1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_ASMAXP_PTRACE_H
3 #define _UAPI_ASMAXP_PTRACE_H
4
5
6 /*
7 * This struct defines the way the registers are stored on the
8 * kernel stack during a system call or other kernel entry
9 *
10 * NOTE! I want to minimize the overhead of system calls, so this
11 * struct has as little information as possible. It does not have
12 *
13 * - floating point regs: the kernel doesn't change those
14 * - r9-15: saved by the C compiler
15 *
16 * This makes "fork()" and "exec()" a bit more complex, but should
17 * give us low system call latency.
18 */
19
20 struct pt_regs {
21 unsigned long r0;
22 unsigned long r1;
23 unsigned long r2;
24 unsigned long r3;
25 unsigned long r4;
26 unsigned long r5;
27 unsigned long r6;
28 unsigned long r7;
29 unsigned long r8;
30 unsigned long r19;
31 unsigned long r20;
32 unsigned long r21;
33 unsigned long r22;
34 unsigned long r23;
35 unsigned long r24;
36 unsigned long r25;
37 unsigned long r26;
38 unsigned long r27;
39 unsigned long r28;
40 unsigned long hae;
41 /* JRP - These are the values provided to a0-a2 by PALcode */
42 unsigned long trap_a0;
43 unsigned long trap_a1;
44 unsigned long trap_a2;
45 /* These are saved by PAL-code: */
46 unsigned long ps;
47 unsigned long pc;
48 unsigned long gp;
49 unsigned long r16;
50 unsigned long r17;
51 unsigned long r18;
52 };
53
54 /*
55 * This is the extended stack used by signal handlers and the context
56 * switcher: it's pushed after the normal "struct pt_regs".
57 */
58 struct switch_stack {
59 unsigned long r9;
60 unsigned long r10;
61 unsigned long r11;
62 unsigned long r12;
63 unsigned long r13;
64 unsigned long r14;
65 unsigned long r15;
66 unsigned long r26;
67 unsigned long fp[32]; /* fp[31] is fpcr */
68 };
69
70
71 #endif /* _UAPI_ASMAXP_PTRACE_H */