On Tue, 18 Aug 2026 15:23:25 +0200,
Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
> 
> > Date: Tue, 18 Aug 2026 15:18:01 +0200
> > From: "Kirill A. Korinsky" <kirill@korins.ky>
> > 
> > Robert, Sebastien,
> > 
> > BFD aligns nonpaged PT_LOAD segments to their maximum contained section
> > alignment. Do the same for SPARCV9 instead of retaining the 1 MiB maximum
> > page alignment.
> > 
> > This removes roughly 1 MiB of leading padding from ofwboot without changing
> > its load address or memory layout.
> > 
> > Here diff for the base and llvm/22 in ports.
> > 
> > Ok?
> 
> This is questionable.  What problem are you trying to solve?
>

Size for floppy, ramdiskB and so on.

Without it, ramdiskB won't fit.

> > Index: src/gnu/llvm/lld/ELF/Driver.cpp
> > ===================================================================
> > RCS file: /home/cvs/src/gnu/llvm/lld/ELF/Driver.cpp,v
> > diff -u -p -r1.25 Driver.cpp
> > --- src/gnu/llvm/lld/ELF/Driver.cpp	30 Jul 2026 19:28:37 -0000	1.25
> > +++ src/gnu/llvm/lld/ELF/Driver.cpp	18 Aug 2026 13:01:23 -0000
> > @@ -3496,6 +3496,12 @@ template <class ELFT> void LinkerDriver:
> >    // sections are non-aligned (maxPageSize set to 1) but text sections are aligned
> >    // to the target page size.
> >    ctx.arg.textAlignPageSize = ctx.arg.omagic ? getRealMaxPageSize(ctx, args) : ctx.arg.maxPageSize;
> > +#ifdef __OpenBSD__
> > +  // Match BFD -N semantics for SPARCV9: use the maximum contained section
> > +  // alignment for PT_LOAD segments instead of the 1 MiB page alignment.
> > +  if (ctx.arg.omagic && ctx.arg.emachine == EM_SPARCV9)
> > +    ctx.arg.textAlignPageSize = ctx.arg.maxPageSize;
> > +#endif
> >  
> >    ctx.arg.imageBase = getImageBase(ctx, args);
> >  
> > Index: src/gnu/llvm/lld/ELF/Writer.cpp
> > ===================================================================
> > RCS file: /home/cvs/src/gnu/llvm/lld/ELF/Writer.cpp,v
> > diff -u -p -r1.11 Writer.cpp
> > --- src/gnu/llvm/lld/ELF/Writer.cpp	30 Jul 2026 19:28:37 -0000	1.11
> > +++ src/gnu/llvm/lld/ELF/Writer.cpp	18 Aug 2026 13:01:23 -0000
> > @@ -2701,6 +2701,16 @@ template <class ELFT> void Writer<ELFT>:
> >    ctx.out.programHeaders->offset = ctx.out.elfHeader->size;
> >    uint64_t off = ctx.out.elfHeader->size + ctx.out.programHeaders->size;
> >  
> > +#ifdef __OpenBSD__
> > +  // BFD's implicit script reserves 0x200 bytes before fixed-address SPARCV9
> > +  // -N payloads consumed by OpenFirmware.
> > +  if (!ctx.arg.relocatable && ctx.arg.omagic &&
> > +      ctx.arg.emachine == EM_SPARCV9 &&
> > +      ctx.arg.sectionStartMap.count(".text") &&
> > +      !ctx.script->hasSectionsCommand && !ctx.script->hasPhdrsCommands())
> > +    off = std::max<uint64_t>(off, 0x200);
> > +#endif
> > +
> >    PhdrEntry *lastRX = nullptr;
> >    for (Partition &part : ctx.partitions)
> >      for (auto &p : part.phdrs)
> > Index: ports/devel/llvm/22/Makefile
> > ===================================================================
> > RCS file: /home/cvs/ports/devel/llvm/22/Makefile,v
> > diff -u -p -r1.22 Makefile
> > --- ports/devel/llvm/22/Makefile	30 Jul 2026 19:28:03 -0000	1.22
> > +++ ports/devel/llvm/22/Makefile	18 Aug 2026 13:17:33 -0000
> > @@ -2,7 +2,7 @@ LLVM_MAJOR =	22
> >  LLVM_VERSION =	${LLVM_MAJOR}.1.8
> >  LLVM_PKGSPEC =	>=22,<23
> >  
> > -REVISION =	4
> > +REVISION =	5
> >  
> >  SHARED_LIBS +=	LLVM		0.0 \
> >  		LTO		0.0 \
> > Index: ports/devel/llvm/22/patches/patch-lld_ELF_Driver_cpp
> > ===================================================================
> > RCS file: /home/cvs/ports/devel/llvm/22/patches/patch-lld_ELF_Driver_cpp,v
> > diff -u -p -r1.3 patch-lld_ELF_Driver_cpp
> > --- ports/devel/llvm/22/patches/patch-lld_ELF_Driver_cpp	30 Jul 2026 19:28:03 -0000	1.3
> > +++ ports/devel/llvm/22/patches/patch-lld_ELF_Driver_cpp	18 Aug 2026 13:14:56 -0000
> > @@ -169,7 +169,7 @@ Index: lld/ELF/Driver.cpp
> >   // Parses --image-base option.
> >   static std::optional<uint64_t> getImageBase(Ctx &ctx, opt::InputArgList &args) {
> >     // Because we are using `ctx.arg.maxPageSize` here, this function has to be
> > -@@ -3435,6 +3491,11 @@ template <class ELFT> void LinkerDriver::link(opt::Inp
> > +@@ -3435,6 +3491,17 @@ template <class ELFT> void LinkerDriver::link(opt::Inp
> >     // optimizations such as DATA_SEGMENT_ALIGN in linker scripts. LLD's use of it
> >     // is limited to writing trap instructions on the last executable segment.
> >     ctx.arg.commonPageSize = getCommonPageSize(ctx, args);
> > @@ -178,6 +178,12 @@ Index: lld/ELF/Driver.cpp
> >  +  // sections are non-aligned (maxPageSize set to 1) but text sections are aligned
> >  +  // to the target page size.
> >  +  ctx.arg.textAlignPageSize = ctx.arg.omagic ? getRealMaxPageSize(ctx, args) : ctx.arg.maxPageSize;
> > ++#ifdef __OpenBSD__
> > ++  // Match BFD -N semantics for SPARCV9: use the maximum contained section
> > ++  // alignment for PT_LOAD segments instead of the 1 MiB page alignment.
> > ++  if (ctx.arg.omagic && ctx.arg.emachine == EM_SPARCV9)
> > ++    ctx.arg.textAlignPageSize = ctx.arg.maxPageSize;
> > ++#endif
> >   
> >     ctx.arg.imageBase = getImageBase(ctx, args);
> >   
> > Index: ports/devel/llvm/22/patches/patch-lld_ELF_Writer_cpp
> > ===================================================================
> > RCS file: /home/cvs/ports/devel/llvm/22/patches/patch-lld_ELF_Writer_cpp,v
> > diff -u -p -r1.2 patch-lld_ELF_Writer_cpp
> > --- ports/devel/llvm/22/patches/patch-lld_ELF_Writer_cpp	30 Jul 2026 19:28:03 -0000	1.2
> > +++ ports/devel/llvm/22/patches/patch-lld_ELF_Writer_cpp	18 Aug 2026 13:14:56 -0000
> > @@ -183,11 +183,10 @@ Index: lld/ELF/Writer.cpp
> >     if (OutputSection *cmd = findSection(ctx, ".note.gnu.property", partNo))
> >       addHdr(PT_GNU_PROPERTY, PF_R)->add(cmd);
> >   
> > -@@ -2586,6 +2610,31 @@ template <class ELFT> void Writer<ELFT>::fixSectionAli
> > -         };
> > +@@ -2587,6 +2611,31 @@ template <class ELFT> void Writer<ELFT>::fixSectionAli
> >       }
> >     };
> > -+
> > + 
> >  +#ifndef __OpenBSD__
> >  +  // On i386, produce binaries that are compatible with our W^X implementation
> >  +  if (ctx.arg.emachine == EM_386) {
> > @@ -212,6 +211,24 @@ Index: lld/ELF/Writer.cpp
> >  +    }
> >  +  }
> >  +#endif
> > - 
> > ++
> >     for (Partition &part : ctx.partitions) {
> >       prev = nullptr;
> > +     for (auto &p : part.phdrs)
> > +@@ -2651,6 +2700,16 @@ static std::string rangeToString(uint64_t addr, uint64
> > + template <class ELFT> void Writer<ELFT>::assignFileOffsets() {
> > +   ctx.out.programHeaders->offset = ctx.out.elfHeader->size;
> > +   uint64_t off = ctx.out.elfHeader->size + ctx.out.programHeaders->size;
> > ++
> > ++#ifdef __OpenBSD__
> > ++  // BFD's implicit script reserves 0x200 bytes before fixed-address SPARCV9
> > ++  // -N payloads consumed by OpenFirmware.
> > ++  if (!ctx.arg.relocatable && ctx.arg.omagic &&
> > ++      ctx.arg.emachine == EM_SPARCV9 &&
> > ++      ctx.arg.sectionStartMap.count(".text") &&
> > ++      !ctx.script->hasSectionsCommand && !ctx.script->hasPhdrsCommands())
> > ++    off = std::max<uint64_t>(off, 0x200);
> > ++#endif
> > + 
> > +   PhdrEntry *lastRX = nullptr;
> > +   for (Partition &part : ctx.partitions)
> > 
> > 
> > 
> > -- 
> > wbr, Kirill
> > 
> > 

-- 
wbr, Kirill