frame_regs.h revision 1.4
1 1.4 dsl /* $NetBSD: frame_regs.h,v 1.4 2008/02/06 22:02:17 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 1.3 dsl * has been 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 1.4 dsl * 3) The 'struct reg' from machine/reg.h has to match __greg_t. 20 1.4 dsl * Since they are both arrays and indexed with the same tokens this 21 1.4 dsl * shouldn't be a problem, but is rather confusing. 22 1.4 dsl * This assumption is made in a lot of places! 23 1.1 dsl * 4) There might be other code out there that relies on the ordering. 24 1.3 dsl * 25 1.3 dsl * The first entries below match the registers used for syscall arguments 26 1.4 dsl * (%rcx is destroyed by the syscall instruction, the libc system call 27 1.4 dsl * stubs copy %rcx to %r10). 28 1.3 dsl * arg6-arg9 are copied from the user stack for system calls with more 29 1.3 dsl * than 6 args (SYS_MAXSYSARGS is 8, + 2 entries for SYS___SYSCALL). 30 1.1 dsl */ 31 1.1 dsl #define _FRAME_REG(greg, freg) \ 32 1.1 dsl greg(rdi, RDI, 0) \ 33 1.1 dsl greg(rsi, RSI, 1) \ 34 1.1 dsl greg(rdx, RDX, 2) \ 35 1.3 dsl greg(r10, R10, 6) \ 36 1.1 dsl greg(r8, R8, 4) \ 37 1.1 dsl greg(r9, R9, 5) \ 38 1.3 dsl freg(arg6, @, @) /* syscall arg from stack */ \ 39 1.3 dsl freg(arg7, @, @) /* syscall arg from stack */ \ 40 1.3 dsl freg(arg8, @, @) /* syscall arg from stack */ \ 41 1.3 dsl freg(arg9, @, @) /* syscall arg from stack */ \ 42 1.3 dsl greg(rcx, RCX, 3) \ 43 1.1 dsl greg(r11, R11, 7) \ 44 1.1 dsl greg(r12, R12, 8) \ 45 1.1 dsl greg(r13, R13, 9) \ 46 1.1 dsl greg(r14, R14, 10) \ 47 1.1 dsl greg(r15, R15, 11) \ 48 1.1 dsl greg(rbp, RBP, 12) \ 49 1.1 dsl greg(rbx, RBX, 13) \ 50 1.1 dsl greg(rax, RAX, 14) \ 51 1.1 dsl greg(gs, GS, 15) \ 52 1.1 dsl greg(fs, FS, 16) \ 53 1.1 dsl greg(es, ES, 17) \ 54 1.1 dsl greg(ds, DS, 18) \ 55 1.1 dsl greg(trapno, TRAPNO, 19) \ 56 1.1 dsl /* below portion defined in hardware */ \ 57 1.1 dsl greg(err, ERR, 20) /* Dummy inserted if not defined */ \ 58 1.1 dsl greg(rip, RIP, 21) \ 59 1.1 dsl greg(cs, CS, 22) \ 60 1.1 dsl greg(rflags, RFLAGS, 23) \ 61 1.1 dsl /* These are pushed unconditionally on the x86-64 */ \ 62 1.1 dsl greg(rsp, RSP, 24) \ 63 1.1 dsl greg(ss, SS, 25) 64 1.1 dsl 65 1.1 dsl #define _FRAME_NOREG(reg, REG, idx) 66 1.1 dsl 67 1.1 dsl #define _FRAME_GREG(greg) _FRAME_REG(greg, _FRAME_NOREG) 68 1.1 dsl 69 1.1 dsl #endif 70
Indexes created Sat Sep 27 22:09:54 GMT 2025