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110 lines
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110 lines
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<title>ARM ARMv8-M Security Extensions (Using the GNU Compiler Collection (GCC))</title>
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<a name="ARM-ARMv8_002dM-Security-Extensions"></a>
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Next: <a href="AVR-Built_002din-Functions.html#AVR-Built_002din-Functions" accesskey="n" rel="next">AVR Built-in Functions</a>, Previous: <a href="ARM-Floating-Point-Status-and-Control-Intrinsics.html#ARM-Floating-Point-Status-and-Control-Intrinsics" accesskey="p" rel="prev">ARM Floating Point Status and Control Intrinsics</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="ARM-ARMv8_002dM-Security-Extensions-1"></a>
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<h4 class="subsection">6.59.9 ARM ARMv8-M Security Extensions</h4>
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<p>GCC implements the ARMv8-M Security Extensions as described in the ARMv8-M
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Security Extensions: Requirements on Development Tools Engineering
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Specification, which can be found at
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<a href="http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf">http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf</a>.
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</p>
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<p>As part of the Security Extensions GCC implements two new function attributes:
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<code>cmse_nonsecure_entry</code> and <code>cmse_nonsecure_call</code>.
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</p>
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<p>As part of the Security Extensions GCC implements the intrinsics below. FPTR
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is used here to mean any function pointer type.
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</p>
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<div class="smallexample">
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<pre class="smallexample">cmse_address_info_t cmse_TT (void *)
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cmse_address_info_t cmse_TT_fptr (FPTR)
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cmse_address_info_t cmse_TTT (void *)
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cmse_address_info_t cmse_TTT_fptr (FPTR)
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cmse_address_info_t cmse_TTA (void *)
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cmse_address_info_t cmse_TTA_fptr (FPTR)
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cmse_address_info_t cmse_TTAT (void *)
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cmse_address_info_t cmse_TTAT_fptr (FPTR)
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void * cmse_check_address_range (void *, size_t, int)
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typeof(p) cmse_nsfptr_create (FPTR p)
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intptr_t cmse_is_nsfptr (FPTR)
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int cmse_nonsecure_caller (void)
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</pre></div>
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