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extra/gen_rodata_ld: Add gen_rodata_ld tool.#246
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25 changes: 25 additions & 0 deletionsextra/gen-rodata-ld/README.md
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| ## Rodata Linker Script Generator | ||
| This tool analyzes ELF files and generates linker script fragments for Zephyr | ||
| two-pass linking, separating read-only data sections based on relocations. | ||
| The tool examines `.rodata` sections in a temporary ELF file and generates a linker | ||
| script that places sections with relocations into `.rodata` (copied to RAM by LLEXT) | ||
| and sections without relocations into `.rodata.noreloc` (kept in flash). This | ||
| optimization significantly reduces RAM usage for LLEXT applications. | ||
| ### Getting the tool | ||
| If you have installed the Arduino IDE and the Arduino core for Zephyr, you can | ||
| find the pre-built files in the `.arduino15/packages/arduino/tools/` folder in | ||
| your home directory. You can directly use the tool from there. | ||
| ### Building manually | ||
| To build the tool, you need to have the Go programming language installed; make | ||
| sure you have the `go` command available in your PATH. Then, use the `go build` | ||
| command to build the tool for your platform. | ||
| To build the full set of binaries for all platforms, run the `package_tool.sh` | ||
| script in the parent directory with `../package_tool.sh`, or provide the path | ||
| to this directory as an argument. |
136 changes: 136 additions & 0 deletionsextra/gen-rodata-ld/main.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package main | ||
| import ( | ||
| "debug/elf" | ||
| "flag" | ||
| "fmt" | ||
| "os" | ||
| "sort" | ||
| "strings" | ||
| ) | ||
| func main() { | ||
| flag.Usage = func() { | ||
| fmt.Fprintf(os.Stderr, "Usage: %s <input.elf> [output_script.ld] [link_mode]\n\n", os.Args[0]) | ||
| fmt.Fprintf(os.Stderr, "Analyzes an ELF file and generates a linker script fragment that\n") | ||
| fmt.Fprintf(os.Stderr, "separates .rodata sections into:\n") | ||
| fmt.Fprintf(os.Stderr, " .rodata - sections WITH relocations (copied to RAM)\n") | ||
| fmt.Fprintf(os.Stderr, " .rodata.noreloc - sections WITHOUT relocations (kept in flash)\n") | ||
| fmt.Fprintf(os.Stderr, "\nIf link_mode is 'static', generates an empty linker script.\n") | ||
| } | ||
| flag.Parse() | ||
| if flag.NArg() < 1 { | ||
| flag.Usage() | ||
| os.Exit(1) | ||
| } | ||
| inputFile := flag.Arg(0) | ||
| outputFile := "rodata_split.ld" | ||
| if flag.NArg() >= 2 { | ||
| outputFile = flag.Arg(1) | ||
| } | ||
| linkMode := "dynamic" | ||
| if flag.NArg() >= 3 { | ||
| linkMode = flag.Arg(2) | ||
| } | ||
| fmt.Printf("Generate rodata linker script (mode: %s)\n", linkMode) | ||
| // For static linking, generate empty linker script | ||
| if linkMode == "static" { | ||
| out, err := os.Create(outputFile) | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| defer out.Close() | ||
| fmt.Fprintf(out, "/* Empty linker script for static linking mode */\n") | ||
| fmt.Printf("Generated: %s\n", outputFile) | ||
| return | ||
| } | ||
| f, err := elf.Open(inputFile) | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| defer f.Close() | ||
| // First pass: find all .rodata sections, indexed by section number | ||
| type RodataSection struct { | ||
| Name string | ||
| HasRelocs bool | ||
| } | ||
| rodataSections := make(map[uint32]*RodataSection) | ||
| for i, section := range f.Sections { | ||
| if strings.HasPrefix(section.Name, ".rodata") { | ||
| rodataSections[uint32(i)] = &RodataSection{Name: section.Name} | ||
| } | ||
| } | ||
| // Second pass: mark which rodata sections have relocations | ||
| for _, section := range f.Sections { | ||
| if section.Type == elf.SHT_REL || section.Type == elf.SHT_RELA { | ||
| if rodata, exists := rodataSections[section.Info]; exists { | ||
| rodata.HasRelocs = true | ||
| } | ||
| } | ||
| } | ||
| // Separate and sort | ||
| withRelocs := []string{} | ||
| withoutRelocs := []string{} | ||
| for _, rodata := range rodataSections { | ||
| if rodata.HasRelocs { | ||
| withRelocs = append(withRelocs, rodata.Name) | ||
| } else { | ||
| withoutRelocs = append(withoutRelocs, rodata.Name) | ||
| } | ||
| } | ||
| sort.Strings(withRelocs) | ||
| sort.Strings(withoutRelocs) | ||
| // Generate linker script | ||
| out, err := os.Create(outputFile) | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| defer out.Close() | ||
| // Helper function to print a section | ||
| printSection := func(out *os.File, sectionName string, sections []string) { | ||
| fmt.Fprintf(out, " %s : {\n", sectionName) | ||
| for _, name := range sections { | ||
| fmt.Fprintf(out, " *(%s)\n", name) | ||
| } | ||
| fmt.Fprintf(out, " }\n\n") | ||
| } | ||
| fmt.Fprintf(out, "/* Auto-generated linker script fragment for LLEXT\n") | ||
| fmt.Fprintf(out, " * Separates .rodata sections based on relocation status\n") | ||
| fmt.Fprintf(out, " */\n\n") | ||
| fmt.Fprintf(out, "SECTIONS\n{\n") | ||
| fmt.Fprintf(out, " /* Read-only data WITH relocations - will be copied to RAM by LLEXT */\n") | ||
| printSection(out, ".rodata", withRelocs) | ||
| fmt.Fprintf(out, " /* Read-only data WITHOUT relocations - kept in flash by LLEXT */\n") | ||
| printSection(out, ".rodata.noreloc", withoutRelocs) | ||
| fmt.Fprintf(out, " /* Merge all .rel.rodata.* sections into .rel.rodata */\n") | ||
| printSection(out, ".rel.rodata", []string{".rel.rodata", ".rel.rodata.*"}) | ||
| fmt.Fprintf(out, " /* Merge all .rela.rodata.* sections into .rela.rodata */\n") | ||
| printSection(out, ".rela.rodata", []string{".rela.rodata", ".rela.rodata.*"}) | ||
| fmt.Fprintf(out, "}\n") | ||
| fmt.Printf("Generated: %s\n", outputFile) | ||
| } |
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