mipscopaccess.h

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#ifndef __MIPSCOPACCESS_H__
#define __MIPSCOPACCESS_H__
 
#include <tamtypes.h>

#define COP0_REG_Index 0
#define COP0_REG_Random 1
#define COP0_REG_EntryLo0 2
#define COP0_REG_EntryLo1 3
#define COP0_REG_Context 4
#define COP0_REG_PageMask 5
#define COP0_REG_Wired 6
#define COP0_REG_BadVAddr 8
#define COP0_REG_Count 9
#define COP0_REG_EntryHi 10
#define COP0_REG_Compare 11
#define COP0_REG_Status 12
#define COP0_REG_Cause 13
#define COP0_REG_EPC 14
#define COP0_REG_PRId 15
#define COP0_REG_Config 16
#define COP0_REG_BadPAddr 23
#define COP0_REG_Debug 24
#define COP0_REG_Perf 25
#define COP0_REG_TagLo 28
#define COP0_REG_TagHi 29
#define COP0_REG_ErrorPC 30
 
// cop/idx need to be real preprocessor tokens (not just compile-time-
// constant expressions) so # can stringize them directly into the
// mnemonic/register text - real GCC could fold get_mips_cop_reg's old
// "i"-constrained function-parameter version lazily, after always_inline
// substituted each call site's constant arguments, regardless of the
// caller's own -O level. Clang instead validates "i" constraints during
// Sema, before any constant-folding pass runs, so a caller built at -O0
// (e.g. sdk-core's eedebug package) hit "invalid operand for inline asm
// constraint 'i'" even though cop/idx are always real compile-time
// constants at every call site. Macros sidestep the whole question -
// this is why COP0_REG_* above became #defines instead of an enum, so
// they're valid ## arguments here.
// COP0_REG_* are themselves macros, so #cop/#idx need the classic
// two-layer stringize indirection (MIPSCOPACCESS_STR/_XSTR) - a bare
// "#idx" would stringize the literal argument text ("COP0_REG_PRId"),
// not its expansion ("15"); routing through one more macro layer forces
// idx to expand first.
#define MIPSCOPACCESS_STR(x) #x
#define MIPSCOPACCESS_XSTR(x) MIPSCOPACCESS_STR(x)
 
#define get_mips_cop_reg(cop, idx) \
    ({ \
        u32 __val; \
        __asm__ __volatile__("mfc" MIPSCOPACCESS_XSTR(cop) "\t%0, $" MIPSCOPACCESS_XSTR(idx) "\n" : "=r"(__val)); \
        __val; \
    })
 
#define set_mips_cop_reg(cop, idx, val) \
    __asm__ __volatile__("mtc" MIPSCOPACCESS_XSTR(cop) "\t%0, $" MIPSCOPACCESS_XSTR(idx) "\n" :: "r"((u32)(val)))
 
#endif /* __MIPSCOPACCESS_H__ */