frame_regs.h revision 1.3.2.2
1 1.3.2.2 bouyer /* $NetBSD: frame_regs.h,v 1.3.2.2 2008/01/08 22:09:19 bouyer Exp $ */ 2 1.3.2.2 bouyer 3 1.3.2.2 bouyer #ifndef _AMD64_FRAME_REGS_H_ 4 1.3.2.2 bouyer #define _AMD64_FRAME_REGS_H_ 5 1.3.2.2 bouyer 6 1.3.2.2 bouyer /* 7 1.3.2.2 bouyer * amd64 registers (and friends) ordered as in a trap/interrupt/syscall frame. 8 1.3.2.2 bouyer * Also the indexes into the 'general register state' (__greg_t) passed to 9 1.3.2.2 bouyer * userland. 10 1.3.2.2 bouyer * Historically they were in the same order, but the order in the frames 11 1.3.2.2 bouyer * has been changed to improve syscall efficiency. 12 1.3.2.2 bouyer * 13 1.3.2.2 bouyer * Notes: 14 1.3.2.2 bouyer * 1) gdb (src/gnu/dist/gdb6/gdb/amd64nbsd-tdep.c) has a lookup table that 15 1.3.2.2 bouyer * assumes the __greg_t ordering. 16 1.3.2.2 bouyer * 2) src/lib/libc/arch/x86_64/gen/makecontext.c assumes that the first 17 1.3.2.2 bouyer * 6 entries in the __greg_t array match the registers used to pass 18 1.3.2.2 bouyer * function arguments. 19 1.3.2.2 bouyer * 3) PTHREAD_UCONTEXT_TO_REG (src/lib/libpthread/arch/?*?/pthread_md.h) 20 1.3.2.2 bouyer * assumes that something matches the __greg_t layout, but there 21 1.3.2.2 bouyer * are no (obvious) references. 22 1.3.2.2 bouyer * 4) There might be other code out there that relies on the ordering. 23 1.3.2.2 bouyer * 24 1.3.2.2 bouyer * The first entries below match the registers used for syscall arguments 25 1.3.2.2 bouyer * (%rcx is destroyed by the syscall instruction, to the libc stubs copy 26 1.3.2.2 bouyer * the value to %r10). 27 1.3.2.2 bouyer * arg6-arg9 are copied from the user stack for system calls with more 28 1.3.2.2 bouyer * than 6 args (SYS_MAXSYSARGS is 8, + 2 entries for SYS___SYSCALL). 29 1.3.2.2 bouyer */ 30 1.3.2.2 bouyer #define _FRAME_REG(greg, freg) \ 31 1.3.2.2 bouyer greg(rdi, RDI, 0) \ 32 1.3.2.2 bouyer greg(rsi, RSI, 1) \ 33 1.3.2.2 bouyer greg(rdx, RDX, 2) \ 34 1.3.2.2 bouyer greg(r10, R10, 6) \ 35 1.3.2.2 bouyer greg(r8, R8, 4) \ 36 1.3.2.2 bouyer greg(r9, R9, 5) \ 37 1.3.2.2 bouyer freg(arg6, @, @) /* syscall arg from stack */ \ 38 1.3.2.2 bouyer freg(arg7, @, @) /* syscall arg from stack */ \ 39 1.3.2.2 bouyer freg(arg8, @, @) /* syscall arg from stack */ \ 40 1.3.2.2 bouyer freg(arg9, @, @) /* syscall arg from stack */ \ 41 1.3.2.2 bouyer greg(rcx, RCX, 3) \ 42 1.3.2.2 bouyer greg(r11, R11, 7) \ 43 1.3.2.2 bouyer greg(r12, R12, 8) \ 44 1.3.2.2 bouyer greg(r13, R13, 9) \ 45 1.3.2.2 bouyer greg(r14, R14, 10) \ 46 1.3.2.2 bouyer greg(r15, R15, 11) \ 47 1.3.2.2 bouyer greg(rbp, RBP, 12) \ 48 1.3.2.2 bouyer greg(rbx, RBX, 13) \ 49 1.3.2.2 bouyer greg(rax, RAX, 14) \ 50 1.3.2.2 bouyer greg(gs, GS, 15) \ 51 1.3.2.2 bouyer greg(fs, FS, 16) \ 52 1.3.2.2 bouyer greg(es, ES, 17) \ 53 1.3.2.2 bouyer greg(ds, DS, 18) \ 54 1.3.2.2 bouyer greg(trapno, TRAPNO, 19) \ 55 1.3.2.2 bouyer /* below portion defined in hardware */ \ 56 1.3.2.2 bouyer greg(err, ERR, 20) /* Dummy inserted if not defined */ \ 57 1.3.2.2 bouyer greg(rip, RIP, 21) \ 58 1.3.2.2 bouyer greg(cs, CS, 22) \ 59 1.3.2.2 bouyer greg(rflags, RFLAGS, 23) \ 60 1.3.2.2 bouyer /* These are pushed unconditionally on the x86-64 */ \ 61 1.3.2.2 bouyer greg(rsp, RSP, 24) \ 62 1.3.2.2 bouyer greg(ss, SS, 25) 63 1.3.2.2 bouyer 64 1.3.2.2 bouyer #define _FRAME_NOREG(reg, REG, idx) 65 1.3.2.2 bouyer 66 1.3.2.2 bouyer #define _FRAME_GREG(greg) _FRAME_REG(greg, _FRAME_NOREG) 67 1.3.2.2 bouyer 68 1.3.2.2 bouyer #endif 69
Indexes created Sat Nov 01 21:09:44 GMT 2025