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553cb3ed46
sys/param.h was manually adjusted to not define __NetBSD_Version__ since it will be defined by the compiler.
71 lines
No EOL
2.7 KiB
C
Vendored
71 lines
No EOL
2.7 KiB
C
Vendored
/* $NetBSD: frame_regs.h,v 1.8 2021/04/17 20:12:55 rillig 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 (amd64nbsd-tdep.c) has a lookup table that assumes the __greg_t
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* 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) /* tf_rdi */ \
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greg(rsi, RSI, 1) /* tf_rsi */ \
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greg(rdx, RDX, 2) /* tf_rdx */ \
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greg(r10, R10, 6) /* tf_r10 */ \
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greg(r8, R8, 4) /* tf_r8 */ \
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greg(r9, R9, 5) /* tf_r9 */ \
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freg(arg6, @, @) /* tf_arg6: syscall arg from stack */ \
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freg(arg7, @, @) /* tf_arg7: syscall arg from stack */ \
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freg(arg8, @, @) /* tf_arg8: syscall arg from stack */ \
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freg(arg9, @, @) /* tf_arg9: syscall arg from stack */ \
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greg(rcx, RCX, 3) /* tf_rcx */ \
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greg(r11, R11, 7) /* tf_r11 */ \
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greg(r12, R12, 8) /* tf_r12 */ \
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greg(r13, R13, 9) /* tf_r13 */ \
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greg(r14, R14, 10) /* tf_r14 */ \
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greg(r15, R15, 11) /* tf_r15 */ \
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greg(rbp, RBP, 12) /* tf_rbp */ \
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greg(rbx, RBX, 13) /* tf_rbx */ \
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greg(rax, RAX, 14) /* tf_rax */ \
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greg(gs, GS, 15) /* tf_gs */ \
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greg(fs, FS, 16) /* tf_fs */ \
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greg(es, ES, 17) /* tf_es */ \
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greg(ds, DS, 18) /* tf_ds */ \
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greg(trapno, TRAPNO, /* tf_trapno */ \
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19) \
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/* Below portion defined in hardware */ \
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greg(err, ERR, 20) /* tf_err: Dummy inserted if not defined */ \
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greg(rip, RIP, 21) /* tf_rip */ \
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greg(cs, CS, 22) /* tf_cs */ \
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greg(rflags, RFLAGS, /* tf_rflags */ \
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23) \
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/* These are pushed unconditionally on the x86-64 */ \
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greg(rsp, RSP, 24) /* tf_rsp */ \
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greg(ss, SS, 25) /* tf_ss */
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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 |