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libsys: make PSEUDO take a bare syscall name

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Rather than having PSEUDO be a list of object files when all consumers
want syscall names or source files, make it a list of bare syscall
names like INTERPOSED (which is built on PSEUDO).

Improve document of variables developers can set.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D44108
This commit is contained in:
Brooks Davis 2024-02-29 19:19:01 +00:00
parent f102db5028
commit 6d3f4dcda2
1 changed files with 27 additions and 15 deletions
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42
lib/libsys/Makefile.sys
View file

@ -1,5 +1,22 @@
# sys sources
# Implement symbols common to libc and libsys.
#
# When dynamically linked, the libc symbols are filtered by the actual
# implementations in libsys. When statically linked, both libc and
# libsys contain full implementations to preserve the API of libc.a.
#
# The following variable are programmer-defined:
#
# MDASM Override the default syscall implementation in MIASM
# (from syscall.mk below). Each entry is a source file
# name (e.g., vfork.S).
# Generally defined in <arch>/Makefile.sys.
# NOASM Don't generate system call stubs. Each entry is an
# object file name (e.g., yeild.o). Don't add more of these.
# PSEUDO Generate _<sys> and __sys_<sys> symbols, but not <sys>.
# Each entry is a bare syscall name (e.g., "clock_gettime").
# INTERPOSED Like PSEUDO, but <sys>.c is added to SRCS.
# Used for syscalls intercepted by the threading library.
#
.PATH: ${LIBSYS_SRCTOP}/${LIBC_ARCH} ${LIBSYS_SRCTOP}
# Include the generated makefile containing the *complete* list
@ -7,11 +24,6 @@
.include "${SRCTOP}/sys/sys/syscall.mk"
# Include machine dependent definitions.
#
# MDASM names override the default syscall names in MIASM.
# NOASM will prevent the default syscall code from being generated.
# PSEUDO generates _<sys>() and __sys_<sys>() symbols, but not <sys>().
#
.include "${LIBSYS_SRCTOP}/${LIBC_ARCH}/Makefile.sys"
.if ${LIBC_ARCH} == "i386" || ${LIBC_ARCH} == "amd64"
.include "${LIBSYS_SRCTOP}/x86/Makefile.sys"
@ -53,11 +65,11 @@ STATICOBJS+= auxv.o
NOASM= yield.o
PSEUDO= \
_clock_gettime.o \
_exit.o \
_getlogin.o \
_gettimeofday.o \
_sched_getcpu.o
clock_gettime \
exit \
getlogin \
gettimeofday \
sched_getcpu
INTERPOSED = \
accept \
@ -101,7 +113,7 @@ INTERPOSED = \
writev
SRCS+= ${INTERPOSED:S/$/.c/}
PSEUDO+= ${INTERPOSED:C/^.*$/_&.o/}
PSEUDO+= ${INTERPOSED}
# Add machine dependent asm sources:
SRCS+=${MDASM}
@ -111,14 +123,14 @@ SRCS+=${MDASM}
# without a trival <sys> symbol (PSEUDO). Add each syscall that satisfies
# these conditions to the ASM list.
.for _asm in ${MIASM}
.if !${MDASM:R:M${_asm:R}} && !${NOASM:R:M${_asm:R}} && !${PSEUDO:R:M_${_asm:R}}
.if !${MDASM:R:M${_asm:R}} && !${NOASM:R:M${_asm:R}} && !${PSEUDO:M${_asm:R}}
ASM+=$(_asm)
.endif
.endfor
SASM= ${ASM:S/.o/.S/}
SPSEUDO= ${PSEUDO:S/.o/.S/}
SPSEUDO= ${PSEUDO:C/^.*$/_&.S/}
SRCS+= ${SASM} ${SPSEUDO}