Merge tag 'pull-testing-gdbstub-plugins-gitdm-061022-3' of https://github.com/stsquad/qemu into staging

testing, gdbstub, plugin and gitdm updates

  - cleanup scripts/ci/setup in advance of ppc64 runner
  - ensure detected gdb reported to TCG tests
  - update hexagon container with build deps
  - move alpine container to tagged release
  - fix overflow during qos-test test tree iteration
  - allow bios blobs to be built with test cross compilers
  - introduce monitor_puts for plain strings
  - share disas code between monitor and plugins
  - fix bug in execlog plugin
  - add more tcg plugin documentation, reorg
  - fix link to semihosting spec
  - re-factor gdbstub to use AccelClass/Ops
  - many gitdm updates
  - fix race with plugin mutex lock and linux-user fork()

# -----BEGIN PGP SIGNATURE-----
#
# iQEzBAABCgAdFiEEZoWumedRZ7yvyN81+9DbCVqeKkQFAmM+s+YACgkQ+9DbCVqe
# KkSDwgf/Qj0OScOr5Bfw3/KAV0/SFL1vHISb2r5qZVG4DvdY/c/sitPBHPJ8N5jQ
# 918M8AiI3+4Mb/GwkdYBEyWgVZ5ELOkJTObypa5pwmF1K/xDUlG7ZRmJ9+xkJ44Q
# TmrVLQyw6d907B2u+DfqX68AYYnto1yQT/eUo6TiLdIJ5NXIYRn5u34snG9qWHja
# b/Dp7DxnoJMS1EhlMhukekCHGGNUeYn4ewIKbsG1EouH5PndzrvP8LRAcWyxv0m4
# tD2bEAHCMKqTqefkNgG7GCO3HND1JBfWdckx3OD4hBnMnuNtsZBL23QN7MDytgnv
# 0JnYSwkWZCuMIt7oKCOXLUbCjQG97Q==
# =1vZ4
# -----END PGP SIGNATURE-----
# gpg: Signature made Thu 06 Oct 2022 06:54:30 EDT
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* tag 'pull-testing-gdbstub-plugins-gitdm-061022-3' of https://github.com/stsquad/qemu: (52 commits)
  plugins: add [pre|post]fork helpers to linux-user
  contrib/gitdm: add Université Grenoble Alpes
  contrib/gitdm: add Simon to individual contributors
  contrib/gitdm: add China Telecom to the domain map
  contrib/gitdm: add ISCAS to the academics group
  contrib/gitdm: add WANG Xuerui to individual contributers
  contrib/gitdm: add Paul to individual contributors
  contrib/gitdm: add mapping for Loongson Technology
  accel/kvm: move kvm_update_guest_debug to inline stub
  gdbstub: move guest debug support check to ops
  gdbstub: move breakpoint logic to accel ops
  gdbstub: move sstep flags probing into AccelClass
  gdbstub: move into its own sub directory
  semihosting: update link to spec
  docs/devel: document the test plugins
  contrib/plugins: reset skip when matching in execlog
  docs/devel: move API to end of tcg-plugins.rst
  docs/devel: clean-up qemu invocations in tcg-plugins
  plugins: Assert mmu_idx in range before use in qemu_plugin_get_hwaddr
  plugins: extend execlog to filter matches
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 85 insertions, 14 deletions

diff --git a/contrib/plugins/execlog.c b/contrib/plugins/execlog.c
index a5275dcc15..1b3bb7ebba 100644
--- a/contrib/plugins/execlog.c
+++ b/contrib/plugins/execlog.c
@@ -20,6 +20,9 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
 /* Store last executed instruction on each vCPU as a GString */
 GArray *last_exec;
 
+static GPtrArray *imatches;
+static GArray *amatches;
+
 /**
  * Add memory read or write information to current instruction log
  */
@@ -85,12 +88,13 @@ static void vcpu_insn_exec(unsigned int cpu_index, void *udata)
 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
 {
     struct qemu_plugin_insn *insn;
-    uint64_t insn_vaddr;
-    uint32_t insn_opcode;
-    char *insn_disas;
+    bool skip = (imatches || amatches);
 
     size_t n = qemu_plugin_tb_n_insns(tb);
     for (size_t i = 0; i < n; i++) {
+        char *insn_disas;
+        uint64_t insn_vaddr;
+
         /*
          * `insn` is shared between translations in QEMU, copy needed data here.
          * `output` is never freed as it might be used multiple times during
@@ -99,20 +103,55 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
          * a limitation for CISC architectures.
          */
         insn = qemu_plugin_tb_get_insn(tb, i);
-        insn_vaddr = qemu_plugin_insn_vaddr(insn);
-        insn_opcode = *((uint32_t *)qemu_plugin_insn_data(insn));
         insn_disas = qemu_plugin_insn_disas(insn);
-        char *output = g_strdup_printf("0x%"PRIx64", 0x%"PRIx32", \"%s\"",
-                                       insn_vaddr, insn_opcode, insn_disas);
+        insn_vaddr = qemu_plugin_insn_vaddr(insn);
+
+        /*
+         * If we are filtering we better check out if we have any
+         * hits. The skip "latches" so we can track memory accesses
+         * after the instruction we care about.
+         */
+        if (skip && imatches) {
+            int j;
+            for (j = 0; j < imatches->len && skip; j++) {
+                char *m = g_ptr_array_index(imatches, j);
+                if (g_str_has_prefix(insn_disas, m)) {
+                    skip = false;
+                }
+            }
+        }
+
+        if (skip && amatches) {
+            int j;
+            for (j = 0; j < amatches->len && skip; j++) {
+                uint64_t v = g_array_index(amatches, uint64_t, j);
+                if (v == insn_vaddr) {
+                    skip = false;
+                }
+            }
+        }
 
-        /* Register callback on memory read or write */
-        qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
-                                         QEMU_PLUGIN_CB_NO_REGS,
-                                         QEMU_PLUGIN_MEM_RW, NULL);
+        if (skip) {
+            g_free(insn_disas);
+        } else {
+            uint32_t insn_opcode;
+            insn_opcode = *((uint32_t *)qemu_plugin_insn_data(insn));
+            char *output = g_strdup_printf("0x%"PRIx64", 0x%"PRIx32", \"%s\"",
+                                           insn_vaddr, insn_opcode, insn_disas);
+
+            /* Register callback on memory read or write */
+            qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
+                                             QEMU_PLUGIN_CB_NO_REGS,
+                                             QEMU_PLUGIN_MEM_RW, NULL);
+
+            /* Register callback on instruction */
+            qemu_plugin_register_vcpu_insn_exec_cb(insn, vcpu_insn_exec,
+                                                   QEMU_PLUGIN_CB_NO_REGS, output);
+
+            /* reset skip */
+            skip = (imatches || amatches);
+        }
 
-        /* Register callback on instruction */
-        qemu_plugin_register_vcpu_insn_exec_cb(insn, vcpu_insn_exec,
-                                               QEMU_PLUGIN_CB_NO_REGS, output);
     }
 }
 
@@ -132,6 +171,25 @@ static void plugin_exit(qemu_plugin_id_t id, void *p)
     }
 }
 
+/* Add a match to the array of matches */
+static void parse_insn_match(char *match)
+{
+    if (!imatches) {
+        imatches = g_ptr_array_new();
+    }
+    g_ptr_array_add(imatches, match);
+}
+
+static void parse_vaddr_match(char *match)
+{
+    uint64_t v = g_ascii_strtoull(match, NULL, 16);
+
+    if (!amatches) {
+        amatches = g_array_new(false, true, sizeof(uint64_t));
+    }
+    g_array_append_val(amatches, v);
+}
+
 /**
  * Install the plugin
  */
@@ -145,6 +203,19 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
      */
     last_exec = g_array_new(FALSE, FALSE, sizeof(GString *));
 
+    for (int i = 0; i < argc; i++) {
+        char *opt = argv[i];
+        g_autofree char **tokens = g_strsplit(opt, "=", 2);
+        if (g_strcmp0(tokens[0], "ifilter") == 0) {
+            parse_insn_match(tokens[1]);
+        } else if (g_strcmp0(tokens[0], "afilter") == 0) {
+            parse_vaddr_match(tokens[1]);
+        } else {
+            fprintf(stderr, "option parsing failed: %s\n", opt);
+            return -1;
+        }
+    }
+
     /* Register translation block and exit callbacks */
     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
     qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);