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Fixed missing args to printf. 

Having the actual function prototype for the internal print() function
would be useful...
This commit is contained in:
Johny Mattsson 2016-05-31 18:42:48 +10:00
parent 75dbc59ba9
commit e15dfee13f
1 changed files with 9 additions and 9 deletions
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18
app/user/wrap_printf.s
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@ -44,20 +44,20 @@
.align 4
.literal_position
__wrap_printf:
addi a1, a1, -32 /* get some stack space */
addi a1, a1, -48 /* get some stack space */
s32i a0, a1, 0 /* store a0 at the bottom */
s32i a2, a1, 8 /* copy the formatting string and first few arguments */
s32i a3, a1, 12 /* ...onto the stack in a way that we get a contiguous*/
s32i a4, a1, 16 /* ...array of all arguments to printf, with the */
s32i a5, a1, 20 /* ...formatting string in the first array slot */
s32i a6, a1, 24 /* ... */
s32i a7, a1, 28 /* ... */
s32i a2, a1, 16 /* copy the formatting string and first few arguments */
s32i a3, a1, 20 /* ...onto the stack in a way that we get a struct */
s32i a4, a1, 24 /* ...{ uint32_t reg_args[6]; uint32_t ignore[2]; } */
s32i a5, a1, 28 /* ...with the formatting string in the first array */
s32i a6, a1, 32 /* ...array slot of .reg_args. */
s32i a7, a1, 36 /* ... */
mov a3, a2 /* print() wants the formatting string as arg 2 too */
movi a2, 0 /* and a zero for its first arg */
addi a4, a1, 8 /* third arg is the pointer to the argument array */
addi a4, a1, 16 /* third arg is the pointer to the argument array */
mov a5, a4 /* as is the fourth arg */
movi a6, 4 /* and the fifth arg is 4 (https://xkcd.com/221/ ?) */
call0 print /* do it! */
l32i a0, a1, 0 /* restore return address into a0 */
addi a1, a1, 32 /* release the stack */
addi a1, a1, 48 /* release the stack */
ret /* all done */