diff options
Diffstat (limited to 'arch/mips/kernel/uprobes.c')
| -rw-r--r-- | arch/mips/kernel/uprobes.c | 113 |
1 files changed, 18 insertions, 95 deletions
diff --git a/arch/mips/kernel/uprobes.c b/arch/mips/kernel/uprobes.c index 1149b30c9aeb..dbb917403131 100644 --- a/arch/mips/kernel/uprobes.c +++ b/arch/mips/kernel/uprobes.c @@ -8,71 +8,12 @@ #include <asm/branch.h> #include <asm/cpu-features.h> #include <asm/ptrace.h> -#include <asm/inst.h> + +#include "probes-common.h" static inline int insn_has_delay_slot(const union mips_instruction insn) { - switch (insn.i_format.opcode) { - /* - * jr and jalr are in r_format format. - */ - case spec_op: - switch (insn.r_format.func) { - case jalr_op: - case jr_op: - return 1; - } - break; - - /* - * This group contains: - * bltz_op, bgez_op, bltzl_op, bgezl_op, - * bltzal_op, bgezal_op, bltzall_op, bgezall_op. - */ - case bcond_op: - switch (insn.i_format.rt) { - case bltz_op: - case bltzl_op: - case bgez_op: - case bgezl_op: - case bltzal_op: - case bltzall_op: - case bgezal_op: - case bgezall_op: - case bposge32_op: - return 1; - } - break; - - /* - * These are unconditional and in j_format. - */ - case jal_op: - case j_op: - case beq_op: - case beql_op: - case bne_op: - case bnel_op: - case blez_op: /* not really i_format */ - case blezl_op: - case bgtz_op: - case bgtzl_op: - return 1; - - /* - * And now the FPA/cp1 branch instructions. - */ - case cop1_op: -#ifdef CONFIG_CPU_CAVIUM_OCTEON - case lwc2_op: /* This is bbit0 on Octeon */ - case ldc2_op: /* This is bbit032 on Octeon */ - case swc2_op: /* This is bbit1 on Octeon */ - case sdc2_op: /* This is bbit132 on Octeon */ -#endif - return 1; - } - - return 0; + return __insn_has_delay_slot(insn); } /** @@ -95,6 +36,12 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *aup, return -EINVAL; inst.word = aup->insn[0]; + + if (__insn_is_compact_branch(inst)) { + pr_notice("Uprobes for compact branches are not supported\n"); + return -EINVAL; + } + aup->ixol[0] = aup->insn[insn_has_delay_slot(inst)]; aup->ixol[1] = UPROBE_BRK_UPROBE_XOL; /* NOP */ @@ -157,7 +104,6 @@ bool is_trap_insn(uprobe_opcode_t *insn) int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs) { struct uprobe_task *utask = current->utask; - union mips_instruction insn; /* * Now find the EPC where to resume after the breakpoint has been @@ -168,10 +114,10 @@ int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs) unsigned long epc; epc = regs->cp0_epc; - __compute_return_epc_for_insn(regs, insn); + __compute_return_epc_for_insn(regs, + (union mips_instruction) aup->insn[0]); aup->resume_epc = regs->cp0_epc; } - utask->autask.saved_trap_nr = current->thread.trap_nr; current->thread.trap_nr = UPROBE_TRAP_NR; regs->cp0_epc = current->utask->xol_vaddr; @@ -257,7 +203,7 @@ unsigned long arch_uretprobe_hijack_return_addr( ra = regs->regs[31]; /* Replace the return address with the trampoline address */ - regs->regs[31] = ra; + regs->regs[31] = trampoline_vaddr; return ra; } @@ -280,40 +226,17 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, return uprobe_write_opcode(mm, vaddr, UPROBE_SWBP_INSN); } -/** - * set_orig_insn - Restore the original instruction. - * @mm: the probed process address space. - * @auprobe: arch specific probepoint information. - * @vaddr: the virtual address to insert the opcode. - * - * For mm @mm, restore the original opcode (opcode) at @vaddr. - * Return 0 (success) or a negative errno. - * - * This overrides the weak version in kernel/events/uprobes.c. - */ -int set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, - unsigned long vaddr) -{ - return uprobe_write_opcode(mm, vaddr, - *(uprobe_opcode_t *)&auprobe->orig_inst[0].word); -} - void __weak arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, void *src, unsigned long len) { - void *kaddr; + unsigned long kaddr, kstart; /* Initialize the slot */ - kaddr = kmap_atomic(page); - memcpy(kaddr + (vaddr & ~PAGE_MASK), src, len); - kunmap_atomic(kaddr); - - /* - * The MIPS version of flush_icache_range will operate safely on - * user space addresses and more importantly, it doesn't require a - * VMA argument. - */ - flush_icache_range(vaddr, vaddr + len); + kaddr = (unsigned long)kmap_atomic(page); + kstart = kaddr + (vaddr & ~PAGE_MASK); + memcpy((void *)kstart, src, len); + flush_icache_range(kstart, kstart + len); + kunmap_atomic((void *)kaddr); } /** |
