From 6f0a28b09a670371b22658a295403ab2573ed993 Mon Sep 17 00:00:00 2001
From: Jakob <jakob@memeware.net>
Date: Sun, 3 Sep 2017 14:35:48 -0400
Subject: Fixed up how the user regs struct is accessed.

---
 wrapper/ptrace.c | 83 +++++++++++++++-----------------------------------------
 1 file changed, 22 insertions(+), 61 deletions(-)

(limited to 'wrapper')

diff --git a/wrapper/ptrace.c b/wrapper/ptrace.c
index 7e5dfa8..8517519 100644
--- a/wrapper/ptrace.c
+++ b/wrapper/ptrace.c
@@ -19,9 +19,12 @@
 
 #include <sys/ptrace.h>
 #include <sys/types.h>
+#include <sys/user.h>
+#include <sys/utsname.h>
 #include <sys/wait.h>
 
 #include <stddef.h>
+#include <string.h>
 #include <unistd.h>
 
 
@@ -86,73 +89,31 @@ int cont(int pid) {
 }
 
 
-/* user_regs_struct is copied from sys/user.h so that we can debug a
-   32-bit executable on a 64-bit platform. */
-struct amd64_user_regs_struct {
-    __extension__ unsigned long long r15;
-    __extension__ unsigned long long r14;
-    __extension__ unsigned long long r13;
-    __extension__ unsigned long long r12;
-    __extension__ unsigned long long rbp;
-    __extension__ unsigned long long rbx;
-    __extension__ unsigned long long r11;
-    __extension__ unsigned long long r10;
-    __extension__ unsigned long long r9;
-    __extension__ unsigned long long r8;
-    __extension__ unsigned long long rax;
-    __extension__ unsigned long long rcx;
-    __extension__ unsigned long long rdx;
-    __extension__ unsigned long long rsi;
-    __extension__ unsigned long long rdi;
-    __extension__ unsigned long long orig_rax;
-    __extension__ unsigned long long rip;
-    __extension__ unsigned long long cs;
-    __extension__ unsigned long long eflags;
-    __extension__ unsigned long long rsp;
-    __extension__ unsigned long long ss;
-    __extension__ unsigned long long fs_base;
-    __extension__ unsigned long long gs_base;
-    __extension__ unsigned long long ds;
-    __extension__ unsigned long long es;
-    __extension__ unsigned long long fs;
-    __extension__ unsigned long long gs;
-};
-
-
-struct i386_user_regs_struct {
-    unsigned long ebx;
-    unsigned long ecx;
-    unsigned long edx;
-    unsigned long esi;
-    unsigned long edi;
-    unsigned long ebp;
-    unsigned long eax;
-    unsigned long xds;
-    unsigned long xes;
-    unsigned long xfs;
-    unsigned long xgs;
-    unsigned long orig_eax;
-    unsigned long eip;
-    unsigned long xcs;
-    unsigned long eflags;
-    unsigned long esp;
-    unsigned long xss;
-};
-
-
-unsigned long long getreg64(int pid, int idx) {
-    struct amd64_user_regs_struct regs;
+/* TODO: As of now, Hypodermis is strongly tied to the Intel x86
+   family of processors. This should really be expanded. */
+int is_amd64(void) {
+    struct utsname ub;
 
-    ptrace(PTRACE_GETREGS, pid, NULL, &regs);
+    uname(&ub);
 
-    return ((unsigned long long *) &regs)[idx];
+    return !strcmp(ub.machine, "x86_64");
 }
 
 
-unsigned long getreg32(int pid, int idx) {
-    struct i386_user_regs_struct regs;
+#ifdef __x86_64__
+unsigned long long getreg(int pid, int idx) {
+    struct user_regs_struct regs;
+
+    ptrace(PTRACE_GETREGS, pid, NULL, &regs);
+
+    return ((unsigned long long *) &regs)[idx];
+}
+#else
+unsigned long getreg(int pid, int idx) {
+    struct user_regs_struct regs;
 
     ptrace(PTRACE_GETREGS, pid, NULL, &regs);
 
-    return ((unsigned long  *) &regs)[idx];
+    return ((unsigned long *) &regs)[idx];
 }
+#endif
-- 
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