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shim-unsigned-x64/SOURCES/0030-shim-Rework-pause-functions-and-add-read_counter.patch
CentOS Sources 00a828377a import shim-unsigned-x64-15-7.el8
2021-09-10 04:30:16 +00:00

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From 1b382ef850de5a6c59b192c146a0e8d898d2d961 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 23 Oct 2018 18:17:57 -0400
Subject: [PATCH 30/62] shim: Rework pause functions and add read_counter()
Signed-off-by: Peter Jones <pjones@redhat.com>
Upstream-commit-id: fc6b0bca84e
---
shim.c | 4 +-
include/asm.h | 59 +++++++++++++++++
include/compiler.h | 156 +++++++++++++++++++++++++++++++++++++++++++++
shim.h | 1 +
4 files changed, 217 insertions(+), 3 deletions(-)
create mode 100644 include/asm.h
create mode 100644 include/compiler.h
diff --git a/shim.c b/shim.c
index d4ed332f901..f69e69487fc 100644
--- a/shim.c
+++ b/shim.c
@@ -2543,16 +2543,14 @@ debug_hook(void)
#if defined(__x86_64__) || defined(__i386__) || defined(__i686__)
if (x > 4294967294ULL)
break;
- __asm__ __volatile__("pause");
#elif defined(__aarch64__)
if (x > 1000)
break;
- __asm__ __volatile__("wfi");
#else
if (x > 12000)
break;
- msleep(5000);
#endif
+ pause();
}
x = 1;
}
diff --git a/include/asm.h b/include/asm.h
new file mode 100644
index 00000000000..5e8f9ed9d7c
--- /dev/null
+++ b/include/asm.h
@@ -0,0 +1,59 @@
+/*
+ * asm.h
+ * Copyright 2018 Peter Jones <pjones@redhat.com>
+ */
+
+#ifndef SHIM_ASM_H_
+#define SHIM_ASM_H_
+
+#define __stringify_1(x...) #x
+#define __stringify(x...) __stringify_1(x)
+
+static inline uint64_t read_counter(void)
+{
+ uint64_t val;
+#if defined (__x86_64__)
+ unsigned long low, high;
+ __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high));
+ val = (low) | (high) << 32;
+#elif defined(__i386__) || defined(__i686__)
+ __asm__ __volatile__("rdtsc" : "=A" (val));
+#elif defined(__aarch64__)
+ __asm__ __volatile__ ("mrs %0, pmccntr_el0" : "=r" (val));
+#elif defined(__arm__)
+ __asm__ __volatile__ ("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));
+#else
+#error unsupported arch
+#endif
+ return val;
+}
+
+#if defined(__x86_64__) || defined(__i386__) || defined(__i686__)
+static inline void pause(void)
+{
+ __asm__ __volatile__("pause");
+}
+#elif defined(__aarch64__)
+static inline void pause(void)
+{
+ __asm__ __volatile__("wfi");
+}
+#else
+static inline void pause(void)
+{
+ uint64_t a, b;
+ int x;
+ extern void msleep(unsigned long msecs);
+
+ a = read_counter();
+ for (x = 0; x < 1000; x++) {
+ msleep(1000);
+ b = read_counter();
+ if (a != b)
+ break;
+ }
+}
+#endif
+
+#endif /* !SHIM_ASM_H_ */
+// vim:fenc=utf-8:tw=75:et
diff --git a/include/compiler.h b/include/compiler.h
new file mode 100644
index 00000000000..a2a0859379f
--- /dev/null
+++ b/include/compiler.h
@@ -0,0 +1,156 @@
+/*
+ * compiler.h
+ * Copyright 2019 Peter Jones <pjones@redhat.com>
+ */
+
+#ifndef COMPILER_H_
+#define COMPILER_H_
+
+#ifndef UNUSED
+#define UNUSED __attribute__((__unused__))
+#endif
+#ifndef HIDDEN
+#define HIDDEN __attribute__((__visibility__ ("hidden")))
+#endif
+#ifndef PUBLIC
+#define PUBLIC __attribute__((__visibility__ ("default")))
+#endif
+#ifndef DESTRUCTOR
+#define DESTRUCTOR __attribute__((destructor))
+#endif
+#ifndef CONSTRUCTOR
+#define CONSTRUCTOR __attribute__((constructor))
+#endif
+#ifndef ALIAS
+#define ALIAS(x) __attribute__((weak, alias (#x)))
+#endif
+#ifndef NONNULL
+#endif
+#define NONNULL(first, args...) __attribute__((__nonnull__(first, ## args)))
+#ifndef PRINTF
+#define PRINTF(first, args...) __attribute__((__format__(printf, first, ## args)))
+#endif
+#ifndef FLATTEN
+#define FLATTEN __attribute__((__flatten__))
+#endif
+#ifndef PACKED
+#define PACKED __attribute__((__packed__))
+#endif
+#ifndef VERSION
+#define VERSION(sym, ver) __asm__(".symver " # sym "," # ver)
+#endif
+#ifndef NORETURN
+#define NORETURN __attribute__((__noreturn__))
+#endif
+#ifndef ALIGNED
+#define ALIGNED(n) __attribute__((__aligned__(n)))
+#endif
+#ifndef CLEANUP_FUNC
+#define CLEANUP_FUNC(x) __attribute__((__cleanup__(x)))
+#endif
+#ifndef USED
+#define USED __attribute__((__used__))
+#endif
+#ifndef SECTION
+#define SECTION(x) __attribute__((__section__(x)))
+#endif
+#ifndef OPTIMIZE
+#define OPTIMIZE(x) __attribute__((__optimize__(x)))
+#endif
+
+#ifndef __CONCAT
+#define __CONCAT3(a, b, c) a ## b ## c
+#endif
+#ifndef CAT
+#define CAT(a, b) __CONCAT(a, b)
+#endif
+#ifndef CAT3
+#define CAT3(a, b, c) __CONCAT3(a, b, c)
+#endif
+#ifndef STRING
+#define STRING(x) __STRING(x)
+#endif
+
+#ifndef WRITE_ONCE
+#define WRITE_ONCE(var, val) \
+ (*((volatile typeof(val) *)(&(var))) = (val))
+#endif
+
+#ifndef READ_ONCE
+#define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))
+#endif
+
+#ifndef likely
+#define likely(x) __builtin_expect(!!(x), 1)
+#endif
+
+#ifndef unlikely
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#endif
+
+/* Are two types/vars the same type (ignoring qualifiers)? */
+#ifndef __same_type
+#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#endif
+
+/* Compile time object size, -1 for unknown */
+#ifndef __compiletime_object_size
+# define __compiletime_object_size(obj) -1
+#endif
+#ifndef __compiletime_warning
+# define __compiletime_warning(message)
+#endif
+#ifndef __compiletime_error
+# define __compiletime_error(message)
+#endif
+
+#ifndef __compiletime_assert
+#define __compiletime_assert(condition, msg, prefix, suffix) \
+ do { \
+ extern void prefix ## suffix(void) __compiletime_error(msg); \
+ if (!(condition)) \
+ prefix ## suffix(); \
+ } while (0)
+#endif
+
+#ifndef _compiletime_assert
+#define _compiletime_assert(condition, msg, prefix, suffix) \
+ __compiletime_assert(condition, msg, prefix, suffix)
+#endif
+
+/**
+ * compiletime_assert - break build and emit msg if condition is false
+ * @condition: a compile-time constant condition to check
+ * @msg: a message to emit if condition is false
+ *
+ * In tradition of POSIX assert, this macro will break the build if the
+ * supplied condition is *false*, emitting the supplied error message if the
+ * compiler has support to do so.
+ */
+#ifndef compiletime_assert
+#define compiletime_assert(condition, msg) \
+ _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
+#endif
+
+/**
+ * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
+ * error message.
+ * @condition: the condition which the compiler should know is false.
+ *
+ * See BUILD_BUG_ON for description.
+ */
+#ifndef BUILD_BUG_ON_MSG
+#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
+#endif
+
+#ifndef ALIGN
+#define __ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
+#define __ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a) - 1)
+#define ALIGN(x, a) __ALIGN((x), (a))
+#endif
+#ifndef ALIGN_DOWN
+#define ALIGN_DOWN(x, a) __ALIGN((x) - ((a) - 1), (a))
+#endif
+
+#endif /* !COMPILER_H_ */
+// vim:fenc=utf-8:tw=75:et
diff --git a/shim.h b/shim.h
index e4d40505f09..a0fa5a75e7e 100644
--- a/shim.h
+++ b/shim.h
@@ -97,6 +97,7 @@
#define FALLBACK L"\\fb" EFI_ARCH L".efi"
#define MOK_MANAGER L"\\mm" EFI_ARCH L".efi"
+#include "include/asm.h"
#include "include/configtable.h"
#include "include/console.h"
#include "include/crypt_blowfish.h"
--
2.26.2
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