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fix(elf): relocation records, DWARF tables and per-architecture frame data

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Assisted-by: GLM 5.3
This commit is contained in:
petrbalvin
2026-09-19 23:49:13 +02:00
parent ebdf14939f
commit f3c8510a58
11 changed files with 1302 additions and 164 deletions
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asm/link.go
+17 -10
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@@ -25,6 +25,10 @@ type Image struct {
Symbols map[string]int // static symbol → byte offset within the image
DataSyms []DataSymbol // GLOBL symbols, in layout order
Externals []string // referenced but undefined symbols, sorted
// SourcePath is the assembled file's path, recorded in the DWARF
// sections in place of a placeholder name. Empty when the image was
// not built from a named file.
SourcePath string
}
// FuncLayout describes one assembled function within an Image.
@@ -81,12 +85,9 @@ func (fl *FuncLayout) LineAt(offset int) int {
return 0
}
// RelocKind Reloc is one static-symbol reference within a function body: the disp32
// field at Off (function-relative) must reach the symbol plus Addend,
// measured from After, the address just past the instruction. An External
// relocation names a symbol no GLOBL in the file defines; the object-file
// emitters carry it into the output's relocation table.
// RelocKind discriminates the type of relocation needed.
// RelocKind discriminates the relocation a static-symbol reference needs;
// the encoders record one per SB reference, and the object-file emitters map
// it to their format's relocation type.
type RelocKind int
const (
@@ -96,7 +97,6 @@ const (
RelRISCVPCRELIType // R_RISCV_PCREL_ITYPE (AUIPC + I-type pair)
RelRISCVPCRELSType // R_RISCV_PCREL_STYPE (AUIPC + S-type pair)
RelRISCVJal // R_RISCV_JAL (J-type call)
RelPCRelAbs // 32-bit absolute (R_RISCV_32)
RelLoong64AddrHi // R_LOONG64_ADDR_HI (pcalau12i)
RelLoong64AddrLo // R_LOONG64_ADDR_LO (addi.d/ld/st)
RelArm64Addr // R_ADDRARM64 (ADRP + ADD pair)
@@ -106,6 +106,13 @@ const (
)
type Reloc struct {
// Off is the function-relative offset of the field the linker patches
// and After the address just past the instruction, the base the
// assembler measures PC-relative displacements from. Name plus
// Addend select the target: the symbol plus the byte offset. An
// External relocation names a symbol no GLOBL in the file defines;
// the object-file emitters carry it into the output's relocation
// table.
Off int
After int
Name string
@@ -150,7 +157,7 @@ func AssembleFile(f *ast.File) (*Image, error) {
}
link := &linkInfo{symbols: known, allowExternal: true}
img := &Image{Symbols: map[string]int{}}
img := &Image{Symbols: map[string]int{}, SourcePath: f.Path}
textOff := map[string]int{}
type asmFunc struct {
name string
@@ -267,7 +274,7 @@ func AssembleFileRISCV(f *ast.File) (*Image, error) {
return nil, err
}
img := &Image{Symbols: map[string]int{}}
img := &Image{Symbols: map[string]int{}, SourcePath: f.Path}
for _, d := range f.Decls {
t, ok := d.(*ast.Text)
if !ok {
@@ -339,7 +346,7 @@ func AssembleFileLOONG64(f *ast.File) (*Image, error) {
return nil, err
}
img := &Image{Symbols: map[string]int{}}
img := &Image{Symbols: map[string]int{}, SourcePath: f.Path}
for _, d := range f.Decls {
t, ok := d.(*ast.Text)
if !ok {