid_ranges) {
if (range.from <= addr && range.to > addr) {
return address_range::type::CONTENTS == range.type;
return (address_range::type::CONTENTS_ENTRY == range.type) || (address_range::type::CONTENTS_NO_ENTRY == range.type);
}
}
return false;
}
static bool is_address_entry_capable(const address_ranges& valid_ranges, uint32_t addr) {
for(const auto& range : valid_ranges) {
if (range.from <= addr && range.to > addr) {
return (address_range::type::CONTENTS_ENTRY == range.type);
}
}
return false;
@ -255,7 +265,13 @@ int elf2uf2(FILE *in, FILE *out) {
}
uint page_num = 0;
if (ram_style) {
uint32_t expected_ep = pages.begin()->first | 0x1;
// the Boot ROM cherry-picks the lowest MAIN_RAM address as the entry point; determine what that will be
uint32_t expected_ep = 0xFFFFFFFF;
for(auto& page_entry : pages) {
if (is_address_entry_capable(valid_ranges, page_entry.first) && (page_entry.first < expected_ep)) {
expected_ep = page_entry.first | 0x1;
}
}
if (eh.entry != expected_ep) {
return fail(ERROR_INCOMPATIBLE, "A RAM binary should have an entry point at the beginning: %08x (not %08x)\n", expected_ep, eh.entry);
}