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hc
2024-09-20 a36159eec6ca17402b0e146b86efaf76568dc353 
 kernel/arch/alpha/kernel/entry.S
....@@ -469,11 +469,13 @@
469469 #ifdef CONFIG_AUDITSYSCALL
470470 	lda     $6, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
471471 	and     $3, $6, $3
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-#endif
473472 	bne     $3, strace
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+#else
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+	blbs    $3, strace		/* check for SYSCALL_TRACE in disguise */
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+#endif
474476 	beq	$4, 1f
475477 	ldq	$27, 0($5)
476
-1:	jsr	$26, ($27), alpha_ni_syscall
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+1:	jsr	$26, ($27), sys_ni_syscall
477479 	ldgp	$gp, 0($26)
478480 	blt	$0, $syscall_error	/* the call failed */
479481 	stq	$0, 0($sp)
....@@ -544,7 +546,7 @@
544546 	.align	4
545547 	.type	work_pending, @function
546548 work_pending:
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-	and	$17, _TIF_NOTIFY_RESUME | _TIF_SIGPENDING, $2
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+	and	$17, _TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL, $2
548550 	bne	$2, $work_notifysig
549551 
550552 $work_resched:
....@@ -587,7 +589,7 @@
587589 	/* get the system call pointer.. */
588590 	lda	$1, NR_SYSCALLS($31)
589591 	lda	$2, sys_call_table
590
-	lda	$27, alpha_ni_syscall
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+	lda	$27, sys_ni_syscall
591593 	cmpult	$0, $1, $1
592594 	s8addq	$0, $2, $2
593595 	beq	$1, 1f
....@@ -791,7 +793,7 @@
791793 
792794 /*
793795  * Special system calls.  Most of these are special in that they either
794
- * have to play switch_stack games or in some way use the pt_regs struct.
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+ * have to play switch_stack games.
795797  */
796798 
797799 .macro	fork_like name
....@@ -812,46 +814,41 @@
812814 fork_like vfork
813815 fork_like clone
814816 
817
+.macro	sigreturn_like name
815818 	.align	4
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-	.globl	sys_sigreturn
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-	.ent	sys_sigreturn
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-sys_sigreturn:
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+	.globl	sys_\name
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+	.ent	sys_\name
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+sys_\name:
819822 	.prologue 0
820823 	lda	$9, ret_from_straced
821824 	cmpult	$26, $9, $9
822825 	lda	$sp, -SWITCH_STACK_SIZE($sp)
823
-	jsr	$26, do_sigreturn
826
+	jsr	$26, do_\name
824827 	bne	$9, 1f
825828 	jsr	$26, syscall_trace_leave
826829 1:	br	$1, undo_switch_stack
827830 	br	ret_from_sys_call
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-.end sys_sigreturn
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+.end sys_\name
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+.endm
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+
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+sigreturn_like sigreturn
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+sigreturn_like rt_sigreturn
829836 
830837 	.align	4
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-	.globl	sys_rt_sigreturn
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-	.ent	sys_rt_sigreturn
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-sys_rt_sigreturn:
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+	.globl	alpha_syscall_zero
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+	.ent	alpha_syscall_zero
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+alpha_syscall_zero:
834841 	.prologue 0
835
-	lda	$9, ret_from_straced
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-	cmpult	$26, $9, $9
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-	lda	$sp, -SWITCH_STACK_SIZE($sp)
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-	jsr	$26, do_rt_sigreturn
839
-	bne	$9, 1f
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-	jsr	$26, syscall_trace_leave
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-1:	br	$1, undo_switch_stack
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-	br	ret_from_sys_call
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-.end sys_rt_sigreturn
844
-
845
-	.align	4
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-	.globl	alpha_ni_syscall
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-	.ent	alpha_ni_syscall
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-alpha_ni_syscall:
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-	.prologue 0
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-	/* Special because it also implements overflow handling via
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-	   syscall number 0.  And if you recall, zero is a special
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-	   trigger for "not an error".  Store large non-zero there.  */
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+	/* Special because it needs to do something opposite to
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+	   force_successful_syscall_return().  We use the saved
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+	   syscall number for that, zero meaning "not an error".
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+	   That works nicely, but for real syscall 0 we need to
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+	   make sure that this logics doesn't get confused.
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+	   Store a non-zero there - -ENOSYS we need in register
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+	   for our return value will do just fine.
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+	  */
853850 	lda	$0, -ENOSYS
854851 	unop
855852 	stq	$0, 0($sp)
856853 	ret
857
-.end alpha_ni_syscall
854
+.end alpha_syscall_zero