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/* Dump registers.
Copyright (C) 1998-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Schwab <schwab@gnu.org>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <stddef.h>
#include <sys/uio.h>
#include <_itoa.h>
/* We will print the register dump in this format:
D0: XXXXXXXX D1: XXXXXXXX D2: XXXXXXXX D3: XXXXXXXX
D4: XXXXXXXX D5: XXXXXXXX D6: XXXXXXXX D7: XXXXXXXX
A0: XXXXXXXX A1: XXXXXXXX A2: XXXXXXXX A3: XXXXXXXX
A4: XXXXXXXX A5: XXXXXXXX A6: XXXXXXXX A7: XXXXXXXX
PC: XXXXXXXX SR: XXXX
OldMask: XXXXXXXX Vector: XXXX
FP0: XXXXXXXXXXXXXXXXXXXXXXXX FP1: XXXXXXXXXXXXXXXXXXXXXXXX
FP2: XXXXXXXXXXXXXXXXXXXXXXXX FP3: XXXXXXXXXXXXXXXXXXXXXXXX
FP4: XXXXXXXXXXXXXXXXXXXXXXXX FP5: XXXXXXXXXXXXXXXXXXXXXXXX
FP6: XXXXXXXXXXXXXXXXXXXXXXXX FP7: XXXXXXXXXXXXXXXXXXXXXXXX
FPCR: XXXXXXXX FPSR: XXXXXXXX FPIAR: XXXXXXXX
*/
/* Linux saves only the call-clobbered registers in the sigcontext. We
need to use a trampoline that saves the rest so that the C code can
access them. We use the sc_fpstate field, since the handler is not
supposed to return anyway, thus it doesn't matter that it's clobbered. */
/* static */ void catch_segfault (int, int, struct sigcontext *);
/* Dummy function so that we can use asm with arguments. */
static void __attribute_used__
__dummy__ (void)
{
asm ("\n\
catch_segfault:\n\
move.l 12(%%sp),%%a0\n\
lea %c0(%%a0),%%a0\n\
/* Clear the first 4 bytes to make it a null fp state, just\n\
in case the handler does return. */\n\
clr.l (%%a0)+\n\
movem.l %%d2-%%d7/%%a2-%%a6,(%%a0)\n"
#ifndef __mcoldfire__
"fmovem.x %%fp2-%%fp7,11*4(%%a0)\n"
#elif defined __mcffpu__
"fmovem.d %%fp2-%%fp7,11*4(%%a0)\n"
#endif
"jra real_catch_segfault"
: : "n" (offsetof (struct sigcontext, sc_fpstate)));
}
#define catch_segfault(a,b) \
__attribute_used__ real_catch_segfault(a,b)
static void
hexvalue (unsigned long int value, char *buf, size_t len)
{
char *cp = _itoa_word (value, buf + len, 16, 0);
while (cp > buf)
*--cp = '0';
}
static void
register_dump (int fd, struct sigcontext *ctx)
{
char regs[20][8];
char fpregs[11][24];
struct iovec iov[63], *next_iov = iov;
unsigned long *p = (unsigned long *) ctx->sc_fpstate + 1;
unsigned long *pfp = (unsigned long *) ctx->sc_fpregs;
int i, j, fpreg_size;
#define ADD_STRING(str) \
next_iov->iov_base = (char *) (str); \
next_iov->iov_len = strlen (str); \
++next_iov
#define ADD_MEM(str, len) \
next_iov->iov_base = (str); \
next_iov->iov_len = (len); \
++next_iov
#ifdef __mcoldfire__
fpreg_size = 16;
#else
fpreg_size = 24;
#endif
/* Generate strings of register contents. */
hexvalue (ctx->sc_d0, regs[0], 8);
hexvalue (ctx->sc_d1, regs[1], 8);
hexvalue (*p++, regs[2], 8);
hexvalue (*p++, regs[3], 8);
hexvalue (*p++, regs[4], 8);
hexvalue (*p++, regs[5], 8);
hexvalue (*p++, regs[6], 8);
hexvalue (*p++, regs[7], 8);
hexvalue (ctx->sc_a0, regs[8], 8);
hexvalue (ctx->sc_a1, regs[9], 8);
hexvalue (*p++, regs[10], 8);
hexvalue (*p++, regs[11], 8);
hexvalue (*p++, regs[12], 8);
hexvalue (*p++, regs[13], 8);
hexvalue (*p++, regs[14], 8);
hexvalue (ctx->sc_usp, regs[15], 8);
hexvalue (ctx->sc_pc, regs[16], 8);
hexvalue (ctx->sc_sr, regs[17], 4);
hexvalue (ctx->sc_mask, regs[18], 8);
hexvalue (ctx->sc_formatvec & 0xfff, regs[19], 4);
for (i = 0; i < 2; i++)
for (j = 0; j < fpreg_size; j += 8)
hexvalue (*pfp++, fpregs[i] + j, 8);
for (i = 2; i < 8; i++)
for (j = 0; j < fpreg_size; j += 8)
hexvalue (*p++, fpregs[i] + j, 8);
hexvalue (ctx->sc_fpcntl[0], fpregs[8], 8);
hexvalue (ctx->sc_fpcntl[1], fpregs[9], 8);
hexvalue (ctx->sc_fpcntl[2], fpregs[10], 8);
/* Generate the output. */
ADD_STRING ("Register dump:\n\n D0: ");
ADD_MEM (regs[0], 8);
ADD_STRING (" D1: ");
ADD_MEM (regs[1], 8);
ADD_STRING (" D2: ");
ADD_MEM (regs[2], 8);
ADD_STRING (" D3: ");
ADD_MEM (regs[3], 8);
ADD_STRING ("\n D4: ");
ADD_MEM (regs[4], 8);
ADD_STRING (" D5: ");
ADD_MEM (regs[5], 8);
ADD_STRING (" D6: ");
ADD_MEM (regs[6], 8);
ADD_STRING (" D7: ");
ADD_MEM (regs[7], 8);
ADD_STRING ("\n A0: ");
ADD_MEM (regs[8], 8);
ADD_STRING (" A1: ");
ADD_MEM (regs[9], 8);
ADD_STRING (" A2: ");
ADD_MEM (regs[10], 8);
ADD_STRING (" A3: ");
ADD_MEM (regs[11], 8);
ADD_STRING ("\n A4: ");
ADD_MEM (regs[12], 8);
ADD_STRING (" A5: ");
ADD_MEM (regs[13], 8);
ADD_STRING (" A6: ");
ADD_MEM (regs[14], 8);
ADD_STRING (" A7: ");
ADD_MEM (regs[15], 8);
ADD_STRING ("\n PC: ");
ADD_MEM (regs[16], 8);
ADD_STRING (" SR: ");
ADD_MEM (regs[17], 4);
ADD_STRING ("\n\n OldMask: ");
ADD_MEM (regs[18], 8);
ADD_STRING (" Vector: ");
ADD_MEM (regs[19], 4);
ADD_STRING ("\n\n FP0: ");
ADD_MEM (fpregs[0], fpreg_size);
ADD_STRING (" FP1: ");
ADD_MEM (fpregs[1], fpreg_size);
ADD_STRING ("\n FP2: ");
ADD_MEM (fpregs[2], fpreg_size);
ADD_STRING (" FP3: ");
ADD_MEM (fpregs[3], fpreg_size);
ADD_STRING ("\n FP4: ");
ADD_MEM (fpregs[4], fpreg_size);
ADD_STRING (" FP5: ");
ADD_MEM (fpregs[5], fpreg_size);
ADD_STRING ("\n FP6: ");
ADD_MEM (fpregs[6], fpreg_size);
ADD_STRING (" FP7: ");
ADD_MEM (fpregs[7], fpreg_size);
ADD_STRING ("\n FPCR: ");
ADD_MEM (fpregs[8], 8);
ADD_STRING (" FPSR: ");
ADD_MEM (fpregs[9], 8);
ADD_STRING (" FPIAR: ");
ADD_MEM (fpregs[10], 8);
ADD_STRING ("\n");
/* Write the stuff out. */
writev (fd, iov, next_iov - iov);
}
#define REGISTER_DUMP register_dump (fd, ctx)
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