FreeCalypso > hg > freecalypso-tools
view target-utils/libc/memcpy16.S @ 965:2969032bdfac
fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing
The only 100% safe way to pass a NULL pointer as a function argument
in K&R C is to cast 0 to a pointer type; failing to do so may cause
mysterious bugs (invalid stack frames or garbage in argument registers)
on 64-bit machines. This issue has already been fixed in most of
FC host tools, but I just found some missed spots: passing of NULL UDH
to PDU encoding functions in fcup-smsend[mult] in the case of single
(not concatenated) SMS.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | 8dc062c6359b |
children |
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.text .code 32 .globl memcpy16 memcpy16: 1: subs r2, r2, #2 ldrcsh r3, [r1], #2 strcsh r3, [r0], #2 bhi 1b bx lr