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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/elfloong64.go
+49 -3
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@@ -13,6 +13,12 @@ import (
const (
emLOONGARCH = 258 // EM_LOONGARCH
// EF_LOONGARCH_ABI_DOUBLE_FLOAT | EF_LOONGARCH_OBJABI_V1: the flags the
// Go toolchain writes (cmd/link/internal/ld/elf.go: Flags = 0x43 for
// Loong64). System linkers refuse to merge ET_REL objects whose float
// ABI differs, so 0 (soft-float) would make the object unlinkable.
efLarchAbiDoubleObjV1 = 0x43
// LoongArch relocation types (the ELF psABI).
rLarchPCALAHI20 = 71 // R_LARCH_PCALA_HI20 (pcalau12i)
rLarchPCALALO12 = 72 // R_LARCH_PCALA_LO12 (addi.d/ld/st)
@@ -187,9 +193,25 @@ func (img *Image) ELFLOONG64Object() ([]byte, error) {
out = append(out, 0)
}
}
dw := appendDWARFSections(&out, img, "gasm.s", symIdx, dwAlign)
dw := appendDWARFSections(&out, img, dwarfSourceName(img), symIdx, dwAlign, cfiLOONG64)
dwarfStart := 0 // section index of .debug_abbrev, set when DWARF is present
if dw != nil {
nSections += 4
// Five DWARF sections: .debug_abbrev, .debug_info, .debug_line,
// .debug_line_str and .debug_frame (the CIE is unconditional, so
// the frame section is always present), plus the relocation
// sections below when they carry entries.
dwarfStart = nSections
nSections += 5
appendDWARFRelas(&out, dw, rLarchAbs64, dwAlign)
if dw.infoRelaCount > 0 {
nSections++
}
if dw.lineRelaCount > 0 {
nSections++
}
if dw.frameRelaCount > 0 {
nSections++
}
}
align(8)
@@ -218,13 +240,37 @@ func (img *Image) ELFLOONG64Object() ([]byte, error) {
putSh(".rela.text", shtRela, 0, relaOff, 24*len(relas), secSymtab, secText, 8, 24)
}
putSh(".shstrtab", shtStrtab, 0, shstrOff, len(stSections.bytes()), 0, 0, 1, 0)
// DWARF section headers; their indices follow the write order.
if dw != nil {
// secIdx is a running section index: each putSh below emits the
// next header, and the sh_info of a .rela section names the index
// of the section it relocates.
secIdx := dwarfStart
putSh(".debug_abbrev", shtProgbits, 0, dw.abbrevOff, dw.abbrevSize, 0, 0, 1, 0)
secIdx++
putSh(".debug_info", shtProgbits, 0, dw.infoOff, dw.infoSize, 0, 0, 1, 0)
secInfoIdx := secIdx
secIdx++
if dw.infoRelaCount > 0 {
putSh(".rela.debug_info", shtRela, 0, dw.infoRelaOff, 24*dw.infoRelaCount, secSymtab, secInfoIdx, 8, 24)
secIdx++
}
putSh(".debug_line", shtProgbits, 0, dw.lineOff, dw.lineSize, 0, 0, 1, 0)
secLineIdx := secIdx
secIdx++
if dw.lineRelaCount > 0 {
putSh(".rela.debug_line", shtRela, 0, dw.lineRelaOff, 24*dw.lineRelaCount, secSymtab, secLineIdx, 8, 24)
secIdx++
}
putSh(".debug_line_str", shtProgbits, 0, dw.lineStrOff, dw.lineStrSize, 0, 0, 1, 0)
secIdx++
if dw.frameSize > 0 {
putSh(".debug_frame", shtProgbits, 0, dw.frameOff, dw.frameSize, 0, 0, 8, 0)
secFrameIdx := secIdx
secIdx++
if dw.frameRelaCount > 0 {
putSh(".rela.debug_frame", shtRela, 0, dw.frameRelaOff, 24*dw.frameRelaCount, secSymtab, secFrameIdx, 8, 24)
}
}
}
@@ -237,7 +283,7 @@ func (img *Image) ELFLOONG64Object() ([]byte, error) {
le.PutUint64(hdr[24:], 0)
le.PutUint64(hdr[32:], 0)
le.PutUint64(hdr[40:], uint64(shoff))
le.PutUint32(hdr[48:], 0)
le.PutUint32(hdr[48:], efLarchAbiDoubleObjV1)
le.PutUint16(hdr[52:], 64)
le.PutUint16(hdr[54:], 0)
le.PutUint16(hdr[56:], 0)