From 7198c7b9f01bbd5e8f8528440d290569e588b260 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Tue, 2 Jun 2020 14:44:08 +0200
Subject: Some cleanup and preparation for support for multiple architectures
 (both host and client) and OSes
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Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 linux/os.h     | 32 ++++++++++++++++++++++
 linux/x86-64.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 linux/os.h
 create mode 100644 linux/x86-64.h

(limited to 'linux')

diff --git a/linux/os.h b/linux/os.h
new file mode 100644
index 0000000..db22f10
--- /dev/null
+++ b/linux/os.h
@@ -0,0 +1,32 @@
+/* See LICENSE file for copyright and license details. */
+#include <linux/elf.h>
+#include <sys/ptrace.h>
+#include <linux/ptrace.h> /* after <sys/ptrace.h> */
+#include <sys/syscall.h>
+#include <sys/user.h>
+
+#ifndef ERESTARTSYS
+# define ERESTARTSYS 512
+# define ALSO_ERESTARTSYS
+#endif
+#ifndef ERESTARTNOINTR
+# define ERESTARTNOINTR 513
+# define ALSO_ERESTARTNOINTR
+#endif
+#ifndef ERESTARTNOHAND
+# define ERESTARTNOHAND 514
+# define ALSO_ERESTARTNOHAND
+#endif
+#ifndef ERESTART_RESTARTBLOCK
+# define ERESTART_RESTARTBLOCK 516
+# define ALSO_ERESTART_RESTARTBLOCK
+#endif
+
+#define RETURN_IS_ERROR(RET)\
+	((RET) > -(unsigned long long int)PAGE_SIZE) /* Don't know the actual limit, but this seems safe */
+
+#if defined(__x86_64__) && !defined(__IPL32__)
+# include "x86-64.h"
+#else
+# error "This program is only implemented for x86-64 on Linux"
+#endif
diff --git a/linux/x86-64.h b/linux/x86-64.h
new file mode 100644
index 0000000..16ff32f
--- /dev/null
+++ b/linux/x86-64.h
@@ -0,0 +1,86 @@
+/* See LICENSE file for copyright and license details. */
+struct i386_user_regs_struct
+{
+	uint32_t ebx;
+	uint32_t ecx;
+	uint32_t edx;
+	uint32_t esi;
+	uint32_t edi;
+	uint32_t ebp;
+	uint32_t eax;
+	uint32_t xds;
+	uint32_t xes;
+	uint32_t xfs;
+	uint32_t xgs;
+	uint32_t orig_eax;
+	uint32_t eip;
+	uint32_t xcs;
+	uint32_t eflags;
+	uint32_t esp;
+	uint32_t xss;
+};
+
+#define SYSCALL_NUM_REG orig_rax
+#define SYSCALL_RET_REG rax
+
+enum {
+      x86_64 = 0,
+      x32,
+      i386
+};
+
+#define CHECK_ARCHITECTURE(proc, regsp)\
+	do {\
+		struct iovec iov = {\
+			.iov_base = (regsp),\
+			.iov_len = sizeof(*(regsp)),\
+		};\
+		if (ptrace(PTRACE_GETREGSET, (proc)->pid, NT_PRSTATUS, &iov)) {\
+			eprintf("ptrace PTRACE_GETREGSET %ju NT_PRSTATUS {.iov_base=<buffer>, .iov_len=%zu}:",\
+			        (uintmax_t)(proc)->pid, sizeof(*(regsp)));\
+		} else if (iov.iov_len != sizeof(*(regsp))) {\
+			if ((proc)->mode != i386) {\
+				(proc)->mode = i386;\
+				(proc)->long_is_int = 1;\
+				(proc)->ptr_is_int = 1;\
+				(proc)->scall_xor = 0;\
+				tprintf(proc, "Process is running in i386 mode, this is not yet supported\n"); /* TODO */\
+				exit(1);\
+			}\
+		} else if ((proc)->scall & __X32_SYSCALL_BIT) {\
+			if ((proc)->mode != x32) {\
+				(proc)->mode = x32;\
+				(proc)->long_is_int = 0;\
+				(proc)->ptr_is_int = 1;\
+				(proc)->scall_xor = __X32_SYSCALL_BIT;\
+				tprintf(proc, "Process is running in x32 mode (support is untested)\n");\
+			}\
+		} else {\
+			if ((proc)->mode != x86_64) {\
+				(proc)->mode = x86_64;\
+				(proc)->long_is_int = 0;\
+				(proc)->ptr_is_int = 0;\
+				(proc)->scall_xor = 0;\
+				tprintf(proc, "Process is running in x86-64 mode\n");\
+			}\
+		}\
+	} while (0)
+
+#define GET_SYSCALL_ARGUMENTS(proc, regsp)\
+	do {\
+		if ((proc)->mode != i386) {\
+			(proc)->args[0] = (regsp)->rdi;\
+			(proc)->args[1] = (regsp)->rsi;\
+			(proc)->args[2] = (regsp)->rdx;\
+			(proc)->args[3] = (regsp)->r10;\
+			(proc)->args[4] = (regsp)->r8;\
+			(proc)->args[5] = (regsp)->r9;\
+		} else {\
+			(proc)->args[0] = ((const struct i386_user_regs_struct *)(regsp))->ebx;\
+			(proc)->args[1] = ((const struct i386_user_regs_struct *)(regsp))->ecx;\
+			(proc)->args[2] = ((const struct i386_user_regs_struct *)(regsp))->edx;\
+			(proc)->args[3] = ((const struct i386_user_regs_struct *)(regsp))->esi;\
+			(proc)->args[4] = ((const struct i386_user_regs_struct *)(regsp))->edi;\
+			(proc)->args[5] = ((const struct i386_user_regs_struct *)(regsp))->ebp;\
+		}\
+	} while (0)
-- 
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