1/*
2 * On i386, pt_regs and user_regs_struct are the same,
3 * but on 64 bit x86, user_regs_struct has six more fields:
4 * fs_base, gs_base, ds, es, fs, gs.
5 * PTRACE_GETREGS fills them too, so struct pt_regs would overflow.
6 */
7struct i386_user_regs_struct {
8	uint32_t ebx;
9	uint32_t ecx;
10	uint32_t edx;
11	uint32_t esi;
12	uint32_t edi;
13	uint32_t ebp;
14	uint32_t eax;
15	uint32_t xds;
16	uint32_t xes;
17	uint32_t xfs;
18	uint32_t xgs;
19	uint32_t orig_eax;
20	uint32_t eip;
21	uint32_t xcs;
22	uint32_t eflags;
23	uint32_t esp;
24	uint32_t xss;
25};
26static union {
27	struct user_regs_struct      x86_64_r;
28	struct i386_user_regs_struct i386_r;
29} x86_regs_union;
30#define x86_64_regs x86_regs_union.x86_64_r
31#define i386_regs   x86_regs_union.i386_r
32
33uint32_t *const i386_esp_ptr = &i386_regs.esp;
34uint64_t *const x86_64_rsp_ptr = (uint64_t *) &x86_64_regs.rsp;
35static struct iovec x86_io = {
36	.iov_base = &x86_regs_union
37};
38
39#define ARCH_REGS_FOR_GETREGSET x86_regs_union
40#define ARCH_IOVEC_FOR_GETREGSET x86_io
41#define ARCH_PC_REG (x86_io.iov_len == sizeof(i386_regs) ? i386_regs.eip : x86_64_regs.rip)
42