2 * Common helper functions for kprobes and uprobes
4 * Copyright IBM Corp. 2014
7 #include <linux/errno.h>
8 #include <asm/kprobes.h>
11 int probe_is_prohibited_opcode(u16 *insn)
13 if (!is_known_insn((unsigned char *)insn))
15 switch (insn[0] >> 8) {
16 case 0x0c: /* bassm */
20 case 0xac: /* stnsm */
21 case 0xad: /* stosm */
24 switch (insn[0] & 0x0f) {
31 case 0xb25a: /* bsa */
32 case 0xb240: /* bakr */
33 case 0xb258: /* bsg */
36 case 0xb98d: /* epsw */
37 case 0xe560: /* tbegin */
38 case 0xe561: /* tbeginc */
39 case 0xb2f8: /* tend */
45 int probe_get_fixup_type(u16 *insn)
47 /* default fixup method */
48 int fixup = FIXUP_PSW_NORMAL;
50 switch (insn[0] >> 8) {
53 fixup = FIXUP_RETURN_REGISTER;
54 /* if r2 = 0, no branch will be taken */
55 if ((insn[0] & 0x0f) == 0)
56 fixup |= FIXUP_BRANCH_NOT_TAKEN;
60 fixup = FIXUP_BRANCH_NOT_TAKEN;
64 fixup = FIXUP_RETURN_REGISTER;
70 fixup = FIXUP_BRANCH_NOT_TAKEN;
73 fixup = FIXUP_NOT_REQUIRED;
75 case 0xb2: /* lpswe */
76 if ((insn[0] & 0xff) == 0xb2)
77 fixup = FIXUP_NOT_REQUIRED;
80 if ((insn[0] & 0x0f) == 0x05)
81 fixup |= FIXUP_RETURN_REGISTER;
84 if ((insn[0] & 0x0f) == 0x05) /* brasl */
85 fixup |= FIXUP_RETURN_REGISTER;
88 switch (insn[2] & 0xff) {
90 case 0x45: /* bxleg */
91 fixup = FIXUP_BRANCH_NOT_TAKEN;
96 if ((insn[2] & 0xff) == 0x46)
97 fixup = FIXUP_BRANCH_NOT_TAKEN;
100 switch (insn[2] & 0xff) {
101 case 0xe5: /* clgrb */
102 case 0xe6: /* cgrb */
104 case 0xf7: /* clrb */
105 case 0xfc: /* cgib */
106 case 0xfd: /* cglib */
108 case 0xff: /* clib */
109 fixup = FIXUP_BRANCH_NOT_TAKEN;
117 int probe_is_insn_relative_long(u16 *insn)
119 /* Check if we have a RIL-b or RIL-c format instruction which
120 * we need to modify in order to avoid instruction emulation. */
121 switch (insn[0] >> 8) {
123 if ((insn[0] & 0x0f) == 0x00) /* larl */
127 switch (insn[0] & 0x0f) {
128 case 0x02: /* llhrl */
129 case 0x04: /* lghrl */
130 case 0x05: /* lhrl */
131 case 0x06: /* llghrl */
132 case 0x07: /* sthrl */
133 case 0x08: /* lgrl */
134 case 0x0b: /* stgrl */
135 case 0x0c: /* lgfrl */
137 case 0x0e: /* llgfrl */
138 case 0x0f: /* strl */
143 switch (insn[0] & 0x0f) {
144 case 0x02: /* pfdrl */
145 case 0x04: /* cghrl */
146 case 0x05: /* chrl */
147 case 0x06: /* clghrl */
148 case 0x07: /* clhrl */
149 case 0x08: /* cgrl */
150 case 0x0a: /* clgrl */
151 case 0x0c: /* cgfrl */
153 case 0x0e: /* clgfrl */
154 case 0x0f: /* clrl */