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57 lines (52 loc) · 2.27 KB
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# x86 callee save: bx, di, si, bp, sp
.file "nlr.s"
.text
# uint nlr_push(4(%esp)=nlr_buf_t *nlr)
.globl nlr_push
.type nlr_push, @function
nlr_push:
mov 4(%esp), %edx # load nlr_buf
mov (%esp), %eax # load return %ip
mov %eax, 8(%edx) # store %ip into nlr_buf+8
mov %ebp, 12(%edx) # store %bp into nlr_buf+12
mov %esp, 16(%edx) # store %sp into nlr_buf+16
mov %ebx, 20(%edx) # store %bx into nlr_buf+20
mov %edi, 24(%edx) # store %di into nlr_buf
mov %esi, 28(%edx) # store %si into nlr_buf
mov nlr_top, %eax # load nlr_top
mov %eax, (%edx) # store it
mov %edx, nlr_top # stor new nlr_buf (to make linked list)
xor %eax, %eax # return 0, normal return
ret # return
.size nlr_push, .-nlr_push
# void nlr_pop()
.globl nlr_pop
.type nlr_pop, @function
nlr_pop:
mov nlr_top, %eax # load nlr_top
mov (%eax), %eax # load prev nlr_buf
mov %eax, nlr_top # store nlr_top (to unlink list)
ret # return
.size nlr_pop, .-nlr_pop
# void nlr_jump(4(%esp)=uint val)
.globl nlr_jump
.type nlr_jump, @function
nlr_jump:
mov nlr_top, %edx # load nlr_top
mov 4(%esp), %eax # load return value
mov %eax, 4(%edx) # store return value
mov (%edx), %eax # load prev nlr_top
mov %eax, nlr_top # store nlr_top (to unlink list)
mov 28(%edx), %esi # load saved %si
mov 24(%edx), %edi # load saved %di
mov 20(%edx), %ebx # load saved %bx
mov 16(%edx), %esp # load saved %sp
mov 12(%edx), %ebp # load saved %bp
mov 8(%edx), %eax # load saved %ip
mov %eax, (%esp) # store saved %ip to stack
xor %eax, %eax # clear return register
inc %al # increase to make 1, non-local return
ret # return
.size nlr_jump, .-nlr_jump
.local nlr_top
.comm nlr_top,4,4