FreeCalypso > hg > freecalypso-tools
annotate target-utils/c139-lldbg/entry.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 .text |
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2 .globl _entry |
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3 _entry: |
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4 .code 16 |
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5 bx pc |
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6 nop |
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7 |
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8 .code 32 |
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9 stmfd sp!, {r0-r12,lr} |
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10 mrs r0, CPSR |
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11 mov r1, sp |
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12 /* supervisor mode, disable all interrupts */ |
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13 msr CPSR_c, #0xd3 |
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14 ldr sp, =stack_bottom |
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15 /* save entry SP and CPSR */ |
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16 ldr r2, =lldbg_entry_cpsr |
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17 str r0, [r2] |
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18 ldr r2, =lldbg_entry_sp |
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19 str r1, [r2] |
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20 b main |