Have function tracer save all registers

libc/runtime/ftrace-hook.S

@@ -22,11 +22,15 @@
 ftrace_hook:
 #ifdef __x86_64__
 
+//	We need to save saved registers because we have some functions
+//	like __errno_location which can be called from an inline asm()
+//	statement. It's nice to have the flexibility anyway.
+
 	cmp	$0,__ftrace(%rip)
 	jle	1f
 	push	%rbp
 	mov	%rsp,%rbp
-	push	%rax
+	and	$-16,%rsp
 	push	%rax
 	push	%rdi
 	push	%rsi
@@ -34,7 +38,19 @@ ftrace_hook:
 	push	%rcx
 	push	%r8
 	push	%r9
+	push	%r10
+	push	%r11
+	push	%r12
+	push	%r13
+	push	%r14
+	push	%r15
 	call	ftracer
+	pop	%r15
+	pop	%r14
+	pop	%r13
+	pop	%r12
+	pop	%r11
+	pop	%r10
 	pop	%r9
 	pop	%r8
 	pop	%rcx
@@ -42,30 +58,51 @@ ftrace_hook:
 	pop	%rsi
 	pop	%rdi
 	pop	%rax
-	pop	%rax
-	pop	%rbp
+	leave
 1:	ret
 
 #elif defined(__aarch64__)
 
-	adrp	x9,__ftrace
-	ldr	w9,[x9,#:lo12:__ftrace]
-	cmp	w9,0
+	adrp	x16,__ftrace
+	ldr	w16,[x16,#:lo12:__ftrace]
+	cmp	w16,0
 	ble	1f
-	stp	x29,x30,[sp,-96]!
+	stp	x29,x30,[sp,-256]!
 	mov	x29,sp
+
 	stp	x0,x1,[sp,16]
 	stp	x2,x3,[sp,32]
 	stp	x4,x5,[sp,48]
 	stp	x6,x7,[sp,64]
-	str	x8,[sp,80]
+	stp	x8,x9,[sp,80]
+	stp	x10,x11,[sp,96]
+	stp	x12,x13,[sp,112]
+	stp	x14,x15,[sp,128]
+	str	x19,[sp,160]
+	stp	x20,x21,[sp,176]
+	stp	x22,x23,[sp,192]
+	stp	x24,x25,[sp,208]
+	stp	x26,x27,[sp,224]
+	str	x28,[sp,240]
+
 	bl	ftracer
-	ldr	x8,[sp,80]
-	ldp	x6,x7,[sp,64]
-	ldp	x4,x5,[sp,48]
-	ldp	x2,x3,[sp,32]
+
 	ldp	x0,x1,[sp,16]
-	ldp	x29,x30,[sp],96
+	ldp	x2,x3,[sp,32]
+	ldp	x4,x5,[sp,48]
+	ldp	x6,x7,[sp,64]
+	ldp	x8,x9,[sp,80]
+	ldp	x10,x11,[sp,96]
+	ldp	x12,x13,[sp,112]
+	ldp	x14,x15,[sp,128]
+	ldr	x19,[sp,160]
+	ldp	x20,x21,[sp,176]
+	ldp	x22,x23,[sp,192]
+	ldp	x24,x25,[sp,208]
+	ldp	x26,x27,[sp,224]
+	ldr	x28,[sp,240]
+
+	ldp	x29,x30,[sp],256
 1:	ret
 
 #endif /* __x86_64__ */