From 0026348b48fe532279e8c12b100c16c1aa991373 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Fri, 23 Aug 2019 12:07:40 +0200 Subject: exec: Factor out core logic of check_watchpoint() We want to perform the same checks in probe_write() to trigger a cpu exit before doing any modifications. We'll have to pass a PC. Signed-off-by: David Hildenbrand Reviewed-by: Richard Henderson Message-Id: <20190823100741.9621-9-david@redhat.com> [rth: Use vaddr for len, like other watchpoint functions; Move user-only stub to static inline.] Signed-off-by: Richard Henderson --- exec.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) (limited to 'exec.c') diff --git a/exec.c b/exec.c index 31fb75901f..cb6f5763dc 100644 --- a/exec.c +++ b/exec.c @@ -2789,11 +2789,10 @@ static const MemoryRegionOps notdirty_mem_ops = { }; /* Generate a debug exception if a watchpoint has been hit. */ -static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) +void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len, + MemTxAttrs attrs, int flags, uintptr_t ra) { - CPUState *cpu = current_cpu; CPUClass *cc = CPU_GET_CLASS(cpu); - target_ulong vaddr; CPUWatchpoint *wp; assert(tcg_enabled()); @@ -2804,17 +2803,17 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) cpu_interrupt(cpu, CPU_INTERRUPT_DEBUG); return; } - vaddr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset; - vaddr = cc->adjust_watchpoint_address(cpu, vaddr, len); + + addr = cc->adjust_watchpoint_address(cpu, addr, len); QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { - if (cpu_watchpoint_address_matches(wp, vaddr, len) + if (cpu_watchpoint_address_matches(wp, addr, len) && (wp->flags & flags)) { if (flags == BP_MEM_READ) { wp->flags |= BP_WATCHPOINT_HIT_READ; } else { wp->flags |= BP_WATCHPOINT_HIT_WRITE; } - wp->hitaddr = vaddr; + wp->hitaddr = MAX(addr, wp->vaddr); wp->hitattrs = attrs; if (!cpu->watchpoint_hit) { if (wp->flags & BP_CPU && @@ -2829,11 +2828,14 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) if (wp->flags & BP_STOP_BEFORE_ACCESS) { cpu->exception_index = EXCP_DEBUG; mmap_unlock(); - cpu_loop_exit(cpu); + cpu_loop_exit_restore(cpu, ra); } else { /* Force execution of one insn next time. */ cpu->cflags_next_tb = 1 | curr_cflags(); mmap_unlock(); + if (ra) { + cpu_restore_state(cpu, ra, true); + } cpu_loop_exit_noexc(cpu); } } @@ -2843,6 +2845,14 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) } } +static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) +{ + CPUState *cpu = current_cpu; + vaddr addr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset; + + cpu_check_watchpoint(cpu, addr, len, attrs, flags, 0); +} + /* Watchpoint access routines. Watchpoints are inserted using TLB tricks, so these check for a hit then pass through to the normal out-of-line phys routines. */ -- cgit v1.2.3