xref: /openbmc/linux/arch/alpha/include/uapi/asm/ptrace.h (revision bbb774d9)
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 */
72