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Merge branch 'core/objtool' into x86/asm, to pick up dependent changes

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2017-10-23 13:31:17 +02:00
commit bae9525531
6 changed files with 32 additions and 23 deletions
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1
arch/x86/kernel/Makefile
View file

@ -26,7 +26,6 @@ KASAN_SANITIZE_dumpstack.o := n
KASAN_SANITIZE_dumpstack_$(BITS).o := n
KASAN_SANITIZE_stacktrace.o := n
OBJECT_FILES_NON_STANDARD_head_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_ftrace_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_test_nx.o := y

27
arch/x86/kernel/head_64.S
View file

@ -49,6 +49,7 @@ L3_START_KERNEL = pud_index(__START_KERNEL_map)
.code64
.globl startup_64
startup_64:
UNWIND_HINT_EMPTY
/*
* At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
* and someone has loaded an identity mapped page table
@ -88,6 +89,7 @@ startup_64:
addq $(early_top_pgt - __START_KERNEL_map), %rax
jmp 1f
ENTRY(secondary_startup_64)
UNWIND_HINT_EMPTY
/*
* At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
* and someone has loaded a mapped page table.
@ -132,6 +134,7 @@ ENTRY(secondary_startup_64)
movq $1f, %rax
jmp *%rax
1:
UNWIND_HINT_EMPTY
/* Check if nx is implemented */
movl $0x80000001, %eax
@ -234,7 +237,7 @@ ENTRY(secondary_startup_64)
pushq %rax # target address in negative space
lretq
.Lafter_lret:
ENDPROC(secondary_startup_64)
END(secondary_startup_64)
#include "verify_cpu.S"
@ -246,6 +249,7 @@ ENDPROC(secondary_startup_64)
*/
ENTRY(start_cpu0)
movq initial_stack(%rip), %rsp
UNWIND_HINT_EMPTY
jmp .Ljump_to_C_code
ENDPROC(start_cpu0)
#endif
@ -265,26 +269,24 @@ ENDPROC(start_cpu0)
.quad init_thread_union + THREAD_SIZE - SIZEOF_PTREGS
__FINITDATA
bad_address:
jmp bad_address
__INIT
ENTRY(early_idt_handler_array)
# 104(%rsp) %rflags
# 96(%rsp) %cs
# 88(%rsp) %rip
# 80(%rsp) error code
i = 0
.rept NUM_EXCEPTION_VECTORS
.ifeq (EXCEPTION_ERRCODE_MASK >> i) & 1
pushq $0 # Dummy error code, to make stack frame uniform
UNWIND_HINT_IRET_REGS
pushq $0 # Dummy error code, to make stack frame uniform
.else
UNWIND_HINT_IRET_REGS offset=8
.endif
pushq $i # 72(%rsp) Vector number
jmp early_idt_handler_common
UNWIND_HINT_IRET_REGS
i = i + 1
.fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc
.endr
ENDPROC(early_idt_handler_array)
UNWIND_HINT_IRET_REGS offset=16
END(early_idt_handler_array)
early_idt_handler_common:
/*
@ -312,6 +314,7 @@ early_idt_handler_common:
pushq %r13 /* pt_regs->r13 */
pushq %r14 /* pt_regs->r14 */
pushq %r15 /* pt_regs->r15 */
UNWIND_HINT_REGS
cmpq $14,%rsi /* Page fault? */
jnz 10f
@ -327,7 +330,7 @@ early_idt_handler_common:
20:
decl early_recursion_flag(%rip)
jmp restore_regs_and_iret
ENDPROC(early_idt_handler_common)
END(early_idt_handler_common)
__INITDATA
@ -434,7 +437,7 @@ ENTRY(phys_base)
EXPORT_SYMBOL(phys_base)
#include "../../x86/xen/xen-head.S"
__PAGE_ALIGNED_BSS
NEXT_PAGE(empty_zero_page)
.skip PAGE_SIZE

3
arch/x86/kernel/verify_cpu.S
View file

@ -33,7 +33,7 @@
#include <asm/cpufeatures.h>
#include <asm/msr-index.h>
verify_cpu:
ENTRY(verify_cpu)
pushf # Save caller passed flags
push $0 # Kill any dangerous flags
popf
@ -139,3 +139,4 @@ verify_cpu:
popf # Restore caller passed flags
xorl %eax, %eax
ret
ENDPROC(verify_cpu)

11
arch/x86/xen/xen-head.S
View file

@ -9,6 +9,7 @@
#include <asm/boot.h>
#include <asm/asm.h>
#include <asm/page_types.h>
#include <asm/unwind_hints.h>
#include <xen/interface/elfnote.h>
#include <xen/interface/features.h>
@ -19,6 +20,7 @@
#ifdef CONFIG_XEN_PV
__INIT
ENTRY(startup_xen)
UNWIND_HINT_EMPTY
cld
/* Clear .bss */
@ -33,21 +35,24 @@ ENTRY(startup_xen)
mov $init_thread_union+THREAD_SIZE, %_ASM_SP
jmp xen_start_kernel
END(startup_xen)
__FINIT
#endif
.pushsection .text
.balign PAGE_SIZE
ENTRY(hypercall_page)
.skip PAGE_SIZE
.rept (PAGE_SIZE / 32)
UNWIND_HINT_EMPTY
.skip 32
.endr
#define HYPERCALL(n) \
.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
.type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
#include <asm/xen-hypercalls.h>
#undef HYPERCALL
END(hypercall_page)
.popsection
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")

7
tools/objtool/check.c
View file

@ -1752,11 +1752,14 @@ static int validate_branch(struct objtool_file *file, struct instruction *first,
if (insn->dead_end)
return 0;
insn = next_insn;
if (!insn) {
if (!next_insn) {
if (state.cfa.base == CFI_UNDEFINED)
return 0;
WARN("%s: unexpected end of section", sec->name);
return 1;
}
insn = next_insn;
}
return 0;

6
tools/objtool/objtool.c
View file

@ -70,7 +70,7 @@ static void cmd_usage(void)
printf("\n");
exit(1);
exit(129);
}
static void handle_options(int *argc, const char ***argv)
@ -86,9 +86,7 @@ static void handle_options(int *argc, const char ***argv)
break;
} else {
fprintf(stderr, "Unknown option: %s\n", cmd);
fprintf(stderr, "\n Usage: %s\n",
objtool_usage_string);
exit(1);
cmd_usage();
}
(*argv)++;