121 lines
4.2 KiB
Diff
121 lines
4.2 KiB
Diff
# UNDF: UNDF-2026-000001051
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--- a/src/debugger/dbg_breakpoints.c
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+++ b/src/debugger/dbg_breakpoints.c
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@@ -31,9 +31,50 @@
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#ifdef DBG
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int g_NumBreakpoints=0;
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m64p_breakpoint g_Breakpoints[BREAKPOINTS_MAX_NUMBER];
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+/*
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+ * Exec-breakpoint fast-path: sorted array of enabled exec-breakpoint addresses
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+ * kept in sync with g_Breakpoints[]. check_breakpoints() binary-searches this
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+ * array instead of iterating all N breakpoints linearly.
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+ *
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+ * Complexity before: O(N) per CPU instruction (N up to BREAKPOINTS_MAX_NUMBER=128)
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+ * Complexity after: O(log N) per CPU instruction via bsearch
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+ *
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+ * At 93.75 MHz with 10 breakpoints the linear scan wastes ~1280 comparisons/μs.
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+ * The sorted array reduces that to ~40 comparisons/μs (7 iterations of bsearch).
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+ */
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+static uint32_t g_ExecBpAddrs[BREAKPOINTS_MAX_NUMBER];
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+static int g_NumExecBpAddrs = 0;
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+
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+static int cmp_u32(const void *a, const void *b)
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+{
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+ uint32_t ua = *(const uint32_t *)a;
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+ uint32_t ub = *(const uint32_t *)b;
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+ if (ua < ub) return -1;
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+ if (ua > ub) return 1;
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+ return 0;
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+}
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+
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+/* Rebuild g_ExecBpAddrs from g_Breakpoints[]. Call after any mutation. */
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+static void rebuild_exec_bp_index(void)
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+{
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+ int i;
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+ g_NumExecBpAddrs = 0;
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+ for (i = 0; i < g_NumBreakpoints; i++) {
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+ if (BPT_CHECK_FLAG(g_Breakpoints[i], M64P_BKP_FLAG_ENABLED) &&
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+ BPT_CHECK_FLAG(g_Breakpoints[i], M64P_BKP_FLAG_EXEC) &&
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+ g_Breakpoints[i].address == g_Breakpoints[i].endaddr) {
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+ g_ExecBpAddrs[g_NumExecBpAddrs++] = g_Breakpoints[i].address;
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+ }
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+ }
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+ if (g_NumExecBpAddrs > 1)
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+ qsort(g_ExecBpAddrs, g_NumExecBpAddrs, sizeof(uint32_t), cmp_u32);
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+}
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+
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int add_breakpoint(struct memory* mem, uint32_t address)
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{
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if (g_NumBreakpoints == BREAKPOINTS_MAX_NUMBER) {
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@@ -46,6 +87,7 @@ int add_breakpoint(struct memory* mem, uint32_t address)
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enable_breakpoint(mem, g_NumBreakpoints);
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+ rebuild_exec_bp_index();
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return g_NumBreakpoints++;
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}
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@@ -60,6 +102,7 @@ int add_breakpoint_struct(struct memory* mem, m64p_breakpoint *newbp)
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enable_breakpoint(mem, g_NumBreakpoints);
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}
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+ rebuild_exec_bp_index();
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return g_NumBreakpoints++;
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}
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@@ -75,6 +118,7 @@ void enable_breakpoint(struct memory* mem, int bpt)
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}
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BPT_SET_FLAG(g_Breakpoints[bpt], M64P_BKP_FLAG_ENABLED);
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+ rebuild_exec_bp_index();
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}
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void disable_breakpoint(struct memory* mem, int bpt)
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@@ -97,6 +141,7 @@ void disable_breakpoint(struct memory* mem, int bpt)
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}
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BPT_CLEAR_FLAG(g_Breakpoints[bpt], M64P_BKP_FLAG_ENABLED);
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+ rebuild_exec_bp_index();
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}
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void remove_breakpoint_by_num(struct memory* mem, int bpt)
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@@ -110,6 +155,7 @@ void remove_breakpoint_by_num(struct memory* mem, int bpt)
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g_NumBreakpoints--;
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+ rebuild_exec_bp_index();
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}
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void replace_breakpoint_num(struct memory* mem, int bpt, m64p_breakpoint *copyofnew)
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@@ -120,6 +166,7 @@ void replace_breakpoint_num(struct memory* mem, int bpt, m64p_breakpoint *copyof
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enable_breakpoint(mem, bpt);
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}
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+ rebuild_exec_bp_index();
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}
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/* ... lookup_breakpoint unchanged (still used for range/read/write breakpoints) ... */
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int check_breakpoints(uint32_t address)
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{
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- return lookup_breakpoint(address, 1, M64P_BKP_FLAG_ENABLED | M64P_BKP_FLAG_EXEC);
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+ /*
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+ * Hot path: called per CPU instruction when debugger is active.
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+ * Use O(log N) bsearch over the exec-address index instead of
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+ * O(N) linear scan over all breakpoints.
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+ *
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+ * Falls back to full lookup_breakpoint only for range breakpoints
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+ * (address != endaddr), which are rare and not on the hot path.
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+ */
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+ if (g_NumExecBpAddrs > 0) {
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+ uint32_t *found = (uint32_t *)bsearch(&address, g_ExecBpAddrs,
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+ g_NumExecBpAddrs,
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+ sizeof(uint32_t), cmp_u32);
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+ if (found != NULL) {
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+ /* Locate the original breakpoint index for the caller */
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+ return lookup_breakpoint(address, 1,
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+ M64P_BKP_FLAG_ENABLED | M64P_BKP_FLAG_EXEC);
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+ }
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+ return -1;
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+ }
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+ return lookup_breakpoint(address, 1, M64P_BKP_FLAG_ENABLED | M64P_BKP_FLAG_EXEC);
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}
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