linux/arch/m32r/include/asm/flat.h
Oskar Schirmer c3dc5bec05 flat: fix data sections alignment
The flat loader uses an architecture's flat_stack_align() to align the
stack but assumes word-alignment is enough for the data sections.

However, on the Xtensa S6000 we have registers up to 128bit width
which can be used from userspace and therefor need userspace stack and
data-section alignment of at least this size.

This patch drops flat_stack_align() and uses the same alignment that
is required for slab caches, ARCH_SLAB_MINALIGN, or wordsize if it's
not defined by the architecture.

It also fixes m32r which was obviously kaput, aligning an
uninitialized stack entry instead of the stack pointer.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Oskar Schirmer <os@emlix.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <cooloney@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Johannes Weiner <jw@emlix.com>
Acked-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-05-29 08:40:02 -07:00

146 lines
4.3 KiB
C

/*
* include/asm-m32r/flat.h
*
* uClinux flat-format executables
*
* Copyright (C) 2004 Kazuhiro Inaoka
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive for
* more details.
*/
#ifndef __ASM_M32R_FLAT_H
#define __ASM_M32R_FLAT_H
#define flat_argvp_envp_on_stack() 0
#define flat_old_ram_flag(flags) (flags)
#define flat_set_persistent(relval, p) 0
#define flat_reloc_valid(reloc, size) \
(((reloc) - textlen_for_m32r_lo16_data) <= (size))
#define flat_get_addr_from_rp(rp, relval, flags, persistent) \
m32r_flat_get_addr_from_rp(rp, relval, (text_len) )
#define flat_put_addr_at_rp(rp, addr, relval) \
m32r_flat_put_addr_at_rp(rp, addr, relval)
/* Convert a relocation entry into an address. */
static inline unsigned long
flat_get_relocate_addr (unsigned long relval)
{
return relval & 0x00ffffff; /* Mask out top 8-bits */
}
#define flat_m32r_get_reloc_type(relval) ((relval) >> 24)
#define M32R_SETH_OPCODE 0xd0c00000 /* SETH instruction code */
#define FLAT_M32R_32 0x00 /* 32bits reloc */
#define FLAT_M32R_24 0x01 /* unsigned 24bits reloc */
#define FLAT_M32R_16 0x02 /* 16bits reloc */
#define FLAT_M32R_LO16 0x03 /* signed low 16bits reloc (low()) */
#define FLAT_M32R_LO16_DATA 0x04 /* signed low 16bits reloc (low())
for a symbol in .data section */
/* High 16bits of an address used
when the lower 16bbits are treated
as unsigned.
To create SETH instruction only.
0x1X: X means a number of register.
0x10 - 0x3F are reserved. */
#define FLAT_M32R_HI16_ULO 0x10 /* reloc for SETH Rn,#high(imm16) */
/* High 16bits of an address used
when the lower 16bbits are treated
as signed.
To create SETH instruction only.
0x2X: X means a number of register.
0x20 - 0x4F are reserved. */
#define FLAT_M32R_HI16_SLO 0x20 /* reloc for SETH Rn,#shigh(imm16) */
static unsigned long textlen_for_m32r_lo16_data = 0;
static inline unsigned long m32r_flat_get_addr_from_rp (unsigned long *rp,
unsigned long relval,
unsigned long textlen)
{
unsigned int reloc = flat_m32r_get_reloc_type (relval);
textlen_for_m32r_lo16_data = 0;
if (reloc & 0xf0) {
unsigned long addr = htonl(*rp);
switch (reloc & 0xf0)
{
case FLAT_M32R_HI16_ULO:
case FLAT_M32R_HI16_SLO:
if (addr == 0) {
/* put "seth Rn,#0x0" instead of 0 (addr). */
*rp = (M32R_SETH_OPCODE | ((reloc & 0x0f)<<24));
}
return addr;
default:
break;
}
} else {
switch (reloc)
{
case FLAT_M32R_LO16:
return htonl(*rp) & 0xFFFF;
case FLAT_M32R_LO16_DATA:
/* FIXME: The return value will decrease by textlen
at m32r_flat_put_addr_at_rp () */
textlen_for_m32r_lo16_data = textlen;
return (htonl(*rp) & 0xFFFF) + textlen;
case FLAT_M32R_16:
return htons(*(unsigned short *)rp) & 0xFFFF;
case FLAT_M32R_24:
return htonl(*rp) & 0xFFFFFF;
case FLAT_M32R_32:
return htonl(*rp);
default:
break;
}
}
return ~0; /* bogus value */
}
static inline void m32r_flat_put_addr_at_rp (unsigned long *rp,
unsigned long addr,
unsigned long relval)
{
unsigned int reloc = flat_m32r_get_reloc_type (relval);
if (reloc & 0xf0) {
unsigned long Rn = reloc & 0x0f; /* get a number of register */
Rn <<= 24; /* 0x0R000000 */
reloc &= 0xf0;
switch (reloc)
{
case FLAT_M32R_HI16_ULO: /* To create SETH Rn,#high(imm16) */
*rp = (M32R_SETH_OPCODE | Rn
| ((addr >> 16) & 0xFFFF));
break;
case FLAT_M32R_HI16_SLO: /* To create SETH Rn,#shigh(imm16) */
*rp = (M32R_SETH_OPCODE | Rn
| (((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
& 0xFFFF));
break;
}
} else {
switch (reloc) {
case FLAT_M32R_LO16_DATA:
addr -= textlen_for_m32r_lo16_data;
textlen_for_m32r_lo16_data = 0;
case FLAT_M32R_LO16:
*rp = (htonl(*rp) & 0xFFFF0000) | (addr & 0xFFFF);
break;
case FLAT_M32R_16:
*(unsigned short *)rp = addr & 0xFFFF;
break;
case FLAT_M32R_24:
*rp = (htonl(*rp) & 0xFF000000) | (addr & 0xFFFFFF);
break;
case FLAT_M32R_32:
*rp = addr;
break;
}
}
}
#endif /* __ASM_M32R_FLAT_H */