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Preface Introduction Compiler Command-line Options Language Extensions 
Compiler-specific Features Keywords and operators 
__align __alignof__ __ALIGNOF__ __asm __forceinline __global_reg __inline __int64 __INTADDR__ __irq __packed __pure __smc __softfp __svc __svc_indirect __svc_indirect_r7 __value_in_regs __weak __writeonly __declspec attributes __declspec(dllexport) __declspec(dllimport) __declspec(noinline) __declspec(noreturn) __declspec(nothrow) __declspec(notshared) __declspec(thread) Function attributes __attribute__((alias)) __attribute__((always_inline)) __attribute__((const)) __attribute__((deprecated)) __attribute__((malloc)) __attribute__((noinline)) __attribute__((no_instrument_function)) __attribute__((nomerge)) __attribute__((nonnull)) __attribute__((noreturn)) __attribute__((notailcall)) __attribute__((pure)) __attribute__((section("name"))) __attribute__((unused)) __attribute__((used)) __attribute__((visibility("visibility_type"))) __attribute__((weak)) Type attributes __attribute__((bitband)) __attribute__((aligned)) __attribute((packed)) __attribute__((transparent_union)) Variable attributes __attribute__((alias)) __attribute__((at(address))) __attribute__((aligned)) __attribute__((deprecated)) __attribute__((packed)) __attribute__((section("name"))) __attribute__((transparent_union)) __attribute__((unused)) __attribute__((used)) __attribute__((visibility("visibility_type"))) __attribute__((weak)) __attribute__((zero_init)) Pragmas #pragma anon_unions, #pragma no_anon_unions #pragma arm #pragma arm section [section_sort_list] #pragma diag_default tag[,tag,...] #pragma diag_error tag[,tag,...] #pragma diag_remark tag[,tag,...] #pragma diag_suppress tag[,tag,...] #pragma diag_warning tag[, tag, ...] #pragma exceptions_unwind, #pragma no_exceptions_u #pragma hdrstop #pragma import symbol_name #pragma import(__use_full_stdio) #pragma inline, #pragma no_inline #pragma no_pch #pragma Onum #pragma once #pragma Ospace #pragma Otime #pragma pack(n) #pragma pop #pragma push #pragma softfp_linkage, #pragma no_softfp_linkage #pragma unroll [(n)] #pragma unroll_completely #pragma thumb Instruction intrinsics __breakpoint __cdp __clrex __clz __current_pc __current_sp __disable_fiq __disable_irq __enable_fiq __enable_irq __fabs __fabsf __force_stores __ldrex __ldrexd __ldrt __memory_changed __nop __pld __pli __qadd __qdbl __qsub __rbit __rev __return_address __ror __schedule_barrier __sev __sqrt __sqrtf __ssat __strex __strexd __strt __swp __usat __wfe __wfi __yield ARMv6 SIMD intrinsics ETSI basic operations C55x intrinsics Named register variables VFP status intrinsic __vfp_status GNU builtin functions Nonstandard functions C99 functions C99 functions in the C90 reserved namespace C94 functions C90 functions C99 floating-point functions Other builtin functions Compiler predefines Predefined macros Function names C and C++ Implementation Details Via File Syntax Standard C Implementation Definition Standard C++ Implementation Definition C and C++ Compiler Implementation Limits__smc
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The __smc keyword declares an SMC (Secure Monitor Call) function. A call to the SMC function inserts an SMC instruction into the instruction stream generated by the compiler at the point of function invocation.
Note
The SMC instruction replaces the SMI instruction used in previous versions of the ARM assembly language.
__smc is a function qualifier. It affects the type of a function.
__smc(int smc_num) return-type function-name([argument-list]);
Where:
smc_numIs a 16-bit immediate value used in the
SMCinstruction.The value of
smc_num
The SMC instruction is available for selected ARM architecture-based processors, if they have the Security Extensions. See SMC in the Assembler Guide for more information.
The compiler generates an error if you compile source code containing the __smc keyword for an architecture that does not support the SMC instruction.
__smc(5) void mycall(void); /* declare a name by which SMC #5 can be called */ ... mycall(); /* invoke the function */
SMC in the Assembler Guide.
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