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ARM: Remove use of struct kprobe from generic probes code

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Change the generic ARM probes code to pass in the opcode and architecture-specific
structure separately instead of using struct kprobe, so we do not pollute
code being used only for uprobes or other non-kprobes instruction
interpretation.

Signed-off-by: David A. Long <dave.long@linaro.org>
Acked-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
David A. Long 2014-03-07 11:19:32 -05:00
parent 3e6cd394bb
commit 7579f4b376
10 changed files with 201 additions and 170 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm/include/asm/probes.h
View File

@ -21,9 +21,14 @@
struct kprobe;
typedef void (kprobe_insn_handler_t)(struct kprobe *, struct pt_regs *);
struct arch_specific_insn;
typedef void (kprobe_insn_handler_t)(kprobe_opcode_t,
struct arch_specific_insn *,
struct pt_regs *);
typedef unsigned long (kprobe_check_cc)(unsigned long);
typedef void (kprobe_insn_singlestep_t)(struct kprobe *, struct pt_regs *);
typedef void (kprobe_insn_singlestep_t)(kprobe_opcode_t,
struct arch_specific_insn *,
struct pt_regs *);
typedef void (kprobe_insn_fn_t)(void);
/* Architecture specific copy of original instruction. */

61
arch/arm/kernel/kprobes-arm.c
View File

@ -72,12 +72,11 @@
"mov pc, "reg" \n\t"
#endif
static void __kprobes
emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
emulate_ldrdstrd(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = (unsigned long)p->addr + 8;
unsigned long pc = regs->ARM_pc + 4;
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -92,7 +91,7 @@ emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
BLX("%[fn]")
: "=r" (rtv), "=r" (rt2v), "=r" (rnv)
: "0" (rtv), "1" (rt2v), "2" (rnv), "r" (rmv),
[fn] "r" (p->ainsn.insn_fn)
[fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -103,10 +102,10 @@ emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_ldr(struct kprobe *p, struct pt_regs *regs)
emulate_ldr(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = (unsigned long)p->addr + 8;
unsigned long pc = regs->ARM_pc + 4;
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -119,7 +118,7 @@ emulate_ldr(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rtv), "=r" (rnv)
: "1" (rnv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
: "1" (rnv), "r" (rmv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -133,11 +132,11 @@ emulate_ldr(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_str(struct kprobe *p, struct pt_regs *regs)
emulate_str(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long rtpc = (unsigned long)p->addr + str_pc_offset;
unsigned long rnpc = (unsigned long)p->addr + 8;
unsigned long rtpc = regs->ARM_pc - 4 + str_pc_offset;
unsigned long rnpc = regs->ARM_pc + 4;
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -151,7 +150,7 @@ emulate_str(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rnv)
: "r" (rtv), "0" (rnv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
: "r" (rtv), "0" (rnv), "r" (rmv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -160,10 +159,10 @@ emulate_str(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_rd12rn16rm0rs8_rwflags(struct kprobe *p, struct pt_regs *regs)
emulate_rd12rn16rm0rs8_rwflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = (unsigned long)p->addr + 8;
unsigned long pc = regs->ARM_pc + 4;
int rd = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -183,7 +182,7 @@ emulate_rd12rn16rm0rs8_rwflags(struct kprobe *p, struct pt_regs *regs)
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv), "r" (rsv),
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
"1" (cpsr), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -195,9 +194,9 @@ emulate_rd12rn16rm0rs8_rwflags(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_rd12rn16rm0_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
emulate_rd12rn16rm0_rwflags_nopc(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -213,7 +212,7 @@ emulate_rd12rn16rm0_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv),
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
"1" (cpsr), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -222,9 +221,10 @@ emulate_rd12rn16rm0_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_rd16rn12rm0rs8_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
emulate_rd16rn12rm0rs8_rwflags_nopc(kprobe_opcode_t insn,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 16) & 0xf;
int rn = (insn >> 12) & 0xf;
int rm = insn & 0xf;
@ -242,7 +242,7 @@ emulate_rd16rn12rm0rs8_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv), "r" (rsv),
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
"1" (cpsr), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -251,9 +251,9 @@ emulate_rd16rn12rm0rs8_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_rd12rm0_noflags_nopc(struct kprobe *p, struct pt_regs *regs)
emulate_rd12rm0_noflags_nopc(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 12) & 0xf;
int rm = insn & 0xf;
@ -263,7 +263,7 @@ emulate_rd12rm0_noflags_nopc(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rdv)
: "0" (rdv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
: "0" (rdv), "r" (rmv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -271,9 +271,10 @@ emulate_rd12rm0_noflags_nopc(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_rdlo12rdhi16rn0rm8_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
emulate_rdlo12rdhi16rn0rm8_rwflags_nopc(kprobe_opcode_t insn,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rdlo = (insn >> 12) & 0xf;
int rdhi = (insn >> 16) & 0xf;
int rn = insn & 0xf;
@ -291,7 +292,7 @@ emulate_rdlo12rdhi16rn0rm8_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdlov), "=r" (rdhiv), [cpsr] "=r" (cpsr)
: "0" (rdlov), "1" (rdhiv), "r" (rnv), "r" (rmv),
"2" (cpsr), [fn] "r" (p->ainsn.insn_fn)
"2" (cpsr), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);

40
arch/arm/kernel/kprobes-common.c
View File

@ -17,9 +17,10 @@
#include "kprobes.h"
static void __kprobes simulate_ldm1stm1(struct kprobe *p, struct pt_regs *regs)
static void __kprobes simulate_ldm1stm1(kprobe_opcode_t insn,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rn = (insn >> 16) & 0xf;
int lbit = insn & (1 << 20);
int wbit = insn & (1 << 21);
@ -58,24 +59,31 @@ static void __kprobes simulate_ldm1stm1(struct kprobe *p, struct pt_regs *regs)
}
}
static void __kprobes simulate_stm1_pc(struct kprobe *p, struct pt_regs *regs)
static void __kprobes simulate_stm1_pc(kprobe_opcode_t insn,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
regs->ARM_pc = (long)p->addr + str_pc_offset;
simulate_ldm1stm1(p, regs);
regs->ARM_pc = (long)p->addr + 4;
unsigned long addr = regs->ARM_pc - 4;
regs->ARM_pc = (long)addr + str_pc_offset;
simulate_ldm1stm1(insn, asi, regs);
regs->ARM_pc = (long)addr + 4;
}
static void __kprobes simulate_ldm1_pc(struct kprobe *p, struct pt_regs *regs)
static void __kprobes simulate_ldm1_pc(kprobe_opcode_t insn,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
simulate_ldm1stm1(p, regs);
simulate_ldm1stm1(insn, asi, regs);
load_write_pc(regs->ARM_pc, regs);
}
static void __kprobes
emulate_generic_r0_12_noflags(struct kprobe *p, struct pt_regs *regs)
emulate_generic_r0_12_noflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
register void *rregs asm("r1") = regs;
register void *rfn asm("lr") = p->ainsn.insn_fn;
register void *rfn asm("lr") = asi->insn_fn;
__asm__ __volatile__ (
"stmdb sp!, {%[regs], r11} \n\t"
@ -99,15 +107,19 @@ emulate_generic_r0_12_noflags(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
emulate_generic_r2_14_noflags(struct kprobe *p, struct pt_regs *regs)
emulate_generic_r2_14_noflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
emulate_generic_r0_12_noflags(p, (struct pt_regs *)(regs->uregs+2));
emulate_generic_r0_12_noflags(insn, asi,
(struct pt_regs *)(regs->uregs+2));
}
static void __kprobes
emulate_ldm_r3_15(struct kprobe *p, struct pt_regs *regs)
emulate_ldm_r3_15(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
emulate_generic_r0_12_noflags(p, (struct pt_regs *)(regs->uregs+3));
emulate_generic_r0_12_noflags(insn, asi,
(struct pt_regs *)(regs->uregs+3));
load_write_pc(regs->ARM_pc, regs);
}

175
arch/arm/kernel/kprobes-thumb.c
View File

@ -20,24 +20,13 @@
#define t32_emulate_rd8rn16rm0ra12_noflags \
t32_emulate_rdlo12rdhi8rn16rm0_noflags
/*
* Return the PC value for a probe in thumb code.
* This is the address of the probed instruction plus 4.
* We subtract one because the address will have bit zero set to indicate
* a pointer to thumb code.
*/
static inline unsigned long __kprobes thumb_probe_pc(struct kprobe *p)
{
return (unsigned long)p->addr - 1 + 4;
}
/* t32 thumb actions */
static void __kprobes
t32_simulate_table_branch(struct kprobe *p, struct pt_regs *regs)
t32_simulate_table_branch(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -54,19 +43,19 @@ t32_simulate_table_branch(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_simulate_mrs(struct kprobe *p, struct pt_regs *regs)
t32_simulate_mrs(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 8) & 0xf;
unsigned long mask = 0xf8ff03df; /* Mask out execution state */
regs->uregs[rd] = regs->ARM_cpsr & mask;
}
static void __kprobes
t32_simulate_cond_branch(struct kprobe *p, struct pt_regs *regs)
t32_simulate_cond_branch(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc;
long offset = insn & 0x7ff; /* imm11 */
offset += (insn & 0x003f0000) >> 5; /* imm6 */
@ -88,10 +77,10 @@ t32_decode_cond_branch(kprobe_opcode_t insn, struct arch_specific_insn *asi,
}
static void __kprobes
t32_simulate_branch(struct kprobe *p, struct pt_regs *regs)
t32_simulate_branch(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc;
long offset = insn & 0x7ff; /* imm11 */
offset += (insn & 0x03ff0000) >> 5; /* imm10 */
@ -104,7 +93,7 @@ t32_simulate_branch(struct kprobe *p, struct pt_regs *regs)
if (insn & (1 << 14)) {
/* BL or BLX */
regs->ARM_lr = (unsigned long)p->addr + 4;
regs->ARM_lr = regs->ARM_pc | 1;
if (!(insn & (1 << 12))) {
/* BLX so switch to ARM mode */
regs->ARM_cpsr &= ~PSR_T_BIT;
@ -116,10 +105,10 @@ t32_simulate_branch(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_simulate_ldr_literal(struct kprobe *p, struct pt_regs *regs)
t32_simulate_ldr_literal(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long addr = thumb_probe_pc(p) & ~3;
unsigned long addr = regs->ARM_pc & ~3;
int rt = (insn >> 12) & 0xf;
unsigned long rtv;
@ -168,10 +157,10 @@ t32_decode_ldmstm(kprobe_opcode_t insn, struct arch_specific_insn *asi,
}
static void __kprobes
t32_emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
t32_emulate_ldrdstrd(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p) & ~3;
unsigned long pc = regs->ARM_pc & ~3;
int rt1 = (insn >> 12) & 0xf;
int rt2 = (insn >> 8) & 0xf;
int rn = (insn >> 16) & 0xf;
@ -184,7 +173,7 @@ t32_emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
"blx %[fn]"
: "=r" (rt1v), "=r" (rt2v), "=r" (rnv)
: "0" (rt1v), "1" (rt2v), "2" (rnv), [fn] "r" (p->ainsn.insn_fn)
: "0" (rt1v), "1" (rt2v), "2" (rnv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -195,9 +184,9 @@ t32_emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_emulate_ldrstr(struct kprobe *p, struct pt_regs *regs)
t32_emulate_ldrstr(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -209,7 +198,7 @@ t32_emulate_ldrstr(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
"blx %[fn]"
: "=r" (rtv), "=r" (rnv)
: "0" (rtv), "1" (rnv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
: "0" (rtv), "1" (rnv), "r" (rmv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -221,9 +210,9 @@ t32_emulate_ldrstr(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_emulate_rd8rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
t32_emulate_rd8rn16rm0_rwflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 8) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
@ -239,7 +228,7 @@ t32_emulate_rd8rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv),
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
"1" (cpsr), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -248,10 +237,10 @@ t32_emulate_rd8rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_emulate_rd8pc16_noflags(struct kprobe *p, struct pt_regs *regs)
t32_emulate_rd8pc16_noflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc;
int rd = (insn >> 8) & 0xf;
register unsigned long rdv asm("r1") = regs->uregs[rd];
@ -260,7 +249,7 @@ t32_emulate_rd8pc16_noflags(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
"blx %[fn]"
: "=r" (rdv)
: "0" (rdv), "r" (rnv), [fn] "r" (p->ainsn.insn_fn)
: "0" (rdv), "r" (rnv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -268,9 +257,9 @@ t32_emulate_rd8pc16_noflags(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_emulate_rd8rn16_noflags(struct kprobe *p, struct pt_regs *regs)
t32_emulate_rd8rn16_noflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 8) & 0xf;
int rn = (insn >> 16) & 0xf;
@ -280,7 +269,7 @@ t32_emulate_rd8rn16_noflags(struct kprobe *p, struct pt_regs *regs)
__asm__ __volatile__ (
"blx %[fn]"
: "=r" (rdv)
: "0" (rdv), "r" (rnv), [fn] "r" (p->ainsn.insn_fn)
: "0" (rdv), "r" (rnv), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -288,9 +277,10 @@ t32_emulate_rd8rn16_noflags(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t32_emulate_rdlo12rdhi8rn16rm0_noflags(struct kprobe *p, struct pt_regs *regs)
t32_emulate_rdlo12rdhi8rn16rm0_noflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rdlo = (insn >> 12) & 0xf;
int rdhi = (insn >> 8) & 0xf;
int rn = (insn >> 16) & 0xf;
@ -305,7 +295,7 @@ t32_emulate_rdlo12rdhi8rn16rm0_noflags(struct kprobe *p, struct pt_regs *regs)
"blx %[fn]"
: "=r" (rdlov), "=r" (rdhiv)
: "0" (rdlov), "1" (rdhiv), "r" (rnv), "r" (rmv),
[fn] "r" (p->ainsn.insn_fn)
[fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -315,33 +305,33 @@ t32_emulate_rdlo12rdhi8rn16rm0_noflags(struct kprobe *p, struct pt_regs *regs)
/* t16 thumb actions */
static void __kprobes
t16_simulate_bxblx(struct kprobe *p, struct pt_regs *regs)
t16_simulate_bxblx(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc + 2;
int rm = (insn >> 3) & 0xf;
unsigned long rmv = (rm == 15) ? pc : regs->uregs[rm];
if (insn & (1 << 7)) /* BLX ? */
regs->ARM_lr = (unsigned long)p->addr + 2;
regs->ARM_lr = regs->ARM_pc | 1;
bx_write_pc(rmv, regs);
}
static void __kprobes
t16_simulate_ldr_literal(struct kprobe *p, struct pt_regs *regs)
t16_simulate_ldr_literal(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long* base = (unsigned long *)(thumb_probe_pc(p) & ~3);
unsigned long *base = (unsigned long *)((regs->ARM_pc + 2) & ~3);
long index = insn & 0xff;
int rt = (insn >> 8) & 0x7;
regs->uregs[rt] = base[index];
}
static void __kprobes
t16_simulate_ldrstr_sp_relative(struct kprobe *p, struct pt_regs *regs)
t16_simulate_ldrstr_sp_relative(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long* base = (unsigned long *)regs->ARM_sp;
long index = insn & 0xff;
int rt = (insn >> 8) & 0x7;
@ -352,20 +342,20 @@ t16_simulate_ldrstr_sp_relative(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t16_simulate_reladr(struct kprobe *p, struct pt_regs *regs)
t16_simulate_reladr(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long base = (insn & 0x800) ? regs->ARM_sp
: (thumb_probe_pc(p) & ~3);
: ((regs->ARM_pc + 2) & ~3);
long offset = insn & 0xff;
int rt = (insn >> 8) & 0x7;
regs->uregs[rt] = base + offset * 4;
}
static void __kprobes
t16_simulate_add_sp_imm(struct kprobe *p, struct pt_regs *regs)
t16_simulate_add_sp_imm(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
long imm = insn & 0x7f;
if (insn & 0x80) /* SUB */
regs->ARM_sp -= imm * 4;
@ -374,21 +364,22 @@ t16_simulate_add_sp_imm(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t16_simulate_cbz(struct kprobe *p, struct pt_regs *regs)
t16_simulate_cbz(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rn = insn & 0x7;
kprobe_opcode_t nonzero = regs->uregs[rn] ? insn : ~insn;
if (nonzero & 0x800) {
long i = insn & 0x200;
long imm5 = insn & 0xf8;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc + 2;
regs->ARM_pc = pc + (i >> 3) + (imm5 >> 2);
}
}
static void __kprobes
t16_simulate_it(struct kprobe *p, struct pt_regs *regs)
t16_simulate_it(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
/*
* The 8 IT state bits are split into two parts in CPSR:
@ -396,7 +387,6 @@ t16_simulate_it(struct kprobe *p, struct pt_regs *regs)
* ITSTATE<7:2> are in CPSR<15:10>
* The new IT state is in the lower byte of insn.
*/
kprobe_opcode_t insn = p->opcode;
unsigned long cpsr = regs->ARM_cpsr;
cpsr &= ~PSR_IT_MASK;
cpsr |= (insn & 0xfc) << 8;
@ -405,10 +395,11 @@ t16_simulate_it(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t16_singlestep_it(struct kprobe *p, struct pt_regs *regs)
t16_singlestep_it(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
regs->ARM_pc += 2;
t16_simulate_it(p, regs);
t16_simulate_it(insn, asi, regs);
}
static enum kprobe_insn __kprobes
@ -420,10 +411,10 @@ t16_decode_it(kprobe_opcode_t insn, struct arch_specific_insn *asi,
}
static void __kprobes
t16_simulate_cond_branch(struct kprobe *p, struct pt_regs *regs)
t16_simulate_cond_branch(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc + 2;
long offset = insn & 0x7f;
offset -= insn & 0x80; /* Apply sign bit */
regs->ARM_pc = pc + (offset * 2);
@ -440,17 +431,18 @@ t16_decode_cond_branch(kprobe_opcode_t insn, struct arch_specific_insn *asi,
}
static void __kprobes
t16_simulate_branch(struct kprobe *p, struct pt_regs *regs)
t16_simulate_branch(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc + 2;
long offset = insn & 0x3ff;
offset -= insn & 0x400; /* Apply sign bit */
regs->ARM_pc = pc + (offset * 2);
}
static unsigned long __kprobes
t16_emulate_loregs(struct kprobe *p, struct pt_regs *regs)
t16_emulate_loregs(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
unsigned long oldcpsr = regs->ARM_cpsr;
unsigned long newcpsr;
@ -463,7 +455,7 @@ t16_emulate_loregs(struct kprobe *p, struct pt_regs *regs)
"mrs %[newcpsr], cpsr \n\t"
: [newcpsr] "=r" (newcpsr)
: [oldcpsr] "r" (oldcpsr), [regs] "r" (regs),
[fn] "r" (p->ainsn.insn_fn)
[fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"lr", "memory", "cc"
);
@ -472,24 +464,26 @@ t16_emulate_loregs(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
t16_emulate_loregs_rwflags(struct kprobe *p, struct pt_regs *regs)
t16_emulate_loregs_rwflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
regs->ARM_cpsr = t16_emulate_loregs(p, regs);
regs->ARM_cpsr = t16_emulate_loregs(insn, asi, regs);
}
static void __kprobes
t16_emulate_loregs_noitrwflags(struct kprobe *p, struct pt_regs *regs)
t16_emulate_loregs_noitrwflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
unsigned long cpsr = t16_emulate_loregs(p, regs);
unsigned long cpsr = t16_emulate_loregs(insn, asi, regs);
if (!in_it_block(cpsr))
regs->ARM_cpsr = cpsr;
}
static void __kprobes
t16_emulate_hiregs(struct kprobe *p, struct pt_regs *regs)
t16_emulate_hiregs(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = thumb_probe_pc(p);
unsigned long pc = regs->ARM_pc + 2;
int rdn = (insn & 0x7) | ((insn & 0x80) >> 4);
int rm = (insn >> 3) & 0xf;
@ -505,7 +499,7 @@ t16_emulate_hiregs(struct kprobe *p, struct pt_regs *regs)
"blx %[fn] \n\t"
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdnv), [cpsr] "=r" (cpsr)
: "0" (rdnv), "r" (rmv), "1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
: "0" (rdnv), "r" (rmv), "1" (cpsr), [fn] "r" (asi->insn_fn)
: "lr", "memory", "cc"
);
@ -528,7 +522,8 @@ t16_decode_hiregs(kprobe_opcode_t insn, struct arch_specific_insn *asi,
}
static void __kprobes
t16_emulate_push(struct kprobe *p, struct pt_regs *regs)
t16_emulate_push(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
__asm__ __volatile__ (
"ldr r9, [%[regs], #13*4] \n\t"
@ -537,7 +532,7 @@ t16_emulate_push(struct kprobe *p, struct pt_regs *regs)
"blx %[fn] \n\t"
"str r9, [%[regs], #13*4] \n\t"
:
: [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
"lr", "memory", "cc"
);
@ -559,7 +554,8 @@ t16_decode_push(kprobe_opcode_t insn, struct arch_specific_insn *asi,
}
static void __kprobes
t16_emulate_pop_nopc(struct kprobe *p, struct pt_regs *regs)
t16_emulate_pop_nopc(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
__asm__ __volatile__ (
"ldr r9, [%[regs], #13*4] \n\t"
@ -568,14 +564,15 @@ t16_emulate_pop_nopc(struct kprobe *p, struct pt_regs *regs)
"stmia %[regs], {r0-r7} \n\t"
"str r9, [%[regs], #13*4] \n\t"
:
: [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
"lr", "memory", "cc"
);
}
static void __kprobes
t16_emulate_pop_pc(struct kprobe *p, struct pt_regs *regs)
t16_emulate_pop_pc(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
register unsigned long pc asm("r8");
@ -586,7 +583,7 @@ t16_emulate_pop_pc(struct kprobe *p, struct pt_regs *regs)
"stmia %[regs], {r0-r7} \n\t"
"str r9, [%[regs], #13*4] \n\t"
: "=r" (pc)
: [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
"lr", "memory", "cc"
);

2
arch/arm/kernel/kprobes.c
View File

@ -204,7 +204,7 @@ singlestep_skip(struct kprobe *p, struct pt_regs *regs)
static inline void __kprobes
singlestep(struct kprobe *p, struct pt_regs *regs, struct kprobe_ctlblk *kcb)
{
p->ainsn.insn_singlestep(p, regs);
p->ainsn.insn_singlestep(p->opcode, &p->ainsn, regs);
}
/*

33
arch/arm/kernel/probes-arm.c
View File

@ -19,9 +19,8 @@
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/ptrace.h>
#include <linux/kprobes.h>
#include "kprobes.h"
#include "probes.h"
#include "probes-arm.h"
#define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit)))))
@ -58,10 +57,10 @@
* read and write of flags.
*/
void __kprobes simulate_bbl(struct kprobe *p, struct pt_regs *regs)
void __kprobes simulate_bbl(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
long iaddr = (long)p->addr;
long iaddr = (long) regs->ARM_pc - 4;
int disp = branch_displacement(insn);
if (insn & (1 << 24))
@ -70,10 +69,10 @@ void __kprobes simulate_bbl(struct kprobe *p, struct pt_regs *regs)
regs->ARM_pc = iaddr + 8 + disp;
}
void __kprobes simulate_blx1(struct kprobe *p, struct pt_regs *regs)
void __kprobes simulate_blx1(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
long iaddr = (long)p->addr;
long iaddr = (long) regs->ARM_pc - 4;
int disp = branch_displacement(insn);
regs->ARM_lr = iaddr + 4;
@ -81,14 +80,14 @@ void __kprobes simulate_blx1(struct kprobe *p, struct pt_regs *regs)
regs->ARM_cpsr |= PSR_T_BIT;
}
void __kprobes simulate_blx2bx(struct kprobe *p, struct pt_regs *regs)
void __kprobes simulate_blx2bx(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rm = insn & 0xf;
long rmv = regs->uregs[rm];
if (insn & (1 << 5))
regs->ARM_lr = (long)p->addr + 4;
regs->ARM_lr = (long) regs->ARM_pc;
regs->ARM_pc = rmv & ~0x1;
regs->ARM_cpsr &= ~PSR_T_BIT;
@ -96,15 +95,16 @@ void __kprobes simulate_blx2bx(struct kprobe *p, struct pt_regs *regs)
regs->ARM_cpsr |= PSR_T_BIT;
}
void __kprobes simulate_mrs(struct kprobe *p, struct pt_regs *regs)
void __kprobes simulate_mrs(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 12) & 0xf;
unsigned long mask = 0xf8ff03df; /* Mask out execution state */
regs->uregs[rd] = regs->ARM_cpsr & mask;
}
void __kprobes simulate_mov_ipsp(struct kprobe *p, struct pt_regs *regs)
void __kprobes simulate_mov_ipsp(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
regs->uregs[12] = regs->uregs[13];
}
@ -704,10 +704,11 @@ const union decode_item kprobe_decode_arm_table[] = {
EXPORT_SYMBOL_GPL(kprobe_decode_arm_table);
#endif
static void __kprobes arm_singlestep(struct kprobe *p, struct pt_regs *regs)
static void __kprobes arm_singlestep(kprobe_opcode_t insn,
struct arch_specific_insn *asi, struct pt_regs *regs)
{
regs->ARM_pc += 4;
p->ainsn.insn_handler(p, regs);
asi->insn_handler(insn, asi, regs);
}
/* Return:

15
arch/arm/kernel/probes-arm.h
View File

@ -53,10 +53,15 @@ enum probes_arm_action {
NUM_PROBES_ARM_ACTIONS
};
void __kprobes simulate_bbl(struct kprobe *p, struct pt_regs *regs);
void __kprobes simulate_blx1(struct kprobe *p, struct pt_regs *regs);
void __kprobes simulate_blx2bx(struct kprobe *p, struct pt_regs *regs);
void __kprobes simulate_mrs(struct kprobe *p, struct pt_regs *regs);
void __kprobes simulate_mov_ipsp(struct kprobe *p, struct pt_regs *regs);
void __kprobes simulate_bbl(kprobe_opcode_t opcode,
struct arch_specific_insn *asi, struct pt_regs *regs);
void __kprobes simulate_blx1(kprobe_opcode_t opcode,
struct arch_specific_insn *asi, struct pt_regs *regs);
void __kprobes simulate_blx2bx(kprobe_opcode_t opcode,
struct arch_specific_insn *asi, struct pt_regs *regs);
void __kprobes simulate_mrs(kprobe_opcode_t opcode,
struct arch_specific_insn *asi, struct pt_regs *regs);
void __kprobes simulate_mov_ipsp(kprobe_opcode_t opcode,
struct arch_specific_insn *asi, struct pt_regs *regs);
#endif

15
arch/arm/kernel/probes-thumb.c
View File

@ -10,10 +10,9 @@
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/kprobes.h>
#include <linux/module.h>
#include "kprobes.h"
#include "probes.h"
#include "probes-thumb.h"
@ -844,17 +843,21 @@ static unsigned long __kprobes thumb_check_cc(unsigned long cpsr)
return true;
}
static void __kprobes thumb16_singlestep(struct kprobe *p, struct pt_regs *regs)
static void __kprobes thumb16_singlestep(kprobe_opcode_t opcode,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
regs->ARM_pc += 2;
p->ainsn.insn_handler(p, regs);
asi->insn_handler(opcode, asi, regs);
regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
}
static void __kprobes thumb32_singlestep(struct kprobe *p, struct pt_regs *regs)
static void __kprobes thumb32_singlestep(kprobe_opcode_t opcode,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
regs->ARM_pc += 4;
p->ainsn.insn_handler(p, regs);
asi->insn_handler(opcode, asi, regs);
regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
}

13
arch/arm/kernel/probes.c
View File

@ -13,12 +13,11 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/kprobes.h>
#include <asm/system_info.h>
#include <asm/ptrace.h>
#include <linux/bug.h>
#include "kprobes.h"
#include "probes.h"
#ifndef find_str_pc_offset
@ -176,13 +175,17 @@ kprobe_check_cc * const kprobe_condition_checks[16] = {
};
void __kprobes kprobe_simulate_nop(struct kprobe *p, struct pt_regs *regs)
void __kprobes kprobe_simulate_nop(kprobe_opcode_t opcode,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
}
void __kprobes kprobe_emulate_none(struct kprobe *p, struct pt_regs *regs)
void __kprobes kprobe_emulate_none(kprobe_opcode_t opcode,
struct arch_specific_insn *asi,
struct pt_regs *regs)
{
p->ainsn.insn_fn();
asi->insn_fn();
}
/*

8
arch/arm/kernel/probes.h
View File

@ -22,6 +22,7 @@
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/kprobes.h>
#include "kprobes.h"
#if __LINUX_ARM_ARCH__ >= 7
@ -37,6 +38,7 @@ void __init find_str_pc_offset(void);
#endif
struct decode_header;
/*
* Update ITSTATE after normal execution of an IT block instruction.
@ -129,8 +131,10 @@ static inline void __kprobes alu_write_pc(long pcv, struct pt_regs *regs)
}
void __kprobes kprobe_simulate_nop(struct kprobe *p, struct pt_regs *regs);
void __kprobes kprobe_emulate_none(struct kprobe *p, struct pt_regs *regs);
void __kprobes kprobe_simulate_nop(kprobe_opcode_t, struct arch_specific_insn *,
struct pt_regs *regs);
void __kprobes kprobe_emulate_none(kprobe_opcode_t, struct arch_specific_insn *,
struct pt_regs *regs);
enum kprobe_insn __kprobes
kprobe_decode_ldmstm(kprobe_opcode_t insn, struct arch_specific_insn *asi,