arch/alpha/include/uapi/asm/regdef.h

25

#define a0 $16 /* argument registers (caller-saved) */

arch/loongarch/include/asm/regdef.h

12

#define a0 $r4 /* argument registers, a0/a1 reused as v0/v1 for return value */

arch/m68k/lib/divsi3.S

77

#define a0 REG (a0)

arch/m68k/lib/modsi3.S

77

#define a0 REG (a0)

arch/m68k/lib/mulsi3.S

75

#define a0 REG (a0)

arch/m68k/lib/udivsi3.S

75

#define a0 REG (a0)

arch/m68k/lib/umodsi3.S

75

#define a0 REG (a0)

arch/mips/include/asm/regdef.h

116

#define a0 $4 /* argument registers */

arch/mips/include/asm/regdef.h

159

#define a0 $4 /* argument registers */

tools/testing/selftests/kvm/include/loongarch/processor.h

15

#define a0 $r4