70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/* $NetBSD: frame_regs.h,v 1.4 2008/02/06 22:02:17 dsl Exp $ */
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#ifndef _AMD64_FRAME_REGS_H_
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#define _AMD64_FRAME_REGS_H_
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/*
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* amd64 registers (and friends) ordered as in a trap/interrupt/syscall frame.
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* Also the indexes into the 'general register state' (__greg_t) passed to
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* userland.
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* Historically they were in the same order, but the order in the frames
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* has been changed to improve syscall efficiency.
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*
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* Notes:
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* 1) gdb (src/gnu/dist/gdb6/gdb/amd64nbsd-tdep.c) has a lookup table that
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* assumes the __greg_t ordering.
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* 2) src/lib/libc/arch/x86_64/gen/makecontext.c assumes that the first
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* 6 entries in the __greg_t array match the registers used to pass
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* function arguments.
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* 3) The 'struct reg' from machine/reg.h has to match __greg_t.
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* Since they are both arrays and indexed with the same tokens this
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* shouldn't be a problem, but is rather confusing.
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* This assumption is made in a lot of places!
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* 4) There might be other code out there that relies on the ordering.
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*
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* The first entries below match the registers used for syscall arguments
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* (%rcx is destroyed by the syscall instruction, the libc system call
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* stubs copy %rcx to %r10).
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* arg6-arg9 are copied from the user stack for system calls with more
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* than 6 args (SYS_MAXSYSARGS is 8, + 2 entries for SYS___SYSCALL).
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*/
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#define _FRAME_REG(greg, freg) \
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greg(rdi, RDI, 0) \
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greg(rsi, RSI, 1) \
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greg(rdx, RDX, 2) \
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greg(r10, R10, 6) \
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greg(r8, R8, 4) \
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greg(r9, R9, 5) \
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freg(arg6, @, @) /* syscall arg from stack */ \
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freg(arg7, @, @) /* syscall arg from stack */ \
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freg(arg8, @, @) /* syscall arg from stack */ \
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freg(arg9, @, @) /* syscall arg from stack */ \
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greg(rcx, RCX, 3) \
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greg(r11, R11, 7) \
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greg(r12, R12, 8) \
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greg(r13, R13, 9) \
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greg(r14, R14, 10) \
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greg(r15, R15, 11) \
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greg(rbp, RBP, 12) \
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greg(rbx, RBX, 13) \
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greg(rax, RAX, 14) \
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greg(gs, GS, 15) \
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greg(fs, FS, 16) \
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greg(es, ES, 17) \
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greg(ds, DS, 18) \
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greg(trapno, TRAPNO, 19) \
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/* below portion defined in hardware */ \
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greg(err, ERR, 20) /* Dummy inserted if not defined */ \
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greg(rip, RIP, 21) \
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greg(cs, CS, 22) \
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greg(rflags, RFLAGS, 23) \
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/* These are pushed unconditionally on the x86-64 */ \
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greg(rsp, RSP, 24) \
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greg(ss, SS, 25)
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#define _FRAME_NOREG(reg, REG, idx)
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#define _FRAME_GREG(greg) _FRAME_REG(greg, _FRAME_NOREG)
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#endif
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