From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Sun, 30 May 2021 13:28:09 +0000 (+1000)
Subject: installed SEGV capture
X-Git-Url: https://git.rrq.au/?a=commitdiff_plain;h=6feac19e9a7e003a0f47890bf39a9a8324697e4b;p=rrq%2Frrqforth.git

installed SEGV capture
---

diff --git a/rrqforth.asm b/rrqforth.asm
index f5d6269..dc37774 100644
--- a/rrqforth.asm
+++ b/rrqforth.asm
@@ -106,6 +106,8 @@ DS_TOP:				; The initial rsp
 
 	;segment readable executable
 
+include 'signals.asm'
+
 ;;; At fasm compilation: reset previous_word to make a new word list
 ;;; Words above belong to the SYSTEM wordlist, and the following
 ;;; belong to the FORTH wordlist.
@@ -204,6 +206,8 @@ main:
 	;; Initial rsp points to the arguments block of size (64 bits)
 	;; followed by the argument pointers.
 	mov qword [p_args_DFA],rsp
+	mov rbp,RS_TOP
+	call p_setup_signals_DFA
 	call main_is_verbose
 	mov qword [p_verboseQ_DFA],rdx
 	jmp p_quit_DFA 		; QUIT
@@ -275,7 +279,7 @@ p_quit_ERROR:
 	dq p_tell
 	ENDFORTH
 	mov rbp,RS_TOP		; reset the return stack
-	jmp main
+	jmp p_quit_INITIALIZED
 
 ;;; ========================================
 
diff --git a/signals.asm b/signals.asm
new file mode 100644
index 0000000..cb39df5
--- /dev/null
+++ b/signals.asm
@@ -0,0 +1,39 @@
+;;; Handle some signals
+
+	WORD p_setup_signals,'[p_setup_signals]',dovariable
+	;; Set up signal handling;
+	mov rdi,11
+	mov rsi,sigaction_data
+	mov rdx,0
+	sigsetsize = sigset.end - sigset.start
+	mov r10,sigsetsize
+	mov rax,13
+	syscall
+	ret
+
+signal_handler_SEGV_message:
+	STRING 10,'*** signal SEGV - restarting ***',10
+	
+signal_handler_SEGV:
+	mov rdi,2
+	mov rsi,signal_handler_SEGV_message + 8
+	mov rdx,qword [signal_handler_SEGV_message]
+	mov rax,1
+	syscall
+	jmp p_quit_DFA
+
+signal_handler_SEGV_restorer:
+	mov rax,15
+	syscall
+
+sigaction_data:
+	dq signal_handler_SEGV ; void     (*sa_handler)(int);
+	;dq 0 ; void     (*sa_sigaction)(int, siginfo_t *, void *);
+        dq 0x44000000 ; unsigned long sa_flags
+        dq 0 ;signal_handler_SEGV_restorer ; void     (*sa_restorer)(void);
+sigset.start: ; sigset_t   sa_mask;
+	rept 8 x {
+          db 0 
+	}
+sigset.end:
+