/*
* amd64 registers (and friends) ordered as in a trap/interrupt/syscall frame.
* Also the indexes into the 'general register state' (__greg_t) passed to
* userland.
* Historically they were in the same order, but the order in the frames
* has been changed to improve syscall efficiency.
*
* Notes:
* 1) gdb (amd64nbsd-tdep.c) has a lookup table that assumes the __greg_t
* ordering.
* 2) src/lib/libc/arch/x86_64/gen/makecontext.c assumes that the first
* 6 entries in the __greg_t array match the registers used to pass
* function arguments.
* 3) The 'struct reg' from machine/reg.h has to match __greg_t.
* Since they are both arrays and indexed with the same tokens this
* shouldn't be a problem, but is rather confusing.
* This assumption is made in a lot of places!
* 4) There might be other code out there that relies on the ordering.
*
* The first entries below match the registers used for syscall arguments
* (%rcx is destroyed by the syscall instruction, the libc system call
* stubs copy %rcx to %r10).
* arg6-arg9 are copied from the user stack for system calls with more
* than 6 args (SYS_MAXSYSARGS is 8, + 2 entries for SYS___SYSCALL).
*/
#define _FRAME_REG(greg, freg) \
greg(rdi, RDI, 0) /* tf_rdi */ \
greg(rsi, RSI, 1) /* tf_rsi */ \
greg(rdx, RDX, 2) /* tf_rdx */ \
greg(r10, R10, 6) /* tf_r10 */ \
greg(r8, R8, 4) /* tf_r8 */ \
greg(r9, R9, 5) /* tf_r9 */ \
freg(arg6, @, @) /* tf_arg6: syscall arg from stack */ \
freg(arg7, @, @) /* tf_arg7: syscall arg from stack */ \
freg(arg8, @, @) /* tf_arg8: syscall arg from stack */ \
freg(arg9, @, @) /* tf_arg9: syscall arg from stack */ \
greg(rcx, RCX, 3) /* tf_rcx */ \
greg(r11, R11, 7) /* tf_r11 */ \
greg(r12, R12, 8) /* tf_r12 */ \
greg(r13, R13, 9) /* tf_r13 */ \
greg(r14, R14, 10) /* tf_r14 */ \
greg(r15, R15, 11) /* tf_r15 */ \
greg(rbp, RBP, 12) /* tf_rbp */ \
greg(rbx, RBX, 13) /* tf_rbx */ \
greg(rax, RAX, 14) /* tf_rax */ \
greg(gs, GS, 15) /* tf_gs */ \
greg(fs, FS, 16) /* tf_fs */ \
greg(es, ES, 17) /* tf_es */ \
greg(ds, DS, 18) /* tf_ds */ \
greg(trapno, TRAPNO, /* tf_trapno */ \
19) \
/* Below portion defined in hardware */ \
greg(err, ERR, 20) /* tf_err: Dummy inserted if not defined */ \
greg(rip, RIP, 21) /* tf_rip */ \
greg(cs, CS, 22) /* tf_cs */ \
greg(rflags, RFLAGS, /* tf_rflags */ \
23) \
/* These are pushed unconditionally on the x86-64 */ \
greg(rsp, RSP, 24) /* tf_rsp */ \
greg(ss, SS, 25) /* tf_ss */
