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本人在keil for arm环境下写的

<BR><BR>[Stack]<UL><LI>Max Depth = 24<LI>Call Chain = exit -> __rt_exit -> __rt_lib_shutdown</UL>
<BR>[Calls]<UL><LI><a href="#[fe2d74]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__rt_exit (via Veneer)
<LI><a href="#[104c8e0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_call_atexit_fns (Weak Reference)
<LI><a href="#[104df34]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_stackcheck (Weak Reference)
</UL>
<BR>[Called By]<UL><LI><a href="#[fe2ebc]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_entry
</UL>

<P><STRONG><a name="[10498a4]"></a>__rt_lib_init</STRONG> (Thumb, 188 bytes, Stack size 40 bytes, lib_init.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 48<LI>Call Chain = __rt_lib_init -> _fp_init</UL>
<BR>[Calls]<UL><LI><a href="#[1042660]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_fp_init (via Veneer)
<LI><a href="#[1045a74]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__rt_locale (via Veneer)
<LI><a href="#[1048e24]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_signal_init (Weak Reference)
<LI><a href="#[1048ea0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_rand_init (Weak Reference)
<LI><a href="#[1048f18]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_initio (Weak Reference)
<LI><a href="#[1048f8c]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_init_user_alloc (Weak Reference)
<LI><a href="#[104900c]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_init_alloc (Weak Reference)
<LI><a href="#[1049084]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_getenv_init (Weak Reference)
<LI><a href="#[1049100]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_get_lc_time (Weak Reference)
<LI><a href="#[104917c]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_get_lc_numeric (Weak Reference)
<LI><a href="#[10491f8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_get_lc_monetary (Weak Reference)
<LI><a href="#[1049278]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_get_lc_ctype (Weak Reference)
<LI><a href="#[10492f4]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_get_lc_collate (Weak Reference)
<LI><a href="#[1049370]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_fp_trap_init (Weak Reference)
<LI><a href="#[10493ec]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_clock_init (Weak Reference)
<LI><a href="#[1049464]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_atexit_init (Weak Reference)
<LI><a href="#[104955c]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__cpp_initialize__aeabi_ (Weak Reference)
<LI><a href="#[10495e4]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__alloca_initialize (Weak Reference)
<LI><a href="#[1049664]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__Heap_DescSize (Weak Reference)
<LI><a href="#[10496e0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_exceptions_init (Weak Reference)
<LI><a href="#[1049970]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_argv_veneer (via Veneer)
<LI><a href="#[104df34]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_stackcheck (Weak Reference)
</UL>
<BR>[Called By]<UL><LI><a href="#[fe2ebc]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_entry (via Veneer)
</UL>

<P><STRONG><a name="[1049854]"></a>__rt_lib_shutdown</STRONG> (Thumb, 26 bytes, Stack size 8 bytes, lib_init.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 8<LI>Call Chain = __rt_lib_shutdown</UL>
<BR>[Calls]<UL><LI><a href="#[1048d24]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_terminateio (Weak Reference)
<LI><a href="#[1048da0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_terminate_user_alloc (Weak Reference)
<LI><a href="#[10494e0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__cxa_finalize (Weak Reference)
<LI><a href="#[104df34]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_stackcheck (Weak Reference)
</UL>
<BR>[Called By]<UL><LI><a href="#[fe2d74]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_exit (via Veneer)
</UL>

<P><STRONG><a name="[104806c]"></a>_platform_post_stackheap_init</STRONG> (ARM, 12 bytes, Stack size 0 bytes, boardinit2.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[fe2ebc]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_entry
</UL>

<P><STRONG><a name="[1047c18]"></a>_platform_post_lib_init</STRONG> (ARM, 16 bytes, Stack size 8 bytes, boardinit3.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 8<LI>Call Chain = _platform_post_lib_init</UL>
<BR>[Called By]<UL><LI><a href="#[fe2ebc]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_entry
</UL>

<P><STRONG><a name="[1046e54]"></a>__ARM_call_via_r0</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046ed4]"></a>__call_via_r0</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046d88]"></a>__ARM_call_via_r1</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[104e0b4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__printf
</UL>

<P><STRONG><a name="[1046dd8]"></a>__call_via_r1</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046cbc]"></a>__ARM_call_via_r2</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[104d188]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_printf_outstr_char
<LI><a href="#[104e0b4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__printf
<LI><a href="#[1050ec8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_printf_int_common
</UL>

<P><STRONG><a name="[1046d0c]"></a>__call_via_r2</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046bf0]"></a>__ARM_call_via_r3</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[104e0b4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__printf
</UL>

<P><STRONG><a name="[1046c40]"></a>__call_via_r3</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046af4]"></a>__ARM_call_via_r4</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046b74]"></a>__call_via_r4</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[10469f8]"></a>__ARM_call_via_r5</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046a78]"></a>__call_via_r5</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[10468fc]"></a>__ARM_call_via_r6</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[104697c]"></a>__call_via_r6</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046800]"></a>__ARM_call_via_r7</STRONG> (Thumb, 2 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1046880]"></a>__call_via_r7</STRONG> (Thumb, 0 bytes, Stack size unknown bytes, callvia.o(.text), UNUSED)

<P><STRONG><a name="[1045a74]"></a>__rt_locale</STRONG> (ARM, 12 bytes, Stack size 0 bytes, rt_locale_intlibspace.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[10498a4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_lib_init (via Veneer)
</UL>

<P><STRONG><a name="[1042f24]"></a>__ARM_get_argv</STRONG> (Thumb, 6 bytes, Stack size 4 bytes, no_argv.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 4<LI>Call Chain = __ARM_get_argv</UL>
<BR>[Address Reference Count : 1]<UL><LI> lib_init.o(.emb_text)
</UL>
<P><STRONG><a name="[10815e8]"></a>__rt_fp_status_addr</STRONG> (ARM, 12 bytes, Stack size 0 bytes, rt_fp_status_addr_intlibspace.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[1042660]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_fp_init
</UL>

<P><STRONG><a name="[fe9cfc]"></a>__aeabi_uidiv</STRONG> (ARM, 0 bytes, Stack size 0 bytes, aeabi_sdiv.o(.text_udiv), UNUSED)

<P><STRONG><a name="[fe9cac]"></a>__aeabi_uidivmod</STRONG> (ARM, 28 bytes, Stack size 0 bytes, aeabi_sdiv.o(.text_udiv))
<BR><BR>[Calls]<UL><LI><a href="#[fe9f8c]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__arm_div_large
<LI><a href="#[fea008]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__arm_div8
<LI><a href="#[fea080]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__arm_div4
</UL>
<BR>[Called By]<UL><LI><a href="#[b242b8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;main
</UL>

<P><STRONG><a name="[104fbf4]"></a>__fpl_dcheck_NaN2</STRONG> (ARM, 12 bytes, Stack size 0 bytes, dcheck.o(x$fpl$dcheck), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1047400]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_return_NaN
</UL>
<BR>[Called By]<UL><LI><a href="#[fe3ab0]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_dmul
<LI><a href="#[fe5f44]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_ddiv
</UL>

<P><STRONG><a name="[104f6dc]"></a>__fpl_dcheck_NaN1</STRONG> (ARM, 12 bytes, Stack size 0 bytes, dcheck1.o(x$fpl$dcheck1), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1047400]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_return_NaN
</UL>
<BR>[Called By]<UL><LI><a href="#[fe4ed4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_dfixu
</UL>

<P><STRONG><a name="[fe5fb8]"></a>__aeabi_ddiv</STRONG> (ARM, 0 bytes, Stack size 16 bytes, ddiv.o(x$fpl$ddiv))
<BR><BR>[Stack]<UL><LI>Max Depth = 16<LI>Call Chain = __aeabi_ddiv</UL>
<BR>[Called By]<UL><LI><a href="#[b242b8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;main
</UL>

<P><STRONG><a name="[fe5f44]"></a>_ddiv</STRONG> (ARM, 464 bytes, Stack size 16 bytes, ddiv.o(x$fpl$ddiv), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[fe5ec8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_ddiv_mantissas
<LI><a href="#[fe60f8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_infinity (Weak Reference)
<LI><a href="#[104fbf4]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_dcheck_NaN2
</UL>

<P><STRONG><a name="[fe607c]"></a>__fpl_inf_ddiv</STRONG> (ARM, 0 bytes, Stack size unknown bytes, ddiv.o(x$fpl$ddiv), UNUSED)

<P><STRONG><a name="[fe5ec8]"></a>_ddiv_mantissas</STRONG> (ARM, 608 bytes, Stack size 28 bytes, ddiv.o(x$fpl$ddiv), UNUSED)
<BR><BR>[Called By]<UL><LI><a href="#[fe5f44]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_ddiv
</UL>

<P><STRONG><a name="[fe4f48]"></a>__aeabi_d2uiz</STRONG> (ARM, 0 bytes, Stack size 8 bytes, dfixu.o(x$fpl$dfixu))
<BR><BR>[Stack]<UL><LI>Max Depth = 8<LI>Call Chain = __aeabi_d2uiz</UL>
<BR>[Called By]<UL><LI><a href="#[b242b8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;main
</UL>

<P><STRONG><a name="[fe4ed4]"></a>_dfixu</STRONG> (ARM, 132 bytes, Stack size 8 bytes, dfixu.o(x$fpl$dfixu), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[fe60f8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_infinity (Weak Reference)
<LI><a href="#[104f6dc]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_dcheck_NaN1
</UL>

<P><STRONG><a name="[fe5018]"></a>__fpl_inf_dfixu</STRONG> (ARM, 0 bytes, Stack size unknown bytes, dfixu.o(x$fpl$dfixu), UNUSED)

<P><STRONG><a name="[fe4350]"></a>__aeabi_i2d</STRONG> (ARM, 0 bytes, Stack size 0 bytes, dflt_noclz.o(x$fpl$dflt), UNUSED)

<P><STRONG><a name="[fe42dc]"></a>_dflt</STRONG> (ARM, 88 bytes, Stack size 0 bytes, dflt_noclz.o(x$fpl$dflt), UNUSED)

<P><STRONG><a name="[fe448c]"></a>__dflt_normalise</STRONG> (ARM, 0 bytes, Stack size unknown bytes, dflt_noclz.o(x$fpl$dflt), UNUSED)
<BR><BR>[Called By]<UL><LI><a href="#[fe43c8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;_dfltu
</UL>

<P><STRONG><a name="[fe443c]"></a>__aeabi_ui2d</STRONG> (ARM, 0 bytes, Stack size 0 bytes, dflt_noclz.o(x$fpl$dfltu))
<BR><BR>[Called By]<UL><LI><a href="#[b242b8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;main
</UL>

<P><STRONG><a name="[fe43c8]"></a>_dfltu</STRONG> (ARM, 12 bytes, Stack size 0 bytes, dflt_noclz.o(x$fpl$dfltu), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[fe448c]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__dflt_normalise
</UL>

<P><STRONG><a name="[fe3b24]"></a>__aeabi_dmul</STRONG> (ARM, 0 bytes, Stack size 16 bytes, dmul.o(x$fpl$dmul))
<BR><BR>[Stack]<UL><LI>Max Depth = 16<LI>Call Chain = __aeabi_dmul</UL>
<BR>[Called By]<UL><LI><a href="#[b242b8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;main
</UL>

<P><STRONG><a name="[fe3ab0]"></a>_dmul</STRONG> (ARM, 460 bytes, Stack size 16 bytes, dmul.o(x$fpl$dmul), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[fe60f8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_infinity (Weak Reference)
<LI><a href="#[104fbf4]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_dcheck_NaN2
</UL>

<P><STRONG><a name="[fe3b74]"></a>__fpl_inf_dmul</STRONG> (ARM, 0 bytes, Stack size unknown bytes, dmul.o(x$fpl$dmul), UNUSED)

<P><STRONG><a name="[104f240]"></a>__dunder</STRONG> (ARM, 272 bytes, Stack size 4 bytes, dunder.o(x$fpl$dunder), UNUSED)

<P><STRONG><a name="[104f1c8]"></a>__dunder_d</STRONG> (ARM, 4 bytes, Stack size 0 bytes, dunder.o(x$fpl$dunder), UNUSED)

<P><STRONG><a name="[1042660]"></a>_fp_init</STRONG> (ARM, 24 bytes, Stack size 8 bytes, fpinit.o(x$fpl$fpinit))
<BR><BR>[Stack]<UL><LI>Max Depth = 8<LI>Call Chain = _fp_init</UL>
<BR>[Calls]<UL><LI><a href="#[10815e8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__rt_fp_status_addr
</UL>
<BR>[Called By]<UL><LI><a href="#[10498a4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__rt_lib_init (via Veneer)
</UL>

<P><STRONG><a name="[1042554]"></a>__fplib_config_pureend_doubles</STRONG> (ARM, 0 bytes, Stack size unknown bytes, fpinit.o(x$fpl$fpinit), UNUSED)

<P><STRONG><a name="[1047400]"></a>__fpl_return_NaN</STRONG> (ARM, 116 bytes, Stack size 0 bytes, retnan.o(x$fpl$retnan), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1042b10]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fpl_cmpreturn
</UL>
<BR>[Called By]<UL><LI><a href="#[104f6dc]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__fpl_dcheck_NaN1
<LI><a href="#[104fbf4]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__fpl_dcheck_NaN2
</UL>

<P><STRONG><a name="[1042b10]"></a>__fpl_cmpreturn</STRONG> (ARM, 60 bytes, Stack size 0 bytes, trapv.o(x$fpl$trapveneer), UNUSED)
<BR><BR>[Called By]<UL><LI><a href="#[1047400]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;__fpl_return_NaN
</UL>

<P><STRONG><a name="[b285c8]"></a>Undef_Handler</STRONG> (ARM, 4 bytes, Stack size unknown bytes, startup.o(RESET))
<BR><BR>[Calls]<UL><LI><a href="#[b285c8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;Undef_Handler
</UL>
<BR>[Called By]<UL><LI><a href="#[b285c8]">&lt;&lt;</a>&nbsp;&nbsp;&nbsp;Undef_Handler