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cosmopolitan/libc/calls/calls.mk
Justine Tunney 197aa0d465
Implement swapcontext() and makecontext() 
This change introduces support for Linux-style uc_context manipulation
that's fast and works well on all supported OSes and architectures. It
also integrates with the Cosmpolitan runtime which can show backtraces
comprised of multiple stacks and fibers. See the test and example code
for further details. This will be used by Mold once it's been vendored
2023-07-02 09:01:44 -07:00

233 lines
7.1 KiB
Makefile
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#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
#
# SYNOPSIS
#
# System Call Compatibility Layer
#
# DESCRIPTION
#
# This package exports a familiar system call interface that works
# across platforms.
PKGS += LIBC_CALLS
LIBC_CALLS_ARTIFACTS += LIBC_CALLS_A
LIBC_CALLS = $(LIBC_CALLS_A_DEPS) $(LIBC_CALLS_A)
LIBC_CALLS_A = o/$(MODE)/libc/calls/syscalls.a
LIBC_CALLS_A_FILES := \
$(wildcard libc/calls/typedef/*) \
$(wildcard libc/calls/struct/*) \
$(wildcard libc/calls/*)
LIBC_CALLS_A_HDRS = $(filter %.h,$(LIBC_CALLS_A_FILES))
LIBC_CALLS_A_INCS = $(filter %.inc,$(LIBC_CALLS_A_FILES))
LIBC_CALLS_A_SRCS_S = $(filter %.S,$(LIBC_CALLS_A_FILES))
LIBC_CALLS_A_SRCS_C = $(filter %.c,$(LIBC_CALLS_A_FILES))
LIBC_CALLS_A_SRCS = \
$(LIBC_CALLS_A_SRCS_S) \
$(LIBC_CALLS_A_SRCS_C)
LIBC_CALLS_A_OBJS = \
$(LIBC_CALLS_A_SRCS_S:%.S=o/$(MODE)/%.o) \
$(LIBC_CALLS_A_SRCS_C:%.c=o/$(MODE)/%.o)
LIBC_CALLS_A_CHECKS = \
$(LIBC_CALLS_A).pkg \
$(LIBC_CALLS_A_HDRS:%=o/$(MODE)/%.ok)
LIBC_CALLS_A_DIRECTDEPS = \
LIBC_FMT \
LIBC_INTRIN \
LIBC_NEXGEN32E \
LIBC_NT_ADVAPI32 \
LIBC_NT_IPHLPAPI \
LIBC_NT_KERNEL32 \
LIBC_NT_NTDLL \
LIBC_NT_PDH \
LIBC_NT_POWRPROF \
LIBC_NT_PSAPI \
LIBC_NT_WS2_32 \
LIBC_STR \
LIBC_SYSV \
LIBC_SYSV_CALLS \
THIRD_PARTY_COMPILER_RT
LIBC_CALLS_A_DEPS := \
$(call uniq,$(foreach x,$(LIBC_CALLS_A_DIRECTDEPS),$($(x))))
$(LIBC_CALLS_A): \
libc/calls/ \
$(LIBC_CALLS_A).pkg \
$(LIBC_CALLS_A_OBJS)
$(LIBC_CALLS_A).pkg: \
$(LIBC_CALLS_A_OBJS) \
$(foreach x,$(LIBC_CALLS_A_DIRECTDEPS),$($(x)_A).pkg)
# we can't use asan because:
# siginfo_t memory is owned by kernels
o/$(MODE)/libc/calls/siginfo2cosmo.o: private \
COPTS += \
-ffreestanding \
-fno-sanitize=address
# we can't use asan because:
# ucontext_t memory is owned by xnu kernel
o/$(MODE)/libc/calls/sigenter-xnu.o: private \
COPTS += \
-ffreestanding \
-fno-sanitize=address
# we can't use asan because:
# vdso memory is owned by linux kernel
o/$(MODE)/libc/calls/vdsofunc.greg.o: private \
COPTS += \
-ffreestanding \
-fno-sanitize=address
# we can't use asan because:
# ntspawn allocates 128kb of heap memory via win32
o/$(MODE)/libc/calls/ntspawn.o \
o/$(MODE)/libc/calls/mkntcmdline.o \
o/$(MODE)/libc/calls/mkntenvblock.o: private \
COPTS += \
-ffreestanding \
-fno-sanitize=address
# we can't use sanitizers because:
# windows owns the data structure
o/$(MODE)/libc/calls/wincrash.o \
o/$(MODE)/libc/calls/ntcontext2linux.o: private \
COPTS += \
-fno-sanitize=all
ifneq ($(ARCH), aarch64)
# we always want -O3 because:
# it makes the code size smaller too
# we need -mstringop-strategy=loop because:
# privileged code might generate memcpy call
o/$(MODE)/libc/calls/termios2host.o \
o/$(MODE)/libc/calls/sigenter-freebsd.o \
o/$(MODE)/libc/calls/sigenter-netbsd.o \
o/$(MODE)/libc/calls/sigenter-openbsd.o \
o/$(MODE)/libc/calls/sigenter-xnu.o \
o/$(MODE)/libc/calls/ntcontext2linux.o: private \
COPTS += \
-O3 \
-mstringop-strategy=loop
endif
# we must disable static stack safety because:
# these functions use alloca(n)
o/$(MODE)/libc/calls/execl.o \
o/$(MODE)/libc/calls/execle.o \
o/$(MODE)/libc/calls/execlp.o \
o/$(MODE)/libc/calls/execvpe.o \
o/$(MODE)/libc/calls/statfs.o \
o/$(MODE)/libc/calls/fstatfs.o \
o/$(MODE)/libc/calls/execve-sysv.o \
o/$(MODE)/libc/calls/readlinkat-nt.o \
o/$(MODE)/libc/calls/execve-nt.greg.o \
o/$(MODE)/libc/calls/mkntenvblock.o: private \
CPPFLAGS += \
-DSTACK_FRAME_UNLIMITED
# we must segregate codegen because:
# file contains multiple independently linkable apis
o/$(MODE)/libc/calls/ioctl-siocgifconf.o \
o/$(MODE)/libc/calls/ioctl-siocgifconf-nt.o: private \
COPTS += \
-ffunction-sections \
-fdata-sections
# we always want -Os because:
# va_arg codegen is very bloated in default mode
o//libc/calls/open.o \
o//libc/calls/openat.o \
o//libc/calls/prctl.o \
o//libc/calls/ioctl.o \
o//libc/calls/ioctl_default.o \
o//libc/calls/ioctl_fioclex-nt.o \
o//libc/calls/ioctl_fioclex.o \
o//libc/calls/ioctl_siocgifconf-nt.o \
o//libc/calls/ioctl_siocgifconf.o \
o//libc/calls/fcntl.o: private \
CFLAGS += \
-Os
# we always want -Os because:
# it's early runtime mandatory and quite huge without it
o//libc/calls/getcwd.greg.o \
o//libc/calls/getcwd-nt.greg.o \
o//libc/calls/getcwd-xnu.greg.o \
o//libc/calls/statfs2cosmo.o: private \
CFLAGS += \
-Os
# we always want -O2 because:
# division is expensive if not optimized
o/$(MODE)/libc/calls/clock.o \
o/$(MODE)/libc/calls/timespec_tomillis.o \
o/$(MODE)/libc/calls/timespec_tomicros.o \
o/$(MODE)/libc/calls/timespec_totimeval.o \
o/$(MODE)/libc/calls/timespec_fromnanos.o \
o/$(MODE)/libc/calls/timespec_frommillis.o \
o/$(MODE)/libc/calls/timespec_frommicros.o \
o/$(MODE)/libc/calls/timeval_tomillis.o \
o/$(MODE)/libc/calls/timeval_frommillis.o \
o/$(MODE)/libc/calls/timeval_frommicros.o: private \
CFLAGS += \
-O2
# privileged functions
o/$(MODE)/libc/calls/sigenter-freebsd.o \
o/$(MODE)/libc/calls/sigenter-netbsd.o \
o/$(MODE)/libc/calls/sigenter-openbsd.o \
o/$(MODE)/libc/calls/sigenter-linux.o \
o/$(MODE)/libc/calls/sigenter-xnu.o \
o/$(MODE)/libc/calls/pledge-linux.o \
o/$(MODE)/libc/calls/siginfo2cosmo.o: private \
CFLAGS += \
-ffreestanding \
-fno-sanitize=all
o/$(MODE)/libc/calls/pledge-linux.o \
o/$(MODE)/libc/calls/unveil.o: private \
CFLAGS += \
-DSTACK_FRAME_UNLIMITED
ifeq ($(ARCH), aarch64)
o/$(MODE)/libc/calls/sigaction.o: private CFLAGS += -mcmodel=large
o/$(MODE)/libc/calls/getloadavg-nt.o: private CFLAGS += -ffreestanding
endif
# we want -Os because:
# it makes a big difference
# we need pic because:
# so it can be an LD_PRELOAD payload
o/$(MODE)/libc/calls/pledge-linux.o: private \
CFLAGS += \
-Os \
-fPIC
# these assembly files are safe to build on aarch64
o/$(MODE)/libc/calls/getcontext.o: libc/calls/getcontext.S
@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
o/$(MODE)/libc/calls/swapcontext.o: libc/calls/swapcontext.S
@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
o/$(MODE)/libc/calls/tailcontext.o: libc/calls/tailcontext.S
@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
LIBC_CALLS_LIBS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)))
LIBC_CALLS_SRCS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_SRCS))
LIBC_CALLS_HDRS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_HDRS))
LIBC_CALLS_INCS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_INCS))
LIBC_CALLS_BINS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_BINS))
LIBC_CALLS_CHECKS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_CHECKS))
LIBC_CALLS_OBJS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_OBJS))
LIBC_CALLS_TESTS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_TESTS))
.PHONY: o/$(MODE)/libc/calls
o/$(MODE)/libc/calls: $(LIBC_CALLS_CHECKS)
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