X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fregcache.c;h=2dfe8eaf5feb13b23bebbd8323c2fb6bd00d34da;hb=cd9629e1df1a280c19e1daaf6c1195afbab0aca9;hp=2e8b52ee751e2e80025b4f1880326415ce737e19;hpb=abf516c6931af1683d1e51203de1ca01467f9f85;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/regcache.c b/gdb/regcache.c index 2e8b52ee75..2dfe8eaf5f 100644 --- a/gdb/regcache.c +++ b/gdb/regcache.c @@ -1,6 +1,6 @@ /* Cache and manage the values of registers for GDB, the GNU debugger. - Copyright (C) 1986-2019 Free Software Foundation, Inc. + Copyright (C) 1986-2020 Free Software Foundation, Inc. This file is part of GDB. @@ -196,10 +196,11 @@ reg_buffer::reg_buffer (gdbarch *gdbarch, bool has_pseudo) } } -regcache::regcache (gdbarch *gdbarch, const address_space *aspace_) +regcache::regcache (process_stratum_target *target, gdbarch *gdbarch, + const address_space *aspace_) /* The register buffers. A read/write register cache can only hold [0 .. gdbarch_num_regs). */ - : detached_regcache (gdbarch, false), m_aspace (aspace_) + : detached_regcache (gdbarch, false), m_aspace (aspace_), m_target (target) { m_ptid = minus_one_ptid; } @@ -320,14 +321,19 @@ reg_buffer::assert_regnum (int regnum) const std::forward_list regcache::current_regcache; struct regcache * -get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch, +get_thread_arch_aspace_regcache (process_stratum_target *target, + ptid_t ptid, struct gdbarch *gdbarch, struct address_space *aspace) { + gdb_assert (target != nullptr); + for (const auto ®cache : regcache::current_regcache) - if (regcache->ptid () == ptid && regcache->arch () == gdbarch) + if (regcache->target () == target + && regcache->ptid () == ptid + && regcache->arch () == gdbarch) return regcache; - regcache *new_regcache = new regcache (gdbarch, aspace); + regcache *new_regcache = new regcache (target, gdbarch, aspace); regcache::current_regcache.push_front (new_regcache); new_regcache->set_ptid (ptid); @@ -336,26 +342,38 @@ get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch, } struct regcache * -get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch) +get_thread_arch_regcache (process_stratum_target *target, ptid_t ptid, + struct gdbarch *gdbarch) { + scoped_restore_current_inferior restore_current_inferior; + set_current_inferior (find_inferior_ptid (target, ptid)); address_space *aspace = target_thread_address_space (ptid); - return get_thread_arch_aspace_regcache (ptid, gdbarch, aspace); + return get_thread_arch_aspace_regcache (target, ptid, gdbarch, aspace); } +static process_stratum_target *current_thread_target; static ptid_t current_thread_ptid; static struct gdbarch *current_thread_arch; struct regcache * -get_thread_regcache (ptid_t ptid) +get_thread_regcache (process_stratum_target *target, ptid_t ptid) { - if (!current_thread_arch || current_thread_ptid != ptid) + if (!current_thread_arch + || target != current_thread_target + || current_thread_ptid != ptid) { + gdb_assert (ptid != null_ptid); + current_thread_ptid = ptid; + current_thread_target = target; + + scoped_restore_current_inferior restore_current_inferior; + set_current_inferior (find_inferior_ptid (target, ptid)); current_thread_arch = target_thread_architecture (ptid); } - return get_thread_arch_regcache (ptid, current_thread_arch); + return get_thread_arch_regcache (target, ptid, current_thread_arch); } /* See regcache.h. */ @@ -363,7 +381,8 @@ get_thread_regcache (ptid_t ptid) struct regcache * get_thread_regcache (thread_info *thread) { - return get_thread_regcache (thread->ptid); + return get_thread_regcache (thread->inf->process_target (), + thread->ptid); } struct regcache * @@ -377,7 +396,11 @@ get_current_regcache (void) struct regcache * get_thread_regcache_for_ptid (ptid_t ptid) { - return get_thread_regcache (ptid); + /* This function doesn't take a process_stratum_target parameter + because it's a gdbsupport/ routine implemented by both gdb and + gdbserver. It always refers to a ptid of the current target. */ + process_stratum_target *proc_target = current_inferior ()->process_target (); + return get_thread_regcache (proc_target, ptid); } /* Observer for the target_changed event. */ @@ -412,29 +435,34 @@ regcache::regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) Indicate that registers may have changed, so invalidate the cache. */ void -registers_changed_ptid (ptid_t ptid) +registers_changed_ptid (process_stratum_target *target, ptid_t ptid) { for (auto oit = regcache::current_regcache.before_begin (), it = std::next (oit); it != regcache::current_regcache.end (); ) { - if ((*it)->ptid ().matches (ptid)) + struct regcache *regcache = *it; + if ((target == nullptr || regcache->target () == target) + && regcache->ptid ().matches (ptid)) { - delete *it; + delete regcache; it = regcache::current_regcache.erase_after (oit); } else oit = it++; } - if (current_thread_ptid.matches (ptid)) + if ((target == nullptr || current_thread_target == target) + && current_thread_ptid.matches (ptid)) { + current_thread_target = NULL; current_thread_ptid = null_ptid; current_thread_arch = NULL; } - if (inferior_ptid.matches (ptid)) + if ((target == nullptr || current_inferior ()->process_target () == target) + && inferior_ptid.matches (ptid)) { /* We just deleted the regcache of the current thread. Need to forget about any frames we have cached, too. */ @@ -447,13 +475,13 @@ registers_changed_ptid (ptid_t ptid) void registers_changed_thread (thread_info *thread) { - registers_changed_ptid (thread->ptid); + registers_changed_ptid (thread->inf->process_target (), thread->ptid); } void registers_changed (void) { - registers_changed_ptid (minus_one_ptid); + registers_changed_ptid (nullptr, minus_one_ptid); } void @@ -1400,6 +1428,21 @@ public: } }; +/* Wrapper around get_thread_arch_aspace_regcache that does some self checks. */ + +static void +test_get_thread_arch_aspace_regcache (process_stratum_target *target, + ptid_t ptid, struct gdbarch *gdbarch, + address_space *aspace) +{ + struct regcache *regcache + = get_thread_arch_aspace_regcache (target, ptid, gdbarch, aspace); + SELF_CHECK (regcache != NULL); + SELF_CHECK (regcache->target () == target); + SELF_CHECK (regcache->ptid () == ptid); + SELF_CHECK (regcache->aspace () == aspace); +} + static void current_regcache_test (void) { @@ -1408,47 +1451,61 @@ current_regcache_test (void) ptid_t ptid1 (1), ptid2 (2), ptid3 (3); - /* Get regcache from ptid1, a new regcache is added to - current_regcache. */ - regcache *regcache = get_thread_arch_aspace_regcache (ptid1, - target_gdbarch (), - NULL); + test_target_ops test_target1; + test_target_ops test_target2; - SELF_CHECK (regcache != NULL); - SELF_CHECK (regcache->ptid () == ptid1); + /* Get regcache from (target1,ptid1), a new regcache is added to + current_regcache. */ + test_get_thread_arch_aspace_regcache (&test_target1, ptid1, + target_gdbarch (), + NULL); SELF_CHECK (regcache_access::current_regcache_size () == 1); - /* Get regcache from ptid2, a new regcache is added to + /* Get regcache from (target1,ptid2), a new regcache is added to current_regcache. */ - regcache = get_thread_arch_aspace_regcache (ptid2, - target_gdbarch (), - NULL); - SELF_CHECK (regcache != NULL); - SELF_CHECK (regcache->ptid () == ptid2); + test_get_thread_arch_aspace_regcache (&test_target1, ptid2, + target_gdbarch (), + NULL); SELF_CHECK (regcache_access::current_regcache_size () == 2); - /* Get regcache from ptid3, a new regcache is added to + /* Get regcache from (target1,ptid3), a new regcache is added to current_regcache. */ - regcache = get_thread_arch_aspace_regcache (ptid3, - target_gdbarch (), - NULL); - SELF_CHECK (regcache != NULL); - SELF_CHECK (regcache->ptid () == ptid3); + test_get_thread_arch_aspace_regcache (&test_target1, ptid3, + target_gdbarch (), + NULL); SELF_CHECK (regcache_access::current_regcache_size () == 3); - /* Get regcache from ptid2 again, nothing is added to + /* Get regcache from (target1,ptid2) again, nothing is added to current_regcache. */ - regcache = get_thread_arch_aspace_regcache (ptid2, - target_gdbarch (), - NULL); - SELF_CHECK (regcache != NULL); - SELF_CHECK (regcache->ptid () == ptid2); + test_get_thread_arch_aspace_regcache (&test_target1, ptid2, + target_gdbarch (), + NULL); SELF_CHECK (regcache_access::current_regcache_size () == 3); - /* Mark ptid2 is changed, so regcache of ptid2 should be removed from - current_regcache. */ - registers_changed_ptid (ptid2); - SELF_CHECK (regcache_access::current_regcache_size () == 2); + /* Get regcache from (target2,ptid2), a new regcache is added to + current_regcache, since this time we're using a differen + target. */ + test_get_thread_arch_aspace_regcache (&test_target2, ptid2, + target_gdbarch (), + NULL); + SELF_CHECK (regcache_access::current_regcache_size () == 4); + + /* Mark that (target1,ptid2) changed. The regcache of (target1, + ptid2) should be removed from current_regcache. */ + registers_changed_ptid (&test_target1, ptid2); + SELF_CHECK (regcache_access::current_regcache_size () == 3); + + /* Get the regcache from (target2,ptid2) again, confirming the + registers_changed_ptid call above did not delete it. */ + test_get_thread_arch_aspace_regcache (&test_target2, ptid2, + target_gdbarch (), + NULL); + SELF_CHECK (regcache_access::current_regcache_size () == 3); + + /* Confirm that marking all regcaches of all targets as changed + clears current_regcache. */ + registers_changed_ptid (nullptr, minus_one_ptid); + SELF_CHECK (regcache_access::current_regcache_size () == 0); } class target_ops_no_register : public test_target_ops @@ -1509,8 +1566,9 @@ target_ops_no_register::xfer_partial (enum target_object object, class readwrite_regcache : public regcache { public: - readwrite_regcache (struct gdbarch *gdbarch) - : regcache (gdbarch, nullptr) + readwrite_regcache (process_stratum_target *target, + struct gdbarch *gdbarch) + : regcache (target, gdbarch, nullptr) {} }; @@ -1535,6 +1593,7 @@ cooked_read_test (struct gdbarch *gdbarch) mock_inferior.gdbarch = gdbarch; mock_inferior.aspace = &mock_aspace; thread_info mock_thread (&mock_inferior, mock_ptid); + mock_inferior.thread_map[mock_ptid] = &mock_thread; /* Add the mock inferior to the inferior list so that look ups by target+ptid can find it. */ @@ -1576,7 +1635,7 @@ cooked_read_test (struct gdbarch *gdbarch) break; } - readwrite_regcache readwrite (gdbarch); + readwrite_regcache readwrite (&mock_target, gdbarch); gdb::def_vector buf (register_size (gdbarch, nonzero_regnum)); readwrite.raw_read (nonzero_regnum, buf.data ()); @@ -1709,7 +1768,7 @@ cooked_write_test (struct gdbarch *gdbarch) } } pop_targets; - readwrite_regcache readwrite (gdbarch); + readwrite_regcache readwrite (&mock_target, gdbarch); const int num_regs = gdbarch_num_cooked_regs (gdbarch);