danielandClaude Fable 5
778f897f1a
Add build-montauk-toolchain.sh: builds an OS-aware cross GCC/binutils (same versions and prefix as the bare-metal x86_64-elf toolchain) whose x86_64-montauk target links static ET_EXEC binaries against the Montauk libc sysroot with no special flags: 4 KiB max page size for the kernel ELF loader, -mno-red-zone by default, crt1/crti/crtn + -lc from the sysroot, __montauk__ defined. Target patches are checked into toolchain/patches/, the GCC target header into toolchain/files/. sys/types.h now includes <stdint.h> so hosted code (libgcov and friends) sees intptr_t via the stdio include chain. Co-Authored-By: Claude Fable 5 <[email protected]>
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/*
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* montauk.h
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* GCC target definitions for x86_64-montauk userspace
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* Copyright (c) 2026 Daniel Hammer
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*
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* Programs are static, non-PIE ET_EXEC images loaded by the kernel
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* ELF loader (kernel/src/Sched/ElfLoader.cpp) at their linked
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* address. The loader maps 4 KiB pages, so segments must not be
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* aligned to the 2 MiB x86-64 default.
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*/
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#undef TARGET_OS_CPP_BUILTINS
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#define TARGET_OS_CPP_BUILTINS() \
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do { \
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builtin_define("__montauk__"); \
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builtin_define("__MONTAUK__"); \
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builtin_assert("system=montauk"); \
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} while (0)
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/* The userspace build convention is -mno-red-zone everywhere; keep it
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as the target default. A later -mred-zone on the command line still
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overrides this. */
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#undef CC1_SPEC
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#define CC1_SPEC "-mno-red-zone"
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#undef LINK_SPEC
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#define LINK_SPEC \
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"-m elf_x86_64 -z max-page-size=0x1000 %{shared:-shared} %{!shared:-static}"
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/* crt1/crti/crtn come from the Montauk libc (sysroot usr/lib);
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crtbegin/crtend are GCC's. crti/crtn are empty today (the runtime
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does not run global constructors yet) but are kept in the link so
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that enabling them later needs no toolchain change. */
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC "crt1.o%s crti.o%s crtbegin.o%s"
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#undef ENDFILE_SPEC
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#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
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#undef LIB_SPEC
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#define LIB_SPEC "-lc"
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