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RealView Compiler Reference Guide
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__((noreturn)) __attribute__((pure)) __attribute__((section)) __attribute__((unused)) __attribute__((used)) __attribute__((weak)) Type attributes __attribute__((aligned)) __attribute((packed)) __attribute__((transparent_union)) Variable attributes __attribute__((alias)) __attribute__((at(address))) __attribute__((aligned)) __attribute__((deprecated)) __attribute__((packed)) __attribute__((section)) __attribute__((transparent_union)) __attribute__((unused)) __attribute__((used)) __attribute__((weak)) __attribute__((zero_init)) Pragmas #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 [no_]exceptions_unwind #pragma hdrstop #pragma import symbol_name #pragma [no_]inline #pragma no_pch #pragma Onum #pragma once #pragma Ospace #pragma Otime #pragma pop #pragma push #pragma [no_]softfp_linkage #pragma unroll [(n)] #pragma unroll_completely #pragma thumb Instruction intrinsics __breakpoint __builtin_clz __builtin_constant_p __builtin_expect __builtin_frame_address __builtin_return_address __builtin_popcount __cdp __clrex __clz __current_pc __current_sp __disable_fiq __disable_irq __enable_fiq __enable_irq __fabs __fabsf __force_stores __ldrex __ldrt __memory_changed __nop __pld __pli __qadd __qdbl __qsub __rbit __rev __return_address __ror __schedule_barrier __semihost __sev __sqrt __sqrtf __ssat __strex __strt __swp __usat __wfe __wfi __yield ARMv6 SIMD intrinsics ETSI basic operations C55x intrinsics Named register variables 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__attribute__((at(address)))
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Home > Compiler-specific Features > Variable attributes > __attribute__((at( | |||
This variable attribute enables you to specify the absolute address of a variable.
The variable is placed in its own section, and the section containing the variable is given an appropriate type by the compiler:
Read-only variables are placed in a section with type RO.
Initialized read‑write variables are placed in a section with type RW.
In particular, variables explicitly initialized to zero are placed in RW not ZI. Such variables are not candidates for the ZI-to-RW optimization of the compiler.
Uninitialized variables are placed in a section with type ZI.
Note
This variable attribute is not supported by GNU compilers.
__attribute__((at(address)))
Where:
addressis the desired address of the variable.
The keyword
__atcomes immediately after the variable name.
The linker gives an error message if it is not possible to place a section at a specified address.
const int x1 __attribute__((at(0x10000))) = 10; /* RO */ int x2 __attribute__((at(0x12000))) = 10; /* RW */int x3 __attribute__((at(0x14000))) = 0; /* RW, not ZI */int x4 __attribute__((at(0x16000))); /* ZI */
Using __at sections to place sections at a specific address in the Linker Guide.
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