mirror of https://gitee.com/openkylin/linux.git
uprobes/core: Move insn to arch specific structure
Few cleanups suggested by Ingo Molnar. - Rename struct uprobe_arch_info to struct arch_uprobe. - Move insn from struct uprobe to struct arch_uprobe. - Make arch specific uprobe functions to accept struct arch_uprobe instead of struct uprobe. - Move struct uprobe to kernel/uprobes.c from include/linux/uprobes.h Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Anton Arapov <anton@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Josh Stone <jistone@redhat.com> Link: http://lkml.kernel.org/r/20120222091602.15880.40249.sendpatchset@srdronam.in.ibm.com [ Made various small improvements ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Srikar Dronamraju
Ingo Molnar
parent
96379f6007
commit
3ff54efdfa
|
|
@ -31,13 +31,13 @@ typedef u8 uprobe_opcode_t;
|
|||
#define UPROBES_BKPT_INSN 0xcc
|
||||
#define UPROBES_BKPT_INSN_SIZE 1
|
||||
|
||||
struct uprobe_arch_info {
|
||||
struct arch_uprobe {
|
||||
u16 fixups;
|
||||
u8 insn[MAX_UINSN_BYTES];
|
||||
#ifdef CONFIG_X86_64
|
||||
unsigned long rip_rela_target_address;
|
||||
#endif
|
||||
};
|
||||
|
||||
struct uprobe;
|
||||
extern int arch_uprobes_analyze_insn(struct mm_struct *mm, struct uprobe *uprobe);
|
||||
extern int arch_uprobes_analyze_insn(struct mm_struct *mm, struct arch_uprobe *arch_uprobe);
|
||||
#endif /* _ASM_UPROBES_H */
|
||||
|
|
|
|||
|
|
@ -200,9 +200,9 @@ static bool is_prefix_bad(struct insn *insn)
|
|||
return false;
|
||||
}
|
||||
|
||||
static int validate_insn_32bits(struct uprobe *uprobe, struct insn *insn)
|
||||
static int validate_insn_32bits(struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
insn_init(insn, uprobe->insn, false);
|
||||
insn_init(insn, auprobe->insn, false);
|
||||
|
||||
/* Skip good instruction prefixes; reject "bad" ones. */
|
||||
insn_get_opcode(insn);
|
||||
|
|
@ -222,11 +222,11 @@ static int validate_insn_32bits(struct uprobe *uprobe, struct insn *insn)
|
|||
|
||||
/*
|
||||
* Figure out which fixups post_xol() will need to perform, and annotate
|
||||
* uprobe->arch_info.fixups accordingly. To start with,
|
||||
* uprobe->arch_info.fixups is either zero or it reflects rip-related
|
||||
* arch_uprobe->fixups accordingly. To start with,
|
||||
* arch_uprobe->fixups is either zero or it reflects rip-related
|
||||
* fixups.
|
||||
*/
|
||||
static void prepare_fixups(struct uprobe *uprobe, struct insn *insn)
|
||||
static void prepare_fixups(struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
bool fix_ip = true, fix_call = false; /* defaults */
|
||||
int reg;
|
||||
|
|
@ -269,17 +269,17 @@ static void prepare_fixups(struct uprobe *uprobe, struct insn *insn)
|
|||
break;
|
||||
}
|
||||
if (fix_ip)
|
||||
uprobe->arch_info.fixups |= UPROBES_FIX_IP;
|
||||
auprobe->fixups |= UPROBES_FIX_IP;
|
||||
if (fix_call)
|
||||
uprobe->arch_info.fixups |= UPROBES_FIX_CALL;
|
||||
auprobe->fixups |= UPROBES_FIX_CALL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/*
|
||||
* If uprobe->insn doesn't use rip-relative addressing, return
|
||||
* If arch_uprobe->insn doesn't use rip-relative addressing, return
|
||||
* immediately. Otherwise, rewrite the instruction so that it accesses
|
||||
* its memory operand indirectly through a scratch register. Set
|
||||
* uprobe->arch_info.fixups and uprobe->arch_info.rip_rela_target_address
|
||||
* arch_uprobe->fixups and arch_uprobe->rip_rela_target_address
|
||||
* accordingly. (The contents of the scratch register will be saved
|
||||
* before we single-step the modified instruction, and restored
|
||||
* afterward.)
|
||||
|
|
@ -297,7 +297,7 @@ static void prepare_fixups(struct uprobe *uprobe, struct insn *insn)
|
|||
* - There's never a SIB byte.
|
||||
* - The displacement is always 4 bytes.
|
||||
*/
|
||||
static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
|
||||
static void handle_riprel_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
u8 *cursor;
|
||||
u8 reg;
|
||||
|
|
@ -305,7 +305,7 @@ static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, stru
|
|||
if (mm->context.ia32_compat)
|
||||
return;
|
||||
|
||||
uprobe->arch_info.rip_rela_target_address = 0x0;
|
||||
auprobe->rip_rela_target_address = 0x0;
|
||||
if (!insn_rip_relative(insn))
|
||||
return;
|
||||
|
||||
|
|
@ -315,7 +315,7 @@ static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, stru
|
|||
* we want to encode rax/rcx, not r8/r9.
|
||||
*/
|
||||
if (insn->rex_prefix.nbytes) {
|
||||
cursor = uprobe->insn + insn_offset_rex_prefix(insn);
|
||||
cursor = auprobe->insn + insn_offset_rex_prefix(insn);
|
||||
*cursor &= 0xfe; /* Clearing REX.B bit */
|
||||
}
|
||||
|
||||
|
|
@ -324,7 +324,7 @@ static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, stru
|
|||
* displacement. Beyond the displacement, for some instructions,
|
||||
* is the immediate operand.
|
||||
*/
|
||||
cursor = uprobe->insn + insn_offset_modrm(insn);
|
||||
cursor = auprobe->insn + insn_offset_modrm(insn);
|
||||
insn_get_length(insn);
|
||||
|
||||
/*
|
||||
|
|
@ -341,18 +341,18 @@ static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, stru
|
|||
* is NOT the register operand, so we use %rcx (register
|
||||
* #1) for the scratch register.
|
||||
*/
|
||||
uprobe->arch_info.fixups = UPROBES_FIX_RIP_CX;
|
||||
auprobe->fixups = UPROBES_FIX_RIP_CX;
|
||||
/* Change modrm from 00 000 101 to 00 000 001. */
|
||||
*cursor = 0x1;
|
||||
} else {
|
||||
/* Use %rax (register #0) for the scratch register. */
|
||||
uprobe->arch_info.fixups = UPROBES_FIX_RIP_AX;
|
||||
auprobe->fixups = UPROBES_FIX_RIP_AX;
|
||||
/* Change modrm from 00 xxx 101 to 00 xxx 000 */
|
||||
*cursor = (reg << 3);
|
||||
}
|
||||
|
||||
/* Target address = address of next instruction + (signed) offset */
|
||||
uprobe->arch_info.rip_rela_target_address = (long)insn->length + insn->displacement.value;
|
||||
auprobe->rip_rela_target_address = (long)insn->length + insn->displacement.value;
|
||||
|
||||
/* Displacement field is gone; slide immediate field (if any) over. */
|
||||
if (insn->immediate.nbytes) {
|
||||
|
|
@ -362,9 +362,9 @@ static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, stru
|
|||
return;
|
||||
}
|
||||
|
||||
static int validate_insn_64bits(struct uprobe *uprobe, struct insn *insn)
|
||||
static int validate_insn_64bits(struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
insn_init(insn, uprobe->insn, true);
|
||||
insn_init(insn, auprobe->insn, true);
|
||||
|
||||
/* Skip good instruction prefixes; reject "bad" ones. */
|
||||
insn_get_opcode(insn);
|
||||
|
|
@ -381,42 +381,42 @@ static int validate_insn_64bits(struct uprobe *uprobe, struct insn *insn)
|
|||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
static int validate_insn_bits(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
|
||||
static int validate_insn_bits(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
if (mm->context.ia32_compat)
|
||||
return validate_insn_32bits(uprobe, insn);
|
||||
return validate_insn_64bits(uprobe, insn);
|
||||
return validate_insn_32bits(auprobe, insn);
|
||||
return validate_insn_64bits(auprobe, insn);
|
||||
}
|
||||
#else /* 32-bit: */
|
||||
static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
|
||||
static void handle_riprel_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
/* No RIP-relative addressing on 32-bit */
|
||||
}
|
||||
|
||||
static int validate_insn_bits(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
|
||||
static int validate_insn_bits(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
|
||||
{
|
||||
return validate_insn_32bits(uprobe, insn);
|
||||
return validate_insn_32bits(auprobe, insn);
|
||||
}
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
/**
|
||||
* arch_uprobes_analyze_insn - instruction analysis including validity and fixups.
|
||||
* @mm: the probed address space.
|
||||
* @uprobe: the probepoint information.
|
||||
* @arch_uprobe: the probepoint information.
|
||||
* Return 0 on success or a -ve number on error.
|
||||
*/
|
||||
int arch_uprobes_analyze_insn(struct mm_struct *mm, struct uprobe *uprobe)
|
||||
int arch_uprobes_analyze_insn(struct mm_struct *mm, struct arch_uprobe *auprobe)
|
||||
{
|
||||
int ret;
|
||||
struct insn insn;
|
||||
|
||||
uprobe->arch_info.fixups = 0;
|
||||
ret = validate_insn_bits(mm, uprobe, &insn);
|
||||
auprobe->fixups = 0;
|
||||
ret = validate_insn_bits(mm, auprobe, &insn);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
handle_riprel_insn(mm, uprobe, &insn);
|
||||
prepare_fixups(uprobe, &insn);
|
||||
handle_riprel_insn(mm, auprobe, &insn);
|
||||
prepare_fixups(auprobe, &insn);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -29,12 +29,6 @@
|
|||
struct vm_area_struct;
|
||||
#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
|
||||
#include <asm/uprobes.h>
|
||||
#else
|
||||
|
||||
typedef u8 uprobe_opcode_t;
|
||||
struct uprobe_arch_info {};
|
||||
|
||||
#define MAX_UINSN_BYTES 4
|
||||
#endif
|
||||
|
||||
/* flags that denote/change uprobes behaviour */
|
||||
|
|
@ -56,22 +50,9 @@ struct uprobe_consumer {
|
|||
struct uprobe_consumer *next;
|
||||
};
|
||||
|
||||
struct uprobe {
|
||||
struct rb_node rb_node; /* node in the rb tree */
|
||||
atomic_t ref;
|
||||
struct rw_semaphore consumer_rwsem;
|
||||
struct list_head pending_list;
|
||||
struct uprobe_arch_info arch_info;
|
||||
struct uprobe_consumer *consumers;
|
||||
struct inode *inode; /* Also hold a ref to inode */
|
||||
loff_t offset;
|
||||
int flags;
|
||||
u8 insn[MAX_UINSN_BYTES];
|
||||
};
|
||||
|
||||
#ifdef CONFIG_UPROBES
|
||||
extern int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr);
|
||||
extern int __weak set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr, bool verify);
|
||||
extern int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr);
|
||||
extern int __weak set_orig_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr, bool verify);
|
||||
extern bool __weak is_bkpt_insn(uprobe_opcode_t *insn);
|
||||
extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
|
||||
extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
|
||||
|
|
|
|||
|
|
@ -65,6 +65,18 @@ struct vma_info {
|
|||
loff_t vaddr;
|
||||
};
|
||||
|
||||
struct uprobe {
|
||||
struct rb_node rb_node; /* node in the rb tree */
|
||||
atomic_t ref;
|
||||
struct rw_semaphore consumer_rwsem;
|
||||
struct list_head pending_list;
|
||||
struct uprobe_consumer *consumers;
|
||||
struct inode *inode; /* Also hold a ref to inode */
|
||||
loff_t offset;
|
||||
int flags;
|
||||
struct arch_uprobe arch;
|
||||
};
|
||||
|
||||
/*
|
||||
* valid_vma: Verify if the specified vma is an executable vma
|
||||
* Relax restrictions while unregistering: vm_flags might have
|
||||
|
|
@ -180,7 +192,7 @@ bool __weak is_bkpt_insn(uprobe_opcode_t *insn)
|
|||
/*
|
||||
* write_opcode - write the opcode at a given virtual address.
|
||||
* @mm: the probed process address space.
|
||||
* @uprobe: the breakpointing information.
|
||||
* @arch_uprobe: the breakpointing information.
|
||||
* @vaddr: the virtual address to store the opcode.
|
||||
* @opcode: opcode to be written at @vaddr.
|
||||
*
|
||||
|
|
@ -190,13 +202,14 @@ bool __weak is_bkpt_insn(uprobe_opcode_t *insn)
|
|||
* For mm @mm, write the opcode at @vaddr.
|
||||
* Return 0 (success) or a negative errno.
|
||||
*/
|
||||
static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
static int write_opcode(struct mm_struct *mm, struct arch_uprobe *auprobe,
|
||||
unsigned long vaddr, uprobe_opcode_t opcode)
|
||||
{
|
||||
struct page *old_page, *new_page;
|
||||
struct address_space *mapping;
|
||||
void *vaddr_old, *vaddr_new;
|
||||
struct vm_area_struct *vma;
|
||||
struct uprobe *uprobe;
|
||||
loff_t addr;
|
||||
int ret;
|
||||
|
||||
|
|
@ -216,6 +229,7 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
|
|||
if (!valid_vma(vma, is_bkpt_insn(&opcode)))
|
||||
goto put_out;
|
||||
|
||||
uprobe = container_of(auprobe, struct uprobe, arch);
|
||||
mapping = uprobe->inode->i_mapping;
|
||||
if (mapping != vma->vm_file->f_mapping)
|
||||
goto put_out;
|
||||
|
|
@ -326,7 +340,7 @@ static int is_bkpt_at_addr(struct mm_struct *mm, unsigned long vaddr)
|
|||
* For mm @mm, store the breakpoint instruction at @vaddr.
|
||||
* Return 0 (success) or a negative errno.
|
||||
*/
|
||||
int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr)
|
||||
int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr)
|
||||
{
|
||||
int result;
|
||||
|
||||
|
|
@ -337,7 +351,7 @@ int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long v
|
|||
if (result)
|
||||
return result;
|
||||
|
||||
return write_opcode(mm, uprobe, vaddr, UPROBES_BKPT_INSN);
|
||||
return write_opcode(mm, auprobe, vaddr, UPROBES_BKPT_INSN);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -351,7 +365,7 @@ int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long v
|
|||
* Return 0 (success) or a negative errno.
|
||||
*/
|
||||
int __weak
|
||||
set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr, bool verify)
|
||||
set_orig_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr, bool verify)
|
||||
{
|
||||
if (verify) {
|
||||
int result;
|
||||
|
|
@ -363,7 +377,7 @@ set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr,
|
|||
if (result != 1)
|
||||
return result;
|
||||
}
|
||||
return write_opcode(mm, uprobe, vaddr, *(uprobe_opcode_t *)uprobe->insn);
|
||||
return write_opcode(mm, auprobe, vaddr, *(uprobe_opcode_t *)auprobe->insn);
|
||||
}
|
||||
|
||||
static int match_uprobe(struct uprobe *l, struct uprobe *r)
|
||||
|
|
@ -593,13 +607,13 @@ static int copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma, unsigned
|
|||
|
||||
/* Instruction at the page-boundary; copy bytes in second page */
|
||||
if (nbytes < bytes) {
|
||||
if (__copy_insn(mapping, vma, uprobe->insn + nbytes,
|
||||
if (__copy_insn(mapping, vma, uprobe->arch.insn + nbytes,
|
||||
bytes - nbytes, uprobe->offset + nbytes))
|
||||
return -ENOMEM;
|
||||
|
||||
bytes = nbytes;
|
||||
}
|
||||
return __copy_insn(mapping, vma, uprobe->insn, bytes, uprobe->offset);
|
||||
return __copy_insn(mapping, vma, uprobe->arch.insn, bytes, uprobe->offset);
|
||||
}
|
||||
|
||||
static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
|
|
@ -625,23 +639,23 @@ static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
|
|||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (is_bkpt_insn((uprobe_opcode_t *)uprobe->insn))
|
||||
if (is_bkpt_insn((uprobe_opcode_t *)uprobe->arch.insn))
|
||||
return -EEXIST;
|
||||
|
||||
ret = arch_uprobes_analyze_insn(mm, uprobe);
|
||||
ret = arch_uprobes_analyze_insn(mm, &uprobe->arch);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
uprobe->flags |= UPROBES_COPY_INSN;
|
||||
}
|
||||
ret = set_bkpt(mm, uprobe, addr);
|
||||
ret = set_bkpt(mm, &uprobe->arch, addr);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void remove_breakpoint(struct mm_struct *mm, struct uprobe *uprobe, loff_t vaddr)
|
||||
{
|
||||
set_orig_insn(mm, uprobe, (unsigned long)vaddr, true);
|
||||
set_orig_insn(mm, &uprobe->arch, (unsigned long)vaddr, true);
|
||||
}
|
||||
|
||||
static void delete_uprobe(struct uprobe *uprobe)
|
||||
|
|
|
|||
Loading…
Reference in New Issue