feat(lint): eleven new rules over directives, data and addressing

Assisted-by: GLM 5.3

docs/man/gasm-lint.1

@@ -1,4 +1,4 @@
-.TH GASM-LINT 1 "2026-09-19" "gasm" "User Commands"
+.TH GASM-LINT 1 "2026-10-01" "gasm" "User Commands"
 .SH NAME
 gasm-lint \- run the static checks over assembly files
 .SH SYNOPSIS
@@ -27,7 +27,11 @@ A jump target names no label in the function.
 Two labels in one function share a name.
 .TP
 .B missing-ret
-The function can fall off its end without a terminator.
+The function has no RET, or has one but can still fall off its end: the
+last instruction is neither RET nor an unconditional branch, so execution
+continues into the next TEXT.  Trailing labels, GC annotations and
+padding are skipped, and traps (INT on amd64, BRK on arm64) count as
+terminators.
 .TP
 .B missing-textflag-include
 TEXT flags are used without including textflag.h.
@@ -56,8 +60,9 @@ FUNCDATA and PCDATA indices are malformed.
 A label no jump reaches.
 .TP
 .B invalid-textflag
-An unknown TEXT or GLOBL flag, reported one flag at a time; numeric flags
-are accepted as textflag.h constants.
+An unknown TEXT or GLOBL flag, or a known one misplaced (NOSPLIT on
+GLOBL, RODATA on TEXT), reported one flag at a time; numeric flags are
+accepted as textflag.h constants.
 .TP
 .B stack-imbalance
 The function does not restore the stack pointer on every path.
@@ -85,6 +90,63 @@ yet (amd64).
 .TP
 .B reserved-register-write
 A write to the register the runtime reserves (arm64 R18).
+.TP
+.B missing-argsize
+A TEXT without NOSPLIT omits the argument area its
+.B //\ function
+signature implies; the object then records ArgsSizeUnknown and go vet
+skips the size check.
+.TP
+.B noframe-frame-size
+The NOFRAME flag against a positive frame size; NOFRAME is the
+zero-frame spelling, and the negative frames of the arm64 BSD syscall
+stubs are exempt.
+.TP
+.B unnamed-fp-reference
+A numeric offset against FP, written
+.IR 0(FP) ;
+the assembler requires
+.IR name+offset(FP) .
+.TP
+.B hardware-sp-addressing
+A negative numeric offset against
+.IR (SP) ,
+which addresses the hardware stack pointer rather than the named
+virtual frame; the runtime's deliberate hardware-SP references all
+carry positive offsets.
+.TP
+.B vex-sse-mixing
+VEX-encoded instructions and legacy SSE on X registers in one function;
+each switch between the encodings pays a transition penalty
+(informational).
+.TP
+.B unnamed-result
+A result slot addressed with the generic
+.I ret
+spelling although the
+.B //\ function
+signature names the result (a hint).
+.TP
+.B data-width
+A DATA width its value cannot take: 1, 2, 4 or 8 for an integer, 4 or 8
+for a float, and the suffix itself is never optional; a string accepts
+any width.
+.TP
+.B data-value-overflow
+An integer initialiser wider than its DATA field; both assemblers
+truncate it silently to the low bytes.
+.TP
+.B data-string-width
+A string initialiser longer than its DATA field; both assemblers reject
+it.
+.TP
+.B data-without-globl
+A DATA initialiser whose symbol has no GLOBL declaration in the file;
+gasm asm requires the pairing, go tool asm sizes the symbol implicitly.
+.TP
+.B data-exceeds-globl
+A DATA initialiser writing past the GLOBL-declared size; go tool asm
+grows the symbol silently, gasm asm rejects the file.
 .SH OPTIONS
 .TP
 .B \-disable \fIcodes\fR