Decoupling Architectural-specific Code (#35)

[lunaix-os.git] / lunaix-os / kernel / debug / trace.c

diff --git a/lunaix-os/kernel/debug/trace.c b/lunaix-os/kernel/debug/trace.c
index c08a6f726e7a8c267308b04d5efdeaacb4341819..66e5505e2bc97a92d6c022beecbbe57391be9112 100644 (file)
--- a/lunaix-os/kernel/debug/trace.c
+++ b/lunaix-os/kernel/debug/trace.c
@@ -1,37 +1,210 @@
-#include <lunaix/mm/mmio.h>

 #include <lunaix/mm/page.h>
 #include <lunaix/mm/page.h>

+#include <lunaix/process.h>

 #include <lunaix/spike.h>
 #include <lunaix/spike.h>

+#include <lunaix/syslog.h>

 #include <lunaix/trace.h>
 
 #include <lunaix/trace.h>
 

+#include <sys/abi.h>
+#include <sys/mm/mm_defs.h>
+#include <sys/trace.h>
+

 #include <klibc/string.h>
 
 #include <klibc/string.h>
 

+#define NB_TRACEBACK 16
+
+LOG_MODULE("TRACE")
+
+weak struct ksyms __lunaix_ksymtable[] = { };
+extern struct ksyms __lunaix_ksymtable[];
+

 static struct trace_context trace_ctx;
 
 static struct trace_context trace_ctx;
 

+void
+trace_log(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+
+    kprintf_m("TRACE", fmt, args);
+
+    va_end(args);
+}
+

 void
 trace_modksyms_init(struct boot_handoff* bhctx)
 {
 void
 trace_modksyms_init(struct boot_handoff* bhctx)
 {

-    struct boot_modent* modents = bhctx->mods.entries;
-    for (size_t i = 0; i < bhctx->mods.mods_num; i++) {
-        struct boot_modent* mod = &bhctx->mods.entries[i];
-        if (streq(mod->str, "modksyms")) {
-            // In case boot loader does not place our ksyms on page boundary
-            ptr_t start = PG_ALIGN(mod->start);
-            ptr_t end = ROUNDUP(mod->end, PG_SIZE);
-            ptr_t ksym_va = (ptr_t)ioremap(start, (end - start));
-
-            trace_ctx.ksym_table =
-              (struct ksyms*)(ksym_va + (mod->start - start));
+    trace_ctx.ksym_table = __lunaix_ksymtable;
+}
+
+struct ksym_entry*
+trace_sym_lookup(ptr_t addr)
+{
+    unsigned long c = trace_ctx.ksym_table->ksym_count;
+    struct ksym_entry* ksent = trace_ctx.ksym_table->syms;
+
+    int i = c - 1, j = 0, m = 0;
+
+    if (addr > ksent[i].pc || addr < ksent[j].pc || !kernel_addr(addr)) {
+        return NULL;
+    }
+
+    while (i - j != 1) {
+        m = (i + j) / 2;
+        if (ksent[m].pc > addr) {
+            i = m;
+        } else if (ksent[m].pc < addr) {
+            j = m;
+        } else {
+            break;

         }
     }
         }
     }

+
+    struct ksym_entry* result = &ksent[MIN(i, j)];
+    if (result->pc > addr) {
+        return NULL;
+    }
+
+    return result;

 }
 
 }
 

-struct ksym_entry*
-trace_sym_lookup(ptr_t pc)
+static char*
+ksym_getstr(struct ksym_entry* sym)

 {
 {

-    return NULL;
+    if (!sym) {
+        return "???";
+    }
+
+    return sym->label;
+}
+
+static inline bool valid_fp(ptr_t ptr) {
+    ptr_t start = ROUNDUP(current_thread->kstack - KSTACK_SIZE, MEM_PAGE);
+
+    return (start < ptr && ptr < current_thread->kstack) 
+           || arch_valid_fp(ptr);
+}
+
+int
+trace_walkback(struct trace_record* tb_buffer,
+               ptr_t fp,
+               int limit,
+               ptr_t* last_fp)
+{
+    ptr_t* frame = (ptr_t*)fp;
+    struct ksym_entry* current = NULL;
+    int i = 0;
+
+    while (valid_fp((ptr_t)frame) && i < limit) {
+        ptr_t pc = abi_get_retaddrat((ptr_t)frame);
+
+        current = trace_sym_lookup(pc);
+        tb_buffer[i] =
+          (struct trace_record){ .pc = pc,
+                                 .sym_pc = current ? current->pc : 0,
+                                 .symbol = ksym_getstr(current) };
+
+        frame = (ptr_t*)*frame;
+        i++;
+    }
+
+    if (!valid_fp((ptr_t)frame)) {
+        frame = NULL;
+    }
+
+    if (last_fp) {
+        *last_fp = (ptr_t)frame;
+    }
+
+    return i;
+}
+
+static inline void
+trace_print_code_entry(ptr_t sym_pc, ptr_t inst_pc, char* sym)
+{
+    if (sym_pc) {
+        trace_log("%s+%p", sym, inst_pc - sym_pc);
+    } else {
+        trace_log("%s [%p]", sym, sym_pc);
+    }

 }
 
 void
 }
 
 void

-trace_walkback(ptr_t fp)
+trace_printstack_of(ptr_t fp)
+{
+    struct trace_record tbs[NB_TRACEBACK];
+
+    // Let's get our Stackwalker does his job ;)
+    int n = trace_walkback(tbs, fp, NB_TRACEBACK, &fp);
+
+    if (fp) {
+        trace_log("...<truncated>");
+    }
+
+    for (int i = 0; i < n; i++) {
+        struct trace_record* tb = &tbs[i];
+        trace_print_code_entry(tb->sym_pc, tb->pc, tb->symbol);
+    }
+}
+
+void
+trace_printstack()
+{
+    if (current_thread) {
+        trace_printstack_isr(current_thread->hstate);
+    }
+    else {
+        trace_printstack_of(abi_get_callframe());
+    }
+}
+
+static void
+trace_printswctx(const struct hart_state* hstate, bool from_usr, bool to_usr)

 {
 {

+
+    struct ksym_entry* sym = trace_sym_lookup(hstate->execp->eip);
+
+    trace_log("^^^^^ --- %s", to_usr ? "user" : "kernel");
+    trace_print_transistion_short(hstate);
+    trace_log("vvvvv --- %s", from_usr ? "user" : "kernel");
+
+    ptr_t sym_pc = sym ? sym->pc : hart_pc(hstate);
+    trace_print_code_entry(sym_pc, hart_pc(hstate), ksym_getstr(sym));
+}
+
+void
+trace_printstack_isr(const struct hart_state* hstate)
+{
+    struct hart_state* p = hstate;
+    ptr_t fp = abi_get_callframe();
+    int prev_usrctx = 0;
+
+    trace_log("stack trace (pid=%d)\n", __current->pid);
+
+    trace_printstack_of(fp);
+
+    while (p) {
+        if (!prev_usrctx) {
+            if (!kernel_context(p)) {
+                trace_printswctx(p, true, false);
+            } else {
+                trace_printswctx(p, false, false);
+            }
+        } else {
+            trace_printswctx(p, false, true);
+        }
+
+        fp = hart_stack_frame(p);
+        if (!valid_fp(fp)) {
+            trace_log("??? invalid frame: %p", fp);
+            break;
+        }
+
+        trace_printstack_of(fp);
+
+        prev_usrctx = !kernel_context(p);
+
+        p = hart_parent_state(p);
+    }
+
+    trace_log("----- [trace end] -----\n");

 }
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 }
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