assembly - Stack allocations with a negative offset in a recursive function of more than 4 parameters -

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okay, have function takes 5 arguments passed main.

$a0-$a3 , $t0

# prologue: set stack , frame poiters search      addiu   $sp, $sp, -28           # allocate stack space -- 28 needed here     sw      $fp, 0($sp)             # save caller's frame pointer      sw      $ra, 4($sp)             # save return address     addi    $fp, $sp, 24            # setup search frame pointer  # preserve $a register arguments     sw      $a0, 0($sp)     # addr of element in array     sw      $a1, 4($sp)     # searchvalue     sw      $a2, 8($sp)     # indexleft     sw      $a3, 12($sp)    # indexright      # 5th argument     lw      $s5, 44($sp)    # level = 28 + 16

i how works. however, main doesn't store $t0 in 16($sp). instead stores $t0 in -4($sp).

what mean? set offset in order load value stored $t0 onto stack $s5 register? i'm leaning towards 24($sp) (28 + (-4)) i'm not sure.

this recursive function, want make sure each register loads proper values every time function calls , allocates 28 bytes stack pointer.

and far actual recursive call, don't understand how use $v0? if explain how used, appreciate it


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