these functions are actually pointless, since it's easier to change the *offset* for actual pc-rel loads (and the rest are accounted for, albeit implicitly in the case of add pc)

i might end up using the stack :/

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/transform-dis.inc.h b/lib/transform-dis.inc.h
new file mode 100644
index 0000000..6889127
--- /dev/null
+++ b/lib/transform-dis.inc.h
@@ -0,0 +1,55 @@
+typedef struct {
+    bool modify;
+} tdis_ret;
+typedef struct tc {
+    uintptr_t pc;
+    int op_size;
+    uint32_t op;
+    uint32_t newop;
+    uint32_t newval[4];
+    uintptr_t pc_patch_start;
+    uintptr_t pc_patch_end;
+    bool got_bad;
+
+} *tdis_ctx;
+
+NOINLINE UNUSED
+static tdis_ret P_data(struct tc *ctx, unsigned o0, unsigned o1, unsigned o2, unsigned o3, unsigned out_mask) {
+    __builtin_abort();
+}
+
+NOINLINE UNUSED
+static tdis_ret P_pcrel(struct tc *ctx, uintptr_t dpc, unsigned reg, bool is_load) {
+    __builtin_abort();
+}
+
+NOINLINE UNUSED
+static tdis_ret P_ret(struct tc *ctx) {
+    /* ret is okay if it's at the end of the patch */
+    if (ctx->pc + op_size < ctx->pc_patch_end) 
+        ctx->got_bad = true;
+    printf("ret: %08x\n", ctx->op);
+    return (tdis_ret) {false};
+}
+
+NOINLINE UNUSED
+static tdis_ret P_branch(struct tc *ctx, uintptr_t dpc) {
+    if (dpc >= ctx->pc_patch_start && dpc < ctx->pc_patch_end) {
+        /* don't support this for now */
+        ctx->got_bad = true;
+    }
+    return (tdis_ret) {false};
+}
+
+NOINLINE UNUSED
+static tdis_ret P_unidentified(struct tc *ctx) {
+    return (tdis_ret) {false};
+}
+
+NOINLINE UNUSED
+static tdis_ret P_bad(struct tc *ctx) {
+    ctx->got_bad = true;
+    return (tdis_ret) {false};
+}
+
+#define P(x) transform_dis_##x