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/*
* 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 elf32_hdr *ehdr = _ehdr;
struct elf32_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 elf32_hdr *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 elf32_hdr *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)
{
if (config_enabled(CONFIG_FP32XX_HYBRID_FPRS)) {
/*
* Use hybrid FPRs for all code which can correctly execute
* with that mode.
*/
switch (state->overall_abi) {
case MIPS_ABI_FP_DOUBLE:
case MIPS_ABI_FP_SINGLE:
case MIPS_ABI_FP_SOFT:
case MIPS_ABI_FP_XX:
case MIPS_ABI_FP_ANY:
/* FR=1, FRE=1 */
clear_thread_flag(TIF_32BIT_FPREGS);
set_thread_flag(TIF_HYBRID_FPREGS);
return;
}
}
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();
}
}
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