FreeCalypso > hg > freecalypso-tools
annotate target-utils/env/crt0.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> |
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date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | e7502631a0f9 |
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1 #include "halt.h" |
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2 |
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3 .text |
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4 .code 32 |
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5 .global _entry |
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6 _entry: |
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7 ldr sp, =stack_bottom |
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Mychaela Falconia <falcon@freecalypso.org>
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8 @ zero bss |
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Mychaela Falconia <falcon@freecalypso.org>
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9 ldr r0, =__bss_start |
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Mychaela Falconia <falcon@freecalypso.org>
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10 ldr r2, =__bss_end |
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11 sub r1, r2, r0 |
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12 bl bzero |
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13 @ C code entry |
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14 bl main |
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15 mov r0, #HALTCODE_MAINEXITED |
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Mychaela Falconia <falcon@freecalypso.org>
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16 .global _exit |
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17 _exit: nop |
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18 1: nop |
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19 b 1b |