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feat(asm): emit GOOBJ objects that link directly with the Go toolchain

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petrbalvin
2026-07-17 18:57:04 +02:00
parent 900c9772b1
commit 0920edb092
8 changed files with 1075 additions and 31 deletions
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cmd/gasm/main.go
+13 -7
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@@ -28,7 +28,7 @@ import (
// version is the release version, stamped at build time via
// -ldflags "-X main.version=…" (defaulting to the current release).
var version = "0.11.0"
var version = "0.12.0"
func main() {
if len(os.Args) < 2 {
@@ -94,6 +94,7 @@ Examples:
gasm lint go-flac/*.s run static checks over the kernels
gasm asm -o k.bin kern_amd64.s
gasm asm --format elf -o k.o kern_amd64.s
gasm asm --format goobj -p pkg/path -o k.o kern_amd64.s
`, version)
}
@@ -340,7 +341,7 @@ hover, document symbols, diagnostics and semantic-token highlighting.
}
func cmdAsm(args []string) int {
fs := newCommand("asm", "gasm asm [--format raw|elf|macho] [-o out] <file>", `
fs := newCommand("asm", "gasm asm [--format raw|elf|macho|goobj] [-p pkg] [-o out] <file>", `
Assemble FILE (amd64) without the Go toolchain: every TEXT function is
encoded to machine code — scalar, VEX/AVX2 and EVEX/AVX-512 instructions,
FP/SP frame mapping, local labels and file-local static symbols (GLOBL/DATA)
@@ -350,14 +351,16 @@ With -o the output is written to a file instead. The --format flag selects
what is written: raw (the default) concatenates the functions and the data
section into one self-consistent image; elf and macho emit a relocatable
object (.text/.data sections, a symbol table and one PC32 relocation per
static-symbol reference) that links with the system toolchain — references
to symbols no GLOBL in the file defines become undefined external symbols.
static-symbol reference) that links with the system toolchain; goobj emits
the Go toolchain's own object format, which cmd/link consumes directly (it
requires -p, the package path, and the installed Go toolchain).
`)
out := fs.String("o", "", "write the output to this file")
format := fs.String("format", "raw", "output format: raw (concatenated image), elf or macho (relocatable object)")
format := fs.String("format", "raw", "output format: raw (concatenated image), elf, macho or goobj (Go object)")
pkg := fs.String("p", "", "package path for --format goobj (qualifies the exported symbols)")
fs.Parse(args)
if fs.NArg() != 1 {
fmt.Fprintln(os.Stderr, "usage: gasm asm [--format raw|elf|macho] [-o out] <file>")
fmt.Fprintln(os.Stderr, "usage: gasm asm [--format raw|elf|macho|goobj] [-p pkg] [-o out] <file>")
return 2
}
path := fs.Arg(0)
@@ -444,8 +447,11 @@ to symbols no GLOBL in the file defines become undefined external symbols.
case "macho":
obj, err = img.MachOObject()
kind = "Mach-O object"
case "goobj":
obj, err = img.GOObject(*pkg, path)
kind = "Go object"
default:
fmt.Fprintf(os.Stderr, "gasm asm: unknown format %q (want raw, elf or macho)\n", *format)
fmt.Fprintf(os.Stderr, "gasm asm: unknown format %q (want raw, elf, macho or goobj)\n", *format)
return 2
}
if err != nil {