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linux/arch/powerpc/kernel/vdso64/sigtramp.S

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/*
* Signal trampoline for 64 bits processes in a ppc64 kernel for
* use in the vDSO
*
* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
* Copyright (C) 2004 Alan Modra (amodra@au.ibm.com)), IBM Corp.
*
* 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 <asm/processor.h>
#include <asm/ppc_asm.h>
#include <asm/unistd.h>
#include <asm/vdso.h>
powerpc: Make some #includes explicit. In preparation for merging processor.h, this adds some explicit but won't be after the merge. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-10-10 04:14:55 +00:00
#include <asm/ptrace.h> /* XXX for __SIGNAL_FRAMESIZE */
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
.text
/* The nop here is a hack. The dwarf2 unwind routines subtract 1 from
the return address to get an address in the middle of the presumed
Fix common misspellings Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-31 01:57:33 +00:00
call instruction. Since we don't have a call here, we artificially
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
extend the range covered by the unwind info by padding before the
real start. */
nop
.balign 8
V_FUNCTION_BEGIN(__kernel_sigtramp_rt64)
.Lsigrt_start = . - 4
addi r1, r1, __SIGNAL_FRAMESIZE
li r0,__NR_rt_sigreturn
sc
.Lsigrt_end:
V_FUNCTION_END(__kernel_sigtramp_rt64)
/* The ".balign 8" above and the following zeros mimic the old stack
trampoline layout. The last magic value is the ucontext pointer,
chosen in such a way that older libgcc unwind code returns a zero
for a sigcontext pointer. */
.long 0,0,0
.quad 0,-21*8
/* Register r1 can be found at offset 8 of a pt_regs structure.
A pointer to the pt_regs is stored in memory at the old sp plus PTREGS. */
#define cfa_save \
.byte 0x0f; /* DW_CFA_def_cfa_expression */ \
.uleb128 9f - 1f; /* length */ \
1: \
.byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \
.byte 0x06; /* DW_OP_deref */ \
.byte 0x23; .uleb128 RSIZE; /* DW_OP_plus_uconst */ \
.byte 0x06; /* DW_OP_deref */ \
9:
/* Register REGNO can be found at offset OFS of a pt_regs structure.
A pointer to the pt_regs is stored in memory at the old sp plus PTREGS. */
#define rsave(regno, ofs) \
.byte 0x10; /* DW_CFA_expression */ \
.uleb128 regno; /* regno */ \
.uleb128 9f - 1f; /* length */ \
1: \
.byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \
.byte 0x06; /* DW_OP_deref */ \
.ifne ofs; \
.byte 0x23; .uleb128 ofs; /* DW_OP_plus_uconst */ \
.endif; \
9:
/* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16
of the VMX reg struct. A pointer to the VMX reg struct is at VREGS in
the pt_regs struct. This macro is for REGNO == 0, and contains
'subroutines' that the other macros jump to. */
#define vsave_msr0(regno) \
.byte 0x10; /* DW_CFA_expression */ \
.uleb128 regno + 77; /* regno */ \
.uleb128 9f - 1f; /* length */ \
1: \
.byte 0x30 + regno; /* DW_OP_lit0 */ \
2: \
.byte 0x40; /* DW_OP_lit16 */ \
.byte 0x1e; /* DW_OP_mul */ \
3: \
.byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \
.byte 0x06; /* DW_OP_deref */ \
.byte 0x12; /* DW_OP_dup */ \
.byte 0x23; /* DW_OP_plus_uconst */ \
.uleb128 33*RSIZE; /* msr offset */ \
.byte 0x06; /* DW_OP_deref */ \
.byte 0x0c; .long 1 << 25; /* DW_OP_const4u */ \
.byte 0x1a; /* DW_OP_and */ \
.byte 0x12; /* DW_OP_dup, ret 0 if bra taken */ \
.byte 0x30; /* DW_OP_lit0 */ \
.byte 0x29; /* DW_OP_eq */ \
.byte 0x28; .short 0x7fff; /* DW_OP_bra to end */ \
.byte 0x13; /* DW_OP_drop, pop the 0 */ \
.byte 0x23; .uleb128 VREGS; /* DW_OP_plus_uconst */ \
.byte 0x06; /* DW_OP_deref */ \
.byte 0x22; /* DW_OP_plus */ \
.byte 0x2f; .short 0x7fff; /* DW_OP_skip to end */ \
9:
/* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16
of the VMX reg struct. REGNO is 1 thru 31. */
#define vsave_msr1(regno) \
.byte 0x10; /* DW_CFA_expression */ \
.uleb128 regno + 77; /* regno */ \
.uleb128 9f - 1f; /* length */ \
1: \
.byte 0x30 + regno; /* DW_OP_lit n */ \
.byte 0x2f; .short 2b - 9f; /* DW_OP_skip */ \
9:
/* If msr bit 1<<25 is set, then VMX register REGNO is at offset OFS of
the VMX save block. */
#define vsave_msr2(regno, ofs) \
.byte 0x10; /* DW_CFA_expression */ \
.uleb128 regno + 77; /* regno */ \
.uleb128 9f - 1f; /* length */ \
1: \
.byte 0x0a; .short ofs; /* DW_OP_const2u */ \
.byte 0x2f; .short 3b - 9f; /* DW_OP_skip */ \
9:
/* VMX register REGNO is at offset OFS of the VMX save area. */
#define vsave(regno, ofs) \
.byte 0x10; /* DW_CFA_expression */ \
.uleb128 regno + 77; /* regno */ \
.uleb128 9f - 1f; /* length */ \
1: \
.byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \
.byte 0x06; /* DW_OP_deref */ \
.byte 0x23; .uleb128 VREGS; /* DW_OP_plus_uconst */ \
.byte 0x06; /* DW_OP_deref */ \
.byte 0x23; .uleb128 ofs; /* DW_OP_plus_uconst */ \
9:
/* This is where the pt_regs pointer can be found on the stack. */
[POWERPC] Fix 64 bits vDSO DWARF info for CR register The current DWARF info for CR are incorrect, causing the gcc unwinder to go to lunch if we take a segfault in the vdso. This fixes it. Problem identified by Andrew Haley, and fix provided by Jakub Jelinek (thanks !). Unfortunately, a bug in gcc cause it to not quite work either, but that is being fixed separately with something around the lines of: linux-unwind.h: fs->regs.reg[R_CR2].loc.offset = (long) &regs->ccr - new_cfa; + /* CR? regs are just 32-bit and PPC is big-endian. */ + fs->regs.reg[R_CR2].loc.offset += sizeof (long) - 4; (According to Jakub) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-17 04:26:50 +00:00
#define PTREGS 128+168+56
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* Size of regs. */
[POWERPC] Fix 64 bits vDSO DWARF info for CR register The current DWARF info for CR are incorrect, causing the gcc unwinder to go to lunch if we take a segfault in the vdso. This fixes it. Problem identified by Andrew Haley, and fix provided by Jakub Jelinek (thanks !). Unfortunately, a bug in gcc cause it to not quite work either, but that is being fixed separately with something around the lines of: linux-unwind.h: fs->regs.reg[R_CR2].loc.offset = (long) &regs->ccr - new_cfa; + /* CR? regs are just 32-bit and PPC is big-endian. */ + fs->regs.reg[R_CR2].loc.offset += sizeof (long) - 4; (According to Jakub) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-17 04:26:50 +00:00
#define RSIZE 8
/* Size of CR reg in DWARF unwind info. */
#define CRSIZE 4
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
powerpc: Wrong DWARF CFI in the kernel vdso for little-endian / ELFv2 I've finally tracked down why my CR signal-unwind test case still fails on little-endian. The problem turned to be that the kernel installs a signal trampoline in the vDSO, and provides a DWARF CFI record for that trampoline. This CFI describes the save location for CR: rsave (70, 38*RSIZE + (RSIZE - CRSIZE)) which is correct for big-endian, but points to the wrong word on little-endian. This is wrong no matter which ABI. In addition, for the ELFv2 ABI, we should not only provide a CFI record for register 70 (cr2), but for all CR fields separately. Strictly speaking, I guess this would mean providing two separate vDSO images, one for ELFv1 processes and one for ELFv2 processes (or maybe playing some tricks with conditional DWARF expressions). However, having CFI records for the other CR fields in ELFv1 is not actually wrong, they just will be ignored. So it seems the simplest fix would be just to always provide CFI for all the fields. Signed-off-by: Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-11-20 20:38:05 +00:00
/* Offset of CR reg within a full word. */
#ifdef __LITTLE_ENDIAN__
#define CROFF 0
#else
#define CROFF (RSIZE - CRSIZE)
#endif
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* This is the offset of the VMX reg pointer. */
[POWERPC] Fix 64 bits vDSO DWARF info for CR register The current DWARF info for CR are incorrect, causing the gcc unwinder to go to lunch if we take a segfault in the vdso. This fixes it. Problem identified by Andrew Haley, and fix provided by Jakub Jelinek (thanks !). Unfortunately, a bug in gcc cause it to not quite work either, but that is being fixed separately with something around the lines of: linux-unwind.h: fs->regs.reg[R_CR2].loc.offset = (long) &regs->ccr - new_cfa; + /* CR? regs are just 32-bit and PPC is big-endian. */ + fs->regs.reg[R_CR2].loc.offset += sizeof (long) - 4; (According to Jakub) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-17 04:26:50 +00:00
#define VREGS 48*RSIZE+33*8
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* Describe where general purpose regs are saved. */
#define EH_FRAME_GEN \
cfa_save; \
rsave ( 0, 0*RSIZE); \
rsave ( 2, 2*RSIZE); \
rsave ( 3, 3*RSIZE); \
rsave ( 4, 4*RSIZE); \
rsave ( 5, 5*RSIZE); \
rsave ( 6, 6*RSIZE); \
rsave ( 7, 7*RSIZE); \
rsave ( 8, 8*RSIZE); \
rsave ( 9, 9*RSIZE); \
rsave (10, 10*RSIZE); \
rsave (11, 11*RSIZE); \
rsave (12, 12*RSIZE); \
rsave (13, 13*RSIZE); \
rsave (14, 14*RSIZE); \
rsave (15, 15*RSIZE); \
rsave (16, 16*RSIZE); \
rsave (17, 17*RSIZE); \
rsave (18, 18*RSIZE); \
rsave (19, 19*RSIZE); \
rsave (20, 20*RSIZE); \
rsave (21, 21*RSIZE); \
rsave (22, 22*RSIZE); \
rsave (23, 23*RSIZE); \
rsave (24, 24*RSIZE); \
rsave (25, 25*RSIZE); \
rsave (26, 26*RSIZE); \
rsave (27, 27*RSIZE); \
rsave (28, 28*RSIZE); \
rsave (29, 29*RSIZE); \
rsave (30, 30*RSIZE); \
rsave (31, 31*RSIZE); \
rsave (67, 32*RSIZE); /* ap, used as temp for nip */ \
rsave (65, 36*RSIZE); /* lr */ \
powerpc: Wrong DWARF CFI in the kernel vdso for little-endian / ELFv2 I've finally tracked down why my CR signal-unwind test case still fails on little-endian. The problem turned to be that the kernel installs a signal trampoline in the vDSO, and provides a DWARF CFI record for that trampoline. This CFI describes the save location for CR: rsave (70, 38*RSIZE + (RSIZE - CRSIZE)) which is correct for big-endian, but points to the wrong word on little-endian. This is wrong no matter which ABI. In addition, for the ELFv2 ABI, we should not only provide a CFI record for register 70 (cr2), but for all CR fields separately. Strictly speaking, I guess this would mean providing two separate vDSO images, one for ELFv1 processes and one for ELFv2 processes (or maybe playing some tricks with conditional DWARF expressions). However, having CFI records for the other CR fields in ELFv1 is not actually wrong, they just will be ignored. So it seems the simplest fix would be just to always provide CFI for all the fields. Signed-off-by: Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-11-20 20:38:05 +00:00
rsave (68, 38*RSIZE + CROFF); /* cr fields */ \
rsave (69, 38*RSIZE + CROFF); \
rsave (70, 38*RSIZE + CROFF); \
rsave (71, 38*RSIZE + CROFF); \
rsave (72, 38*RSIZE + CROFF); \
rsave (73, 38*RSIZE + CROFF); \
rsave (74, 38*RSIZE + CROFF); \
rsave (75, 38*RSIZE + CROFF)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* Describe where the FP regs are saved. */
#define EH_FRAME_FP \
rsave (32, 48*RSIZE + 0*8); \
rsave (33, 48*RSIZE + 1*8); \
rsave (34, 48*RSIZE + 2*8); \
rsave (35, 48*RSIZE + 3*8); \
rsave (36, 48*RSIZE + 4*8); \
rsave (37, 48*RSIZE + 5*8); \
rsave (38, 48*RSIZE + 6*8); \
rsave (39, 48*RSIZE + 7*8); \
rsave (40, 48*RSIZE + 8*8); \
rsave (41, 48*RSIZE + 9*8); \
rsave (42, 48*RSIZE + 10*8); \
rsave (43, 48*RSIZE + 11*8); \
rsave (44, 48*RSIZE + 12*8); \
rsave (45, 48*RSIZE + 13*8); \
rsave (46, 48*RSIZE + 14*8); \
rsave (47, 48*RSIZE + 15*8); \
rsave (48, 48*RSIZE + 16*8); \
rsave (49, 48*RSIZE + 17*8); \
rsave (50, 48*RSIZE + 18*8); \
rsave (51, 48*RSIZE + 19*8); \
rsave (52, 48*RSIZE + 20*8); \
rsave (53, 48*RSIZE + 21*8); \
rsave (54, 48*RSIZE + 22*8); \
rsave (55, 48*RSIZE + 23*8); \
rsave (56, 48*RSIZE + 24*8); \
rsave (57, 48*RSIZE + 25*8); \
rsave (58, 48*RSIZE + 26*8); \
rsave (59, 48*RSIZE + 27*8); \
rsave (60, 48*RSIZE + 28*8); \
rsave (61, 48*RSIZE + 29*8); \
rsave (62, 48*RSIZE + 30*8); \
rsave (63, 48*RSIZE + 31*8)
/* Describe where the VMX regs are saved. */
#ifdef CONFIG_ALTIVEC
#define EH_FRAME_VMX \
vsave_msr0 ( 0); \
vsave_msr1 ( 1); \
vsave_msr1 ( 2); \
vsave_msr1 ( 3); \
vsave_msr1 ( 4); \
vsave_msr1 ( 5); \
vsave_msr1 ( 6); \
vsave_msr1 ( 7); \
vsave_msr1 ( 8); \
vsave_msr1 ( 9); \
vsave_msr1 (10); \
vsave_msr1 (11); \
vsave_msr1 (12); \
vsave_msr1 (13); \
vsave_msr1 (14); \
vsave_msr1 (15); \
vsave_msr1 (16); \
vsave_msr1 (17); \
vsave_msr1 (18); \
vsave_msr1 (19); \
vsave_msr1 (20); \
vsave_msr1 (21); \
vsave_msr1 (22); \
vsave_msr1 (23); \
vsave_msr1 (24); \
vsave_msr1 (25); \
vsave_msr1 (26); \
vsave_msr1 (27); \
vsave_msr1 (28); \
vsave_msr1 (29); \
vsave_msr1 (30); \
vsave_msr1 (31); \
vsave_msr2 (33, 32*16+12); \
vsave (32, 33*16)
#else
#define EH_FRAME_VMX
#endif
.section .eh_frame,"a",@progbits
.Lcie:
.long .Lcie_end - .Lcie_start
.Lcie_start:
.long 0 /* CIE ID */
.byte 1 /* Version number */
[PATCH] Mark unwind info for signal trampolines in vDSOs Mark unwind info for signal trampolines using the new S augmentation flag introduced in: http://gcc.gnu.org/PR26208. GCC 4.2 (or patched earlier GCC) will be able to special case unwinding through frames right above signal trampolines. As the augmentations start with z flag and S is at the very end of the augmentation string, older GCCs will just skip the S flag as unknown (that's why an augmentation flag was chosen over say a new CFA opcode). Signed-off-by: Jakub Jelinek <jakub@redhat.com> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-31 10:30:28 +00:00
.string "zRS" /* NUL-terminated augmentation string */
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
.uleb128 4 /* Code alignment factor */
.sleb128 -8 /* Data alignment factor */
.byte 67 /* Return address register column, ap */
.uleb128 1 /* Augmentation value length */
.byte 0x14 /* DW_EH_PE_pcrel | DW_EH_PE_udata8. */
.byte 0x0c,1,0 /* DW_CFA_def_cfa: r1 ofs 0 */
.balign 8
.Lcie_end:
.long .Lfde0_end - .Lfde0_start
.Lfde0_start:
.long .Lfde0_start - .Lcie /* CIE pointer. */
.quad .Lsigrt_start - . /* PC start, length */
.quad .Lsigrt_end - .Lsigrt_start
.uleb128 0 /* Augmentation */
EH_FRAME_GEN
EH_FRAME_FP
EH_FRAME_VMX
# Do we really need to describe the frame at this point? ie. will
# we ever have some call chain that returns somewhere past the addi?
# I don't think so, since gcc doesn't support async signals.
# .byte 0x41 /* DW_CFA_advance_loc 1*4 */
#undef PTREGS
#define PTREGS 168+56
# EH_FRAME_GEN
# EH_FRAME_FP
# EH_FRAME_VMX
.balign 8
.Lfde0_end:
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