6l: PE32+ output for Windows amd64 (-H 10), printing via kernel32#8
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6l: PE32+ output for Windows amd64 (-H 10), printing via kernel32#8rafael2knokia wants to merge 1 commit into
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Wire the PE writer into 6l so it can produce 64-bit Windows executables
that actually do I/O, the amd64 counterpart to the 386 support on 8l.
src/cmd/ld/pe.{c,h}: add the PE32+ path.
- New IMAGE_OPTIONAL_HEADER64 (ImageBase and the stack/heap sizes widen
to 8 bytes, BaseOfData dropped; written verbatim like the 32-bit
header). peinit() already set pe64 for thechar=='6'; asmbpe() now
emits Magic 0x20b, MajorSubsystem/OS 6.0 (64-bit Windows predates
4.0), LARGE_ADDRESS_AWARE, and fills oh64 from oh.
- The import table now imports GetStdHandle, WriteFile and ExitProcess
from kernel32. peimports() (run from dope(), before reloc()) lays out
the .idata section and defines an __imp_<name> linker symbol at each
import's IAT slot, so a program can call through the thunk with
"MOVQ __imp_WriteFile(SB), AX; CALL AX". IAT entries and the null
terminator are 8 bytes wide under pe64.
- add_import_table() now only writes the bytes (layout done earlier),
and writes them at the section's PointerToRawData rather than the
current EOF (with non-empty .data the file position is not
page-aligned, which left the image "truncated").
- dope() skips zero-size .data/.bss: an empty section does not advance
the virtual-address cursor, so the next section would collide on
VirtualAddress and the loader rejects the image.
src/cmd/6l: compile pe.c (symlink + mkfile), add "-H 10" / goos=windows
handling in obj.c (peinit + case 10, defaulting INITTEXT=PEBASE+0x1000
like 8l), call dope() before reloc() so the __imp_* symbols resolve, and
dispatch asmbpe() from asmb(). 6l has no PE symbol-table path yet, so
obj.c forces -s for -H 10.
tests/s/mini: hello_windows_amd64.s prints "Hello, World!" via
GetStdHandle + WriteFile + ExitProcess (Win64 ABI: args in CX/DX/R8/R9,
32-byte shadow space, 16-byte aligned stack), built with 6l -H 10.
Verified on Linux with wine: `6l -s -H 10` produces a
"PE32+ executable (console) x86-64" (Magic 0x20b, ImageBase 0x400000)
that prints "Hello, World!" and exits 0.
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Summary
6l -H 10to emit PE32+ (64-bit) Windows executables that actually do I/O..idataimport table importsGetStdHandle,WriteFileandExitProcessfromkernel32.dll, and the linker defines an__imp_<name>symbol at each import's IAT slot so a program can call through the thunk (MOVQ __imp_WriteFile(SB), AX; CALL AX).tests/s/mini/hello_windows_amd64.sprintsHello, World!and exits 0.Details
IMAGE_OPTIONAL_HEADER64added;asmbpe()emits Magic0x20b, subsystem/OS 6.0,LARGE_ADDRESS_AWARE, fillsoh64fromoh. IAT entries are 8 bytes wide underpe64.peimports()runs fromdope()(moved beforereloc()) to lay out.idataand define the__imp_*symbols so references resolve to the right IAT slots.add_import_table()writes at the section'sPointerToRawData(not EOF), fixing a "file truncated" load error when.datais non-empty.dope()skips zero-size.data/.bssso sections don't collide onVirtualAddress.This PR is now independent of #7 (386 smoke test); both branch from
master.Test plan
6l -s -H 10builds aPE32+ executable (console) x86-64.wine: printsHello, World!, exits 0.8l/5lstill compile the sharedpe.c;mk allintests/s/minipasses.