git: bbc0f33b1317 - main - sysent: add a NOLIB modifer to prevent stub generation

The branch main has been updated by brooks:

URL: https://cgit.FreeBSD.org/src/commit/?id=bbc0f33b1317bb922ff3d960216ce7b4af88b8af

commit bbc0f33b1317bb922ff3d960216ce7b4af88b8af
Author:     Brooks Davis <brooks@FreeBSD.org>
AuthorDate: 2024-10-30 22:48:49 +0000
Commit:     Brooks Davis <brooks@FreeBSD.org>
CommitDate: 2024-11-01 15:44:47 +0000

    sysent: add a NOLIB modifer to prevent stub generation
    
    The yield system call has long existed, but never had a stub.  Replace
    the hardcoded checks for it in libsys_h.lua and syscalls_map.lua and
    stop inserting it into MIASM (requiring libsys/Makefile.sys to disable
    the stub).
    
    (This seems like overkill, but I've got another case in CheriBSD so this
    reduces my diff appreciably.)
    
    Reviewed by:    emaste
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/1503
---
 sys/kern/syscalls.master                    | 3 ++-
 sys/tools/syscalls/core/syscall.lua         | 1 +
 sys/tools/syscalls/scripts/libsys_h.lua     | 2 +-
 sys/tools/syscalls/scripts/syscall_mk.lua   | 4 ++--
 sys/tools/syscalls/scripts/syscalls_map.lua | 2 +-
 5 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
index 7a7530697e59..2bbd20b5a5b0 100644
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -46,6 +46,7 @@
 ;	NOPROTO	same as STD except do not create structure or
 ;		function prototype in sys/sysproto.h.  Does add a
 ;		definition to syscall.h besides adding a sysent.
+;	NOLIB	don't create stubs in libc or libsys
 ;	NOTSTATIC syscall is loadable
 ;	SYSMUX	syscall multiplexer.  No prototype, argument struct, or
 ;		handler is declared or used.  Handled in MD syscall code.
@@ -1679,7 +1680,7 @@
 		    _In_opt_ _Contains_ptr_ struct osigevent *sig
 		);
 	}
-321	AUE_NULL	STD|CAPENABLED {
+321	AUE_NULL	STD|CAPENABLED|NOLIB {
 		int yield(void);
 	}
 322	AUE_NULL	OBSOL	thr_sleep
diff --git a/sys/tools/syscalls/core/syscall.lua b/sys/tools/syscalls/core/syscall.lua
index ca96fc160211..e7e3dc3aac33 100644
--- a/sys/tools/syscalls/core/syscall.lua
+++ b/sys/tools/syscalls/core/syscall.lua
@@ -27,6 +27,7 @@ syscall.known_flags = util.set {
 
 	-- flags beyond this point are modifiers
 	"CAPENABLED",
+	"NOLIB",
 	"NOTSTATIC",
 	"SYSMUX",
 }
diff --git a/sys/tools/syscalls/scripts/libsys_h.lua b/sys/tools/syscalls/scripts/libsys_h.lua
index 75627f08750f..91349d5dc870 100755
--- a/sys/tools/syscalls/scripts/libsys_h.lua
+++ b/sys/tools/syscalls/scripts/libsys_h.lua
@@ -31,7 +31,7 @@ function libsys_h.generate(tbl, config, fh)
 
 	local print_decl = function (sc)
 		return sc:native() and not sc.type.NODEF and
-		    not sc.type.SYSMUX and sc.name ~= "yield"
+		    not sc.type.NOLIB and not sc.type.SYSMUX
 	end
 
 	-- Bind the generator to the parameter file.
diff --git a/sys/tools/syscalls/scripts/syscall_mk.lua b/sys/tools/syscalls/scripts/syscall_mk.lua
index 68438ee8d90c..49d3f6f86c20 100755
--- a/sys/tools/syscalls/scripts/syscall_mk.lua
+++ b/sys/tools/syscalls/scripts/syscall_mk.lua
@@ -44,7 +44,7 @@ function syscall_mk.generate(tbl, config, fh)
 	for _, v in pairs(s) do
 		local c = v:compatLevel()
 		idx = idx + 1
-		if v:native() and not v.type.NODEF then
+		if v:native() and not v.type.NODEF and not v.type.NOLIB then
 			if idx >= size then
 				-- At last system call, no backslash.
 				gen:write(string.format("\t%s.o\n", v:symbol()))
@@ -53,7 +53,7 @@ function syscall_mk.generate(tbl, config, fh)
 				gen:write(string.format("\t%s.o \\\n", v:symbol()))
 			end
 		-- Handle compat (everything >= FREEBSD3):
-		elseif c >= 7 and not v.type.NODEF then
+		elseif c >= 7 and not v.type.NODEF and not v.type.NOLIB then
 			if idx >= size then
 				-- At last system call, no backslash.
 				gen:write(string.format("\t%s.o\n", v:symbol()))
diff --git a/sys/tools/syscalls/scripts/syscalls_map.lua b/sys/tools/syscalls/scripts/syscalls_map.lua
index 57bb5e9da93b..023b43052921 100755
--- a/sys/tools/syscalls/scripts/syscalls_map.lua
+++ b/sys/tools/syscalls/scripts/syscalls_map.lua
@@ -38,7 +38,7 @@ function syscalls_map.generate(tbl, config, fh)
 
 	for _, v in pairs(s) do
 		--print("num " .. v.num .. " name " .. v.name)
-		if v:native() and not v.type.NODEF and v.name ~= "yield" then
+		if v:native() and not v.type.NODEF and not v.type.NOLIB then
 			if v.name ~= "exit" and v.name ~= "vfork" then
 				gen:write(string.format("\t_%s;\n", v.name))
 			end