gcc/boehm-gc/alpha_mach_dep.s

# This is BROKEN on a 21264 running gcc, and probably in other cases.
# The compiler may spill pointers to fp registers, and this code doesn't
# scan those.

# define call_push(x)    						\
	lda   $16, 0(x);    	/* copy x to first argument register */	\
	jsr   $26, GC_push_one; /* call GC_push_one, ret addr in $26 */	\
	ldgp  $gp, 0($26)	/* restore $gp register from $ra */
	
        .text
        .align  4
        .globl  GC_push_regs
        .ent    GC_push_regs 2
GC_push_regs:
	ldgp    $gp, 0($27)		# set gp from the procedure value reg
	lda     $sp, -32($sp)		# make stack frame
	stq     $26, 8($sp)		# save return address
        .mask   0x04000000, -8
        .frame  $sp, 16, $26, 0

 #      call_push($0)    # expression eval and int func result

 #      call_push($1)    # temp regs - not preserved cross calls
 #      call_push($2)
 #      call_push($3)
 #      call_push($4)
 #      call_push($5)
 #      call_push($6)
 #      call_push($7)
 #      call_push($8)

        call_push($9)    # Saved regs
        call_push($10)
        call_push($11)
        call_push($12)
        call_push($13)
        call_push($14)

        call_push($15)   # frame ptr or saved reg

 #      call_push($16)   # argument regs - not preserved cross calls
 #      call_push($17)
 #      call_push($18)
 #      call_push($19)
 #      call_push($20)
 #      call_push($21)

 #      call_push($22)   # temp regs - not preserved cross calls
 #      call_push($23)
 #      call_push($24)
 #      call_push($25)

 #      call_push($26)   # return address - expression eval
 #      call_push($27)   # procedure value or temporary reg
 #      call_push($28)   # assembler temp - not presrved
        call_push($29)   # Global Pointer
 #      call_push($30)   # Stack Pointer

	ldq     $26, 8($sp)		# restore return address
	lda     $sp, 32($sp)		# pop stack frame
	ret     $31, ($26), 1		# return ($31 == hardwired zero)
	.end    GC_push_regs