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frame_regs.h revision 1.2 
      1  1.2  dsl /*	$NetBSD: frame_regs.h,v 1.2 2008/01/04 23:29:54 dsl Exp $	*/
      2  1.1  dsl 
      3  1.1  dsl #ifndef _AMD64_FRAME_REGS_H_
      4  1.1  dsl #define _AMD64_FRAME_REGS_H_
      5  1.1  dsl 
      6  1.1  dsl /*
      7  1.1  dsl  * amd64 registers (and friends) ordered as in a trap/interrupt/syscall frame.
      8  1.1  dsl  * Also the indexes into the 'general register state' (__greg_t) passed to
      9  1.1  dsl  * userland.
     10  1.1  dsl  * Historically they were in the same order, but the order in the frames
     11  1.1  dsl  * will be changed to improve syscall efficiency.
     12  1.1  dsl  *
     13  1.1  dsl  * Notes:
     14  1.1  dsl  * 1) gdb (src/gnu/dist/gdb6/gdb/amd64nbsd-tdep.c) has a lookup table that
     15  1.1  dsl  *    assumes the __greg_t ordering.
     16  1.1  dsl  * 2) src/lib/libc/arch/x86_64/gen/makecontext.c assumes that the first
     17  1.1  dsl  *    6 entries in the __greg_t array match the registers used to pass
     18  1.1  dsl  *    function arguments.
     19  1.2  dsl  * 3) PTHREAD_UCONTEXT_TO_REG (src/lib/libpthread/arch/?*?/pthread_md.h)
     20  1.1  dsl  *    assumes that something matches the __greg_t layout, but there
     21  1.1  dsl  *    are no (obvious) references.
     22  1.1  dsl  * 4) There might be other code out there that relies on the ordering.
     23  1.1  dsl  */
     24  1.1  dsl #define _FRAME_REG(greg, freg) 	\
     25  1.1  dsl 	greg(rdi, RDI, 0)	\
     26  1.1  dsl 	greg(rsi, RSI, 1)	\
     27  1.1  dsl 	greg(rdx, RDX, 2)	\
     28  1.1  dsl 	greg(rcx, RCX, 3)	\
     29  1.1  dsl 	greg(r8,  R8,  4)	\
     30  1.1  dsl 	greg(r9,  R9,  5)	\
     31  1.1  dsl 	greg(r10, R10, 6)	\
     32  1.1  dsl 	greg(r11, R11, 7)	\
     33  1.1  dsl 	greg(r12, R12, 8)	\
     34  1.1  dsl 	greg(r13, R13, 9)	\
     35  1.1  dsl 	greg(r14, R14, 10)	\
     36  1.1  dsl 	greg(r15, R15, 11)	\
     37  1.1  dsl 	greg(rbp, RBP, 12)	\
     38  1.1  dsl 	greg(rbx, RBX, 13)	\
     39  1.1  dsl 	greg(rax, RAX, 14)	\
     40  1.1  dsl 	greg(gs,  GS,  15)	\
     41  1.1  dsl 	greg(fs,  FS,  16)	\
     42  1.1  dsl 	greg(es,  ES,  17)	\
     43  1.1  dsl 	greg(ds,  DS,  18)	\
     44  1.1  dsl 	greg(trapno, TRAPNO, 19)	\
     45  1.1  dsl 	/* below portion defined in hardware */ \
     46  1.1  dsl 	greg(err, ERR, 20)	/* Dummy inserted if not defined */ \
     47  1.1  dsl 	greg(rip, RIP, 21)	\
     48  1.1  dsl 	greg(cs,  CS,  22)	\
     49  1.1  dsl 	greg(rflags, RFLAGS, 23)	\
     50  1.1  dsl 	/* These are pushed unconditionally on the x86-64 */ \
     51  1.1  dsl 	greg(rsp, RSP, 24)	\
     52  1.1  dsl 	greg(ss,  SS,  25)
     53  1.1  dsl 
     54  1.1  dsl #define _FRAME_NOREG(reg, REG, idx)
     55  1.1  dsl 
     56  1.1  dsl #define _FRAME_GREG(greg) _FRAME_REG(greg, _FRAME_NOREG)
     57  1.1  dsl 
     58  1.1  dsl #endif
     59