NAME
NXGetAllArchInfos, NXGetLocalArchInfo, NXGetArchInfoFromName, NXGetArchInfoFromCpuType, NXFindBestFatArch, NXCombineCpuSubtypes — get architecture information
SYNOPSIS
#include <mach-o/arch.h>
extern const NXArchInfo *
NXGetAllArchInfos(void);
extern const NXArchInfo *
NXGetLocalArchInfo(void);
extern const NXArchInfo *
NXGetArchInfoFromName(const char *name);
extern const NXArchInfo *
NXGetArchInfoFromCpuType(cpu_type_t cputype, cpu_subtype_t cpusubtype);
extern struct fat_arch *
NXFindBestFatArch(cpu_type_t cputype, cpu_subtype_t cpusubtype, struct fat_arch *fat_archs, unsigned long nfat_archs);
extern cpu_subtype_t
NXCombineCpuSubtypes(cpu_type_t cputype, cpu_subtype_t cpusubtype1, cpu_subtype_t cpusubtype2);
DESCRIPTION
These functions are intended for use in programs that have to deal with fat files or programs that can target multiple architectures. Typically, a program will use a command-line argument that starts with ’’−arch name’’, where this specifies an architecture. These functions and data structures provide some help for processing architecture flags and then processing the contents of a fat file.
The structure NXArchInfo is defined in ⟨ mach-o/arch.h⟩ :
typedef struct {
const char *name;
cpu_type_t cputype;
cpu_subtype_t cpusubtype;
enum NXByteOrder byteorder;
const char *description;
} NXArchInfo;
It is used to hold the name of the architecture and the corresponding CPU type and CPU subtype, together with the architecture’s byte order and a brief description string.
The currently known architectures are:
Name
CPU Type
CPU Subtype
Description
ppc
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_ALL
PowerPC
i386
CPU_TYPE_I386
CPU_SUBTYPE_I386_ALL
Intel 80x86
m68k
CPU_TYPE_MC680x0
CPU_SUBTYPE_MC680x0_ALL
Motorola 68K
hppa
CPU_TYPE_HPPA
CPU_SUBTYPE_HPPA_ALL
HP-PA
i860
CPU_TYPE_I860
CPU_SUBTYPE_I860_ALL
Intel 860
m88k
CPU_TYPE_MC88000
CPU_SUBTYPE_MC88000_ALL
Motorola 88K
sparc
CPU_TYPE_SPARC
CPU_SUBTYPE_SPARC_ALL
SPARC
ppc601
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_601
PowerPC 601
ppc603
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_603
PowerPC 603
ppc604
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_604
PowerPC 604
ppc604e
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_604e
PowerPC 604e
ppc750
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_750
PowerPC 750
ppc7400
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_7400
PowerPC 7400
ppc7450
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_7450
PowerPC 7450
ppc970
CPU_TYPE_POWERPC
CPU_SUBTYPE_POWERPC_970
PowerPC 970
i486
CPU_TYPE_I386
CPU_SUBTYPE_486
Intel 486
i486SX
CPU_TYPE_I386
CPU_SUBTYPE_486SX
Intel 486SX
pentium
CPU_TYPE_I386
CPU_SUBTYPE_PENT
Intel Pentium
i586
CPU_TYPE_I386
CPU_SUBTYPE_586
Intel 586
pentpro
CPU_TYPE_I386
CPU_SUBTYPE_PENTPRO
Intel Pentium Pro
i686
CPU_TYPE_I386
CPU_SUBTYPE_PENTPRO
Intel Pentium Pro
pentIIm3
CPU_TYPE_I386
CPU_SUBTYPE_PENTII_M3
Intel Pentium II Model 3
pentIIm5
CPU_TYPE_I386
CPU_SUBTYPE_PENTII_M5
Intel Pentium II Model 5
m68030
CPU_TYPE_MC680x0
CPU_SUBTYPE_MC68030_ONLY
Motorola 68030
m68040
CPU_TYPE_MC680x0
CPU_SUBTYPE_MC68040
Motorola 68040
hppa7100LC
CPU_TYPE_HPPA
CPU_SUBTYPE_HPPA_7100LC
HP-PA 7100LC
The first set of entries are used for the architecture family. The second set of entries are used for a specific architecture, when more than one specific architecture is supported in a family of architectures.
NXGetAllArchInfos() returns a pointer to an array of all known NXArchInfo structures. The last NXArchInfo is marked by a NULL name.
NXGetLocalArchInfo() returns the NXArchInfo for the local host, or NULL if none is known.
NXGetArchInfoFromName() and NXGetArchInfoFromCpuType() return the NXArchInfo from the architecture’s name or CPU type/CPU subtype combination. A CPU subtype of CPU_SUBTYPE_MULTIPLE can be used to request the most general NXArchInfo known for the given CPU type. NULL is returned if no matching NXArchInfo can be found.
NXFindBestFatArch() is passed a CPU type and CPU subtype and a set of fat_arch structs. It selects the best one that matches (if any), and returns a pointer to that fat_arch struct (or NULL). The fat_arch structs must be in the host byte order and correct such that fat_archs really points to enough memory for nfat_archs structs. It is possible that this routine could fail if new CPU types or CPU subtypes are added and an old version of this routine is used. But if there is an exact match between the CPU type and CPU subtype and one of the fat_arch structs, this routine will always succeed.
NXCombineCpuSubtypes() returns the resulting CPU subtype when combining two different CPU subtypes for the specified CPU type. If the two CPU subtypes can’t be combined (the specific subtypes are mutually exclusive), -1 is returned, indicating it is an error to combine them. This can also fail and return -1 if new CPU types or CPU subtypes are added and an old version of this routine is used. But if the CPU subtypes are the same, they can always be combined and this routine will return the CPU subtype passed in.
SEE ALSO
May 21, 2003