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/* DWARF2 EH unwinding support for PA HP-UX.
Copyright (C) 2005-2022 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 3, or (at your option)
any later version.
GCC 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 General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
/* Don't use this if inhibit_libc is set.
The build for this target will fail trying to include missing headers. */
#ifndef inhibit_libc
#include <signal.h>
#include <sys/ucontext.h>
#include <unistd.h>
/* FIXME: We currently ignore the high halves of general, space and
control registers on PA 2.0 machines for applications using the
32-bit runtime. We don't restore space registers or the floating
point status registers. */
#define MD_FALLBACK_FRAME_STATE_FOR pa_fallback_frame_state
/* HP-UX 10.X doesn't define GetSSReg. */
#ifndef GetSSReg
#define GetSSReg(ssp, ss_reg) \
((UseWideRegs (ssp)) \
? (ssp)->ss_wide.ss_32.ss_reg ## _lo \
: (ssp)->ss_narrow.ss_reg)
#endif
#if TARGET_64BIT
#define GetSSRegAddr(ssp, ss_reg) ((long) &((ssp)->ss_wide.ss_64.ss_reg))
#else
#define GetSSRegAddr(ssp, ss_reg) \
((UseWideRegs (ssp)) \
? (long) &((ssp)->ss_wide.ss_32.ss_reg ## _lo) \
: (long) &((ssp)->ss_narrow.ss_reg))
#endif
#define UPDATE_FS_FOR_SAR(FS, N) \
(FS)->regs.reg[N].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_cr11) - new_cfa
#define UPDATE_FS_FOR_GR(FS, GRN, N) \
(FS)->regs.reg[N].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_gr##GRN) - new_cfa
#define UPDATE_FS_FOR_FR(FS, FRN, N) \
(FS)->regs.reg[N].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[N].loc.offset = (long) &(mc->ss_fr##FRN) - new_cfa;
#define UPDATE_FS_FOR_PC(FS, N) \
(FS)->regs.reg[N].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_pcoq_head) - new_cfa
/* Extract bit field from word using HP's numbering (MSB = 0). */
#define GET_FIELD(X, FROM, TO) \
((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
static inline int
sign_extend (int x, int len)
{
int signbit = (1 << (len - 1));
int mask = (signbit << 1) - 1;
return ((x & mask) ^ signbit) - signbit;
}
/* Extract a 17-bit signed constant from branch instructions. */
static inline int
extract_17 (unsigned word)
{
return sign_extend (GET_FIELD (word, 19, 28)
| GET_FIELD (word, 29, 29) << 10
| GET_FIELD (word, 11, 15) << 11
| (word & 0x1) << 16, 17);
}
/* Extract a 22-bit signed constant from branch instructions. */
static inline int
extract_22 (unsigned word)
{
return sign_extend (GET_FIELD (word, 19, 28)
| GET_FIELD (word, 29, 29) << 10
| GET_FIELD (word, 11, 15) << 11
| GET_FIELD (word, 6, 10) << 16
| (word & 0x1) << 21, 22);
}
static _Unwind_Reason_Code
pa_fallback_frame_state (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
static long cpu;
unsigned int *pc = (unsigned int *) context->ra;
if (pc == 0)
return _URC_END_OF_STACK;
/* Check for relocation of the return value. */
if (!TARGET_64BIT
&& *(pc + 0) == 0x2fd01224 /* fstd,ma fr4,8(sp) */
&& *(pc + 1) == 0x0fd9109d /* ldw -4(sp),ret1 */
&& *(pc + 2) == 0x0fd130bc) /* ldw,mb -8(sp),ret0 */
pc += 3;
else if (!TARGET_64BIT
&& *(pc + 0) == 0x27d01224 /* fstw,ma fr4,8(sp) */
&& *(pc + 1) == 0x0fd130bc) /* ldw,mb -8(sp),ret0 */
pc += 2;
else if (!TARGET_64BIT
&& *(pc + 0) == 0x0fdc12b0 /* stw,ma ret0,8(sp) */
&& *(pc + 1) == 0x0fdd1299 /* stw ret1,-4(sp) */
&& *(pc + 2) == 0x2fd13024) /* fldd,mb -8(sp),fr4 */
pc += 3;
else if (!TARGET_64BIT
&& *(pc + 0) == 0x0fdc12b0 /* stw,ma ret0,8(sp) */
&& *(pc + 1) == 0x27d13024) /* fldw,mb -8(sp),fr4 */
pc += 2;
/* Check if the return address points to an export stub (PA 1.1 or 2.0). */
if ((!TARGET_64BIT
&& *(pc + 0) == 0x4bc23fd1 /* ldw -18(sp),rp */
&& *(pc + 1) == 0x004010a1 /* ldsid (rp),r1 */
&& *(pc + 2) == 0x00011820 /* mtsp r1,sr0 */
&& *(pc + 3) == 0xe0400002) /* be,n 0(sr0,rp) */
||
(!TARGET_64BIT
&& *(pc + 0) == 0x4bc23fd1 /* ldw -18(sp),rp */
&& *(pc + 1) == 0xe840d002)) /* bve,n (rp) */
{
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 30;
fs->regs.cfa_offset = 0;
fs->retaddr_column = 0;
fs->regs.reg[0].how = REG_SAVED_OFFSET;
fs->regs.reg[0].loc.offset = -24;
/* Update context to describe the stub frame. */
uw_update_context (context, fs);
/* Set up fs to describe the FDE for the caller of this stub. */
return uw_frame_state_for (context, fs);
}
/* Check if the return address points to a relocation stub. */
else if (!TARGET_64BIT
&& *(pc + 0) == 0x0fd11082 /* ldw -8(sp),rp */
&& (*(pc + 1) == 0xe840c002 /* bv,n r0(rp) */
|| *(pc + 1) == 0xe840d002)) /* bve,n (rp) */
{
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 30;
fs->regs.cfa_offset = 0;
fs->retaddr_column = 0;
fs->regs.reg[0].how = REG_SAVED_OFFSET;
fs->regs.reg[0].loc.offset = -8;
/* Update context to describe the stub frame. */
uw_update_context (context, fs);
/* Set up fs to describe the FDE for the caller of this stub. */
return uw_frame_state_for (context, fs);
}
/* Check if the return address is an export stub as signal handlers
may return via an export stub. */
if (!TARGET_64BIT
&& (*pc & 0xffe0e002) == 0xe8400000 /* bl x,r2 */
&& *(pc + 1) == 0x08000240 /* nop */
&& *(pc + 2) == 0x4bc23fd1 /* ldw -18(sp),rp */
&& *(pc + 3) == 0x004010a1 /* ldsid (rp),r1 */
&& *(pc + 4) == 0x00011820 /* mtsp r1,sr0 */
&& *(pc + 5) == 0xe0400002) /* be,n 0(sr0,rp) */
/* Extract target address from PA 1.x 17-bit branch. */
pc += extract_17 (*pc) + 2;
else if (!TARGET_64BIT
&& (*pc & 0xfc00e002) == 0xe800a000 /* b,l x,r2 */
&& *(pc + 1) == 0x08000240 /* nop */
&& *(pc + 2) == 0x4bc23fd1 /* ldw -18(sp),rp */
&& *(pc + 3) == 0xe840d002) /* bve,n (rp) */
/* Extract target address from PA 2.0 22-bit branch. */
pc += extract_22 (*pc) + 2;
/* Now check if the return address is one of the signal handler
returns, _sigreturn or _sigsetreturn. */
if ((TARGET_64BIT
&& *(pc + 0) == 0x53db3f51 /* ldd -58(sp),dp */
&& *(pc + 8) == 0x34160116 /* ldi 8b,r22 */
&& *(pc + 9) == 0x08360ac1 /* shladd,l r22,3,r1,r1 */
&& *(pc + 10) == 0x0c2010c1 /* ldd 0(r1),r1 */
&& *(pc + 11) == 0xe4202000) /* be,l 0(sr4,r1) */
||
(TARGET_64BIT
&& *(pc + 0) == 0x36dc0000 /* ldo 0(r22),ret0 */
&& *(pc + 6) == 0x341601c0 /* ldi e0,r22 */
&& *(pc + 7) == 0x08360ac1 /* shladd,l r22,3,r1,r1 */
&& *(pc + 8) == 0x0c2010c1 /* ldd 0(r1),r1 */
&& *(pc + 9) == 0xe4202000) /* be,l 0(sr4,r1) */
||
(!TARGET_64BIT
&& *(pc + 0) == 0x379a0000 /* ldo 0(ret0),r26 */
&& *(pc + 1) == 0x6bd33fc9 /* stw r19,-1c(sp) */
&& *(pc + 2) == 0x20200801 /* ldil L%-40000000,r1 */
&& *(pc + 3) == 0xe420e008 /* be,l 4(sr7,r1) */
&& *(pc + 4) == 0x34160116) /* ldi 8b,r22 */
||
(!TARGET_64BIT
&& *(pc + 0) == 0x6bd33fc9 /* stw r19,-1c(sp) */
&& *(pc + 1) == 0x20200801 /* ldil L%-40000000,r1 */
&& *(pc + 2) == 0xe420e008 /* be,l 4(sr7,r1) */
&& *(pc + 3) == 0x341601c0)) /* ldi e0,r22 */
{
/* The previous stack pointer is saved at (long *)SP - 1. The
ucontext structure is offset from the start of the previous
frame by the siglocal_misc structure. */
struct siglocalx *sl = (struct siglocalx *)
(*((long *) context->cfa - 1));
mcontext_t *mc = &(sl->sl_uc.uc_mcontext);
long new_cfa = GetSSReg (mc, ss_sp);
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 30;
fs->regs.cfa_offset = new_cfa - (long) context->cfa;
UPDATE_FS_FOR_GR (fs, 1, 1);
UPDATE_FS_FOR_GR (fs, 2, 2);
UPDATE_FS_FOR_GR (fs, 3, 3);
UPDATE_FS_FOR_GR (fs, 4, 4);
UPDATE_FS_FOR_GR (fs, 5, 5);
UPDATE_FS_FOR_GR (fs, 6, 6);
UPDATE_FS_FOR_GR (fs, 7, 7);
UPDATE_FS_FOR_GR (fs, 8, 8);
UPDATE_FS_FOR_GR (fs, 9, 9);
UPDATE_FS_FOR_GR (fs, 10, 10);
UPDATE_FS_FOR_GR (fs, 11, 11);
UPDATE_FS_FOR_GR (fs, 12, 12);
UPDATE_FS_FOR_GR (fs, 13, 13);
UPDATE_FS_FOR_GR (fs, 14, 14);
UPDATE_FS_FOR_GR (fs, 15, 15);
UPDATE_FS_FOR_GR (fs, 16, 16);
UPDATE_FS_FOR_GR (fs, 17, 17);
UPDATE_FS_FOR_GR (fs, 18, 18);
UPDATE_FS_FOR_GR (fs, 19, 19);
UPDATE_FS_FOR_GR (fs, 20, 20);
UPDATE_FS_FOR_GR (fs, 21, 21);
UPDATE_FS_FOR_GR (fs, 22, 22);
UPDATE_FS_FOR_GR (fs, 23, 23);
UPDATE_FS_FOR_GR (fs, 24, 24);
UPDATE_FS_FOR_GR (fs, 25, 25);
UPDATE_FS_FOR_GR (fs, 26, 26);
UPDATE_FS_FOR_GR (fs, 27, 27);
UPDATE_FS_FOR_GR (fs, 28, 28);
UPDATE_FS_FOR_GR (fs, 29, 29);
UPDATE_FS_FOR_GR (fs, 30, 30);
UPDATE_FS_FOR_GR (fs, 31, 31);
if (TARGET_64BIT)
{
UPDATE_FS_FOR_FR (fs, 4, 32);
UPDATE_FS_FOR_FR (fs, 5, 33);
UPDATE_FS_FOR_FR (fs, 6, 34);
UPDATE_FS_FOR_FR (fs, 7, 35);
UPDATE_FS_FOR_FR (fs, 8, 36);
UPDATE_FS_FOR_FR (fs, 9, 37);
UPDATE_FS_FOR_FR (fs, 10, 38);
UPDATE_FS_FOR_FR (fs, 11, 39);
UPDATE_FS_FOR_FR (fs, 12, 40);
UPDATE_FS_FOR_FR (fs, 13, 41);
UPDATE_FS_FOR_FR (fs, 14, 42);
UPDATE_FS_FOR_FR (fs, 15, 43);
UPDATE_FS_FOR_FR (fs, 16, 44);
UPDATE_FS_FOR_FR (fs, 17, 45);
UPDATE_FS_FOR_FR (fs, 18, 46);
UPDATE_FS_FOR_FR (fs, 19, 47);
UPDATE_FS_FOR_FR (fs, 20, 48);
UPDATE_FS_FOR_FR (fs, 21, 49);
UPDATE_FS_FOR_FR (fs, 22, 50);
UPDATE_FS_FOR_FR (fs, 23, 51);
UPDATE_FS_FOR_FR (fs, 24, 52);
UPDATE_FS_FOR_FR (fs, 25, 53);
UPDATE_FS_FOR_FR (fs, 26, 54);
UPDATE_FS_FOR_FR (fs, 27, 55);
UPDATE_FS_FOR_FR (fs, 28, 56);
UPDATE_FS_FOR_FR (fs, 29, 57);
UPDATE_FS_FOR_FR (fs, 30, 58);
UPDATE_FS_FOR_FR (fs, 31, 59);
UPDATE_FS_FOR_SAR (fs, 60);
}
else
{
UPDATE_FS_FOR_FR (fs, 4, 32);
UPDATE_FS_FOR_FR (fs, 5, 34);
UPDATE_FS_FOR_FR (fs, 6, 36);
UPDATE_FS_FOR_FR (fs, 7, 38);
UPDATE_FS_FOR_FR (fs, 8, 40);
UPDATE_FS_FOR_FR (fs, 9, 44);
UPDATE_FS_FOR_FR (fs, 10, 44);
UPDATE_FS_FOR_FR (fs, 11, 46);
UPDATE_FS_FOR_FR (fs, 12, 48);
UPDATE_FS_FOR_FR (fs, 13, 50);
UPDATE_FS_FOR_FR (fs, 14, 52);
UPDATE_FS_FOR_FR (fs, 15, 54);
if (!cpu)
cpu = sysconf (_SC_CPU_VERSION);
/* PA-RISC 1.0 only has 16 floating point registers. */
if (cpu != CPU_PA_RISC1_0)
{
UPDATE_FS_FOR_FR (fs, 16, 56);
UPDATE_FS_FOR_FR (fs, 17, 58);
UPDATE_FS_FOR_FR (fs, 18, 60);
UPDATE_FS_FOR_FR (fs, 19, 62);
UPDATE_FS_FOR_FR (fs, 20, 64);
UPDATE_FS_FOR_FR (fs, 21, 66);
UPDATE_FS_FOR_FR (fs, 22, 68);
UPDATE_FS_FOR_FR (fs, 23, 70);
UPDATE_FS_FOR_FR (fs, 24, 72);
UPDATE_FS_FOR_FR (fs, 25, 74);
UPDATE_FS_FOR_FR (fs, 26, 76);
UPDATE_FS_FOR_FR (fs, 27, 78);
UPDATE_FS_FOR_FR (fs, 28, 80);
UPDATE_FS_FOR_FR (fs, 29, 82);
UPDATE_FS_FOR_FR (fs, 30, 84);
UPDATE_FS_FOR_FR (fs, 31, 86);
}
UPDATE_FS_FOR_SAR (fs, 88);
}
fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__;
UPDATE_FS_FOR_PC (fs, __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__);
fs->signal_frame = 1;
return _URC_NO_REASON;
}
return _URC_END_OF_STACK;
}
#endif /* inhibit_libc */