diff options
Diffstat (limited to 'libgloss/ms1/trap.S')
| -rw-r--r-- | libgloss/ms1/trap.S | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libgloss/ms1/trap.S b/libgloss/ms1/trap.S new file mode 100644 index 0000000..9fca720 --- /dev/null +++ b/libgloss/ms1/trap.S @@ -0,0 +1,34 @@ +;; +;; The errno will be in r5 if r11 is -1. +;; + .text + .global __trap0 +__trap0: + ;; non-leaf function so need to create stack frame to + ;; store ra and fp + subi sp, sp, #16 + stw ra, sp, #12 + or r0, r0, r0 ;; nop + stw fp, sp, #8 + or fp, sp, sp + stw r5, sp, #4 + or r0, r0, r0 ;; nop + stw r6, sp, #0 + addi r6, r0, #$-1 + si r14 + or r0, r0, r0 ;; nop + brne r11, r6, .L0 + ldui r6, #%hi16(errno) + addui r6, r6, #%lo16(errno) + stw r5, r6, #0 + or r0, r0, r0 ;; nop +.L0: + ldw r6, sp, #0 + or r0, r0, r0 ;; nop + ldw r5, sp, #4 + or r0, r0, r0 ;; nop + ldw ra, sp, #12 + or r0, r0, r0 ;; nop + ldw fp, sp, #8 + jal r0, r14 + addi sp, sp, #16 |