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Subject[PATCH 03/13] x86/paravirt: Convert native patch assembly code strings to macros
Date
Convert the hard-coded native patch assembly code strings to macros to
facilitate sharing common code between 32-bit and 64-bit.

These macros will also be used by a future patch which requires the GCC
extended asm syntax of two '%' characters instead of one when specifying
a register name.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
arch/x86/include/asm/special_insns.h | 24 ++++++++++++++++++++++++
arch/x86/kernel/paravirt_patch_32.c | 21 +++++++++++----------
arch/x86/kernel/paravirt_patch_64.c | 29 +++++++++++++++--------------
3 files changed, 50 insertions(+), 24 deletions(-)

diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index ac402c6fc24b..0549c5f2c1b3 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -6,6 +6,30 @@

#include <asm/nops.h>

+#ifdef CONFIG_X86_64
+# define _REG_ARG1 "%rdi"
+# define NATIVE_IDENTITY_32 "mov %edi, %eax"
+# define NATIVE_USERGS_SYSRET64 "swapgs; sysretq"
+#else
+# define _REG_ARG1 "%eax"
+#endif
+
+#define _REG_RET "%" _ASM_AX
+
+#define NATIVE_ZERO "xor " _REG_ARG1 ", " _REG_ARG1
+#define NATIVE_IDENTITY "mov " _REG_ARG1 ", " _REG_RET
+#define NATIVE_SAVE_FL "pushf; pop " _REG_RET
+#define NATIVE_RESTORE_FL "push " _REG_ARG1 "; popf"
+#define NATIVE_IRQ_DISABLE "cli"
+#define NATIVE_IRQ_ENABLE "sti"
+#define NATIVE_READ_CR2 "mov %cr2, " _REG_RET
+#define NATIVE_READ_CR3 "mov %cr3, " _REG_RET
+#define NATIVE_WRITE_CR3 "mov " _REG_ARG1 ", %cr3"
+#define NATIVE_FLUSH_TLB_SINGLE "invlpg (" _REG_ARG1 ")"
+#define NATIVE_SWAPGS "swapgs"
+#define NATIVE_IRET "iret"
+#define NATIVE_QUEUED_SPIN_UNLOCK "movb $0, (" _REG_ARG1 ")"
+
/*
* Volatile isn't enough to prevent the compiler from reordering the
* read/write functions for the control registers and messing everything up.
diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
index 553acbbb4d32..c9c6106ae714 100644
--- a/arch/x86/kernel/paravirt_patch_32.c
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -1,17 +1,18 @@
#include <asm/paravirt.h>
+#include <asm/special_insns.h>

-DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
-DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
-DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
-DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
-DEF_NATIVE(pv_cpu_ops, iret, "iret");
-DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
-DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
-DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
+DEF_NATIVE(pv_irq_ops, save_fl, NATIVE_SAVE_FL);
+DEF_NATIVE(pv_irq_ops, restore_fl, NATIVE_RESTORE_FL);
+DEF_NATIVE(pv_irq_ops, irq_disable, NATIVE_IRQ_DISABLE);
+DEF_NATIVE(pv_irq_ops, irq_enable, NATIVE_IRQ_ENABLE);
+DEF_NATIVE(pv_cpu_ops, iret, NATIVE_IRET);
+DEF_NATIVE(pv_mmu_ops, read_cr2, NATIVE_READ_CR2);
+DEF_NATIVE(pv_mmu_ops, read_cr3, NATIVE_READ_CR3);
+DEF_NATIVE(pv_mmu_ops, write_cr3, NATIVE_WRITE_CR3);

#if defined(CONFIG_PARAVIRT_SPINLOCKS)
-DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
-DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, "xor %eax, %eax");
+DEF_NATIVE(pv_lock_ops, queued_spin_unlock, NATIVE_QUEUED_SPIN_UNLOCK);
+DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, NATIVE_ZERO);
#endif

unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index 0a1ba3f80cbf..0aa232edd670 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -1,25 +1,26 @@
#include <asm/paravirt.h>
#include <asm/asm-offsets.h>
+#include <asm/special_insns.h>
#include <linux/stringify.h>

-DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
-DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
-DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
-DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
-DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
-DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
-DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
-DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
+DEF_NATIVE(pv_irq_ops, save_fl, NATIVE_SAVE_FL);
+DEF_NATIVE(pv_irq_ops, restore_fl, NATIVE_RESTORE_FL);
+DEF_NATIVE(pv_irq_ops, irq_disable, NATIVE_IRQ_DISABLE);
+DEF_NATIVE(pv_irq_ops, irq_enable, NATIVE_IRQ_ENABLE);
+DEF_NATIVE(pv_mmu_ops, read_cr2, NATIVE_READ_CR2);
+DEF_NATIVE(pv_mmu_ops, read_cr3, NATIVE_READ_CR3);
+DEF_NATIVE(pv_mmu_ops, write_cr3, NATIVE_WRITE_CR3);
+DEF_NATIVE(pv_mmu_ops, flush_tlb_single, NATIVE_FLUSH_TLB_SINGLE);

-DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
-DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
+DEF_NATIVE(pv_cpu_ops, usergs_sysret64, NATIVE_USERGS_SYSRET64);
+DEF_NATIVE(pv_cpu_ops, swapgs, NATIVE_SWAPGS);

-DEF_NATIVE(, mov32, "mov %edi, %eax");
-DEF_NATIVE(, mov64, "mov %rdi, %rax");
+DEF_NATIVE(, mov32, NATIVE_IDENTITY_32);
+DEF_NATIVE(, mov64, NATIVE_IDENTITY);

#if defined(CONFIG_PARAVIRT_SPINLOCKS)
-DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%rdi)");
-DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, "xor %rax, %rax");
+DEF_NATIVE(pv_lock_ops, queued_spin_unlock, NATIVE_QUEUED_SPIN_UNLOCK);
+DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, NATIVE_ZERO);
#endif

unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
--
2.13.6
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