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MIPS: ELF: Set FP mode according to .MIPS.abiflags

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This patch reads the .MIPS.abiflags section when it is present, and sets
the FP mode of the task accordingly. Any loaded ELF files which do not
contain a .MIPS.abiflags section will continue to observe the previous
behaviour, that is FR=1 if EF_MIPS_FP64 is set else FR=0.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7681/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2014-09-11 08:30:22 +01:00 committed by Ralf Baechle
parent 6cd962292d
commit 90cee759f0
4 changed files with 211 additions and 20 deletions
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1
arch/mips/Kconfig
View File

@ -53,6 +53,7 @@ config MIPS
select HAVE_CC_STACKPROTECTOR
select CPU_PM if CPU_IDLE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_BINFMT_ELF_STATE
menu "Machine selection"

50
arch/mips/include/asm/elf.h
View File

@ -8,6 +8,8 @@
#ifndef _ASM_ELF_H
#define _ASM_ELF_H
#include <linux/fs.h>
#include <uapi/linux/elf.h>
/* ELF header e_flags defines. */
/* MIPS architecture level. */
@ -287,18 +289,13 @@ extern struct mips_abi mips_abi_n32;
#ifdef CONFIG_32BIT
#define SET_PERSONALITY(ex) \
#define SET_PERSONALITY2(ex, state) \
do { \
if ((ex).e_flags & EF_MIPS_FP64) \
clear_thread_flag(TIF_32BIT_FPREGS); \
else \
set_thread_flag(TIF_32BIT_FPREGS); \
\
clear_thread_flag(TIF_HYBRID_FPREGS); \
\
if (personality(current->personality) != PER_LINUX) \
set_personality(PER_LINUX); \
\
mips_set_personality_fp(state); \
\
current->thread.abi = &mips_abi; \
} while (0)
@ -318,35 +315,34 @@ do { \
#endif
#ifdef CONFIG_MIPS32_O32
#define __SET_PERSONALITY32_O32(ex) \
#define __SET_PERSONALITY32_O32(ex, state) \
do { \
set_thread_flag(TIF_32BIT_REGS); \
set_thread_flag(TIF_32BIT_ADDR); \
\
if (!((ex).e_flags & EF_MIPS_FP64)) \
set_thread_flag(TIF_32BIT_FPREGS); \
mips_set_personality_fp(state); \
\
current->thread.abi = &mips_abi_32; \
} while (0)
#else
#define __SET_PERSONALITY32_O32(ex) \
#define __SET_PERSONALITY32_O32(ex, state) \
do { } while (0)
#endif
#ifdef CONFIG_MIPS32_COMPAT
#define __SET_PERSONALITY32(ex) \
#define __SET_PERSONALITY32(ex, state) \
do { \
if ((((ex).e_flags & EF_MIPS_ABI2) != 0) && \
((ex).e_flags & EF_MIPS_ABI) == 0) \
__SET_PERSONALITY32_N32(); \
else \
__SET_PERSONALITY32_O32(ex); \
__SET_PERSONALITY32_O32(ex, state); \
} while (0)
#else
#define __SET_PERSONALITY32(ex) do { } while (0)
#define __SET_PERSONALITY32(ex, state) do { } while (0)
#endif
#define SET_PERSONALITY(ex) \
#define SET_PERSONALITY2(ex, state) \
do { \
unsigned int p; \
\
@ -356,7 +352,7 @@ do { \
clear_thread_flag(TIF_32BIT_ADDR); \
\
if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
__SET_PERSONALITY32(ex); \
__SET_PERSONALITY32(ex, state); \
else \
current->thread.abi = &mips_abi; \
\
@ -418,4 +414,24 @@ struct mm_struct;
extern unsigned long arch_randomize_brk(struct mm_struct *mm);
#define arch_randomize_brk arch_randomize_brk
struct arch_elf_state {
int fp_abi;
int interp_fp_abi;
int overall_abi;
};
#define INIT_ARCH_ELF_STATE { \
.fp_abi = -1, \
.interp_fp_abi = -1, \
.overall_abi = -1, \
}
extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
bool is_interp, struct arch_elf_state *state);
extern int arch_check_elf(void *ehdr, bool has_interpreter,
struct arch_elf_state *state);
extern void mips_set_personality_fp(struct arch_elf_state *state);
#endif /* _ASM_ELF_H */

7
arch/mips/kernel/Makefile
View File

@ -4,9 +4,10 @@
extra-y := head.o vmlinux.lds
obj-y += cpu-probe.o branch.o entry.o genex.o idle.o irq.o process.o \
prom.o ptrace.o reset.o setup.o signal.o syscall.o \
time.o topology.o traps.o unaligned.o watch.o vdso.o
obj-y += cpu-probe.o branch.o elf.o entry.o genex.o idle.o irq.o \
process.o prom.o ptrace.o reset.o setup.o signal.o \
syscall.o time.o topology.o traps.o unaligned.o watch.o \
vdso.o
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_ftrace.o = -pg

173
arch/mips/kernel/elf.c Normal file
View File

@ -0,0 +1,173 @@
/*
* Copyright (C) 2014 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/elf.h>
#include <linux/sched.h>
enum {
FP_ERROR = -1,
FP_DOUBLE_64A = -2,
};
int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf,
bool is_interp, struct arch_elf_state *state)
{
struct elfhdr *ehdr = _ehdr;
struct elf_phdr *phdr = _phdr;
struct mips_elf_abiflags_v0 abiflags;
int ret;
if (config_enabled(CONFIG_64BIT) &&
(ehdr->e_ident[EI_CLASS] != ELFCLASS32))
return 0;
if (phdr->p_type != PT_MIPS_ABIFLAGS)
return 0;
if (phdr->p_filesz < sizeof(abiflags))
return -EINVAL;
ret = kernel_read(elf, phdr->p_offset, (char *)&abiflags,
sizeof(abiflags));
if (ret < 0)
return ret;
if (ret != sizeof(abiflags))
return -EIO;
/* Record the required FP ABIs for use by mips_check_elf */
if (is_interp)
state->interp_fp_abi = abiflags.fp_abi;
else
state->fp_abi = abiflags.fp_abi;
return 0;
}
static inline unsigned get_fp_abi(struct elfhdr *ehdr, int in_abi)
{
/* If the ABI requirement is provided, simply return that */
if (in_abi != -1)
return in_abi;
/* If the EF_MIPS_FP64 flag was set, return MIPS_ABI_FP_64 */
if (ehdr->e_flags & EF_MIPS_FP64)
return MIPS_ABI_FP_64;
/* Default to MIPS_ABI_FP_DOUBLE */
return MIPS_ABI_FP_DOUBLE;
}
int arch_check_elf(void *_ehdr, bool has_interpreter,
struct arch_elf_state *state)
{
struct elfhdr *ehdr = _ehdr;
unsigned fp_abi, interp_fp_abi, abi0, abi1;
/* Ignore non-O32 binaries */
if (config_enabled(CONFIG_64BIT) &&
(ehdr->e_ident[EI_CLASS] != ELFCLASS32))
return 0;
fp_abi = get_fp_abi(ehdr, state->fp_abi);
if (has_interpreter) {
interp_fp_abi = get_fp_abi(ehdr, state->interp_fp_abi);
abi0 = min(fp_abi, interp_fp_abi);
abi1 = max(fp_abi, interp_fp_abi);
} else {
abi0 = abi1 = fp_abi;
}
state->overall_abi = FP_ERROR;
if (abi0 == abi1) {
state->overall_abi = abi0;
} else if (abi0 == MIPS_ABI_FP_ANY) {
state->overall_abi = abi1;
} else if (abi0 == MIPS_ABI_FP_DOUBLE) {
switch (abi1) {
case MIPS_ABI_FP_XX:
state->overall_abi = MIPS_ABI_FP_DOUBLE;
break;
case MIPS_ABI_FP_64A:
state->overall_abi = FP_DOUBLE_64A;
break;
}
} else if (abi0 == MIPS_ABI_FP_SINGLE ||
abi0 == MIPS_ABI_FP_SOFT) {
/* Cannot link with other ABIs */
} else if (abi0 == MIPS_ABI_FP_OLD_64) {
switch (abi1) {
case MIPS_ABI_FP_XX:
case MIPS_ABI_FP_64:
case MIPS_ABI_FP_64A:
state->overall_abi = MIPS_ABI_FP_64;
break;
}
} else if (abi0 == MIPS_ABI_FP_XX ||
abi0 == MIPS_ABI_FP_64 ||
abi0 == MIPS_ABI_FP_64A) {
state->overall_abi = MIPS_ABI_FP_64;
}
switch (state->overall_abi) {
case MIPS_ABI_FP_64:
case MIPS_ABI_FP_64A:
case FP_DOUBLE_64A:
if (!config_enabled(CONFIG_MIPS_O32_FP64_SUPPORT))
return -ELIBBAD;
break;
case FP_ERROR:
return -ELIBBAD;
}
return 0;
}
void mips_set_personality_fp(struct arch_elf_state *state)
{
switch (state->overall_abi) {
case MIPS_ABI_FP_DOUBLE:
case MIPS_ABI_FP_SINGLE:
case MIPS_ABI_FP_SOFT:
/* FR=0 */
set_thread_flag(TIF_32BIT_FPREGS);
clear_thread_flag(TIF_HYBRID_FPREGS);
break;
case FP_DOUBLE_64A:
/* FR=1, FRE=1 */
clear_thread_flag(TIF_32BIT_FPREGS);
set_thread_flag(TIF_HYBRID_FPREGS);
break;
case MIPS_ABI_FP_64:
case MIPS_ABI_FP_64A:
/* FR=1, FRE=0 */
clear_thread_flag(TIF_32BIT_FPREGS);
clear_thread_flag(TIF_HYBRID_FPREGS);
break;
case MIPS_ABI_FP_XX:
case MIPS_ABI_FP_ANY:
if (!config_enabled(CONFIG_MIPS_O32_FP64_SUPPORT))
set_thread_flag(TIF_32BIT_FPREGS);
else
clear_thread_flag(TIF_32BIT_FPREGS);
clear_thread_flag(TIF_HYBRID_FPREGS);
break;
default:
case FP_ERROR:
BUG();
}
}