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Differential D112430 Diff 392685 libunwind/src/Unwind-EHABI.cpp

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libunwind/src/Unwind-EHABI.cpp

Show First 20 Lines • Show All 255 Lines • ▼ Show 20 Linesdecode_eht_entry(const uint32_t* data, size_t* off, size_t* len) {
return data; return data;
} }
_LIBUNWIND_EXPORT _Unwind_Reason_Code _LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_VRS_Interpret(_Unwind_Context *context, const uint32_t *data, _Unwind_VRS_Interpret(_Unwind_Context *context, const uint32_t *data,
size_t offset, size_t len) { size_t offset, size_t len) {
bool wrotePC = false; bool wrotePC = false;
bool finish = false; bool finish = false;
bool hasReturnAddrAuthCode = false;
while (offset < len && !finish) { while (offset < len && !finish) {
uint8_t byte = getByte(data, offset++); uint8_t byte = getByte(data, offset++);
if ((byte & 0x80) == 0) { if ((byte & 0x80) == 0) {
uint32_t sp; uint32_t sp;
_Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, &sp); _Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, &sp);
if (byte & 0x40) if (byte & 0x40)
sp -= (((uint32_t)byte & 0x3f) << 2) + 4; sp -= (((uint32_t)byte & 0x3f) << 2) + 4;
else else
Show All 36 Lines if ((byte & 0x80) == 0) {
switch (byte) { switch (byte) {
case 0xb0: case 0xb0:
finish = true; finish = true;
break; break;
case 0xb1: { case 0xb1: {
if (offset >= len) if (offset >= len)
return _URC_FAILURE; return _URC_FAILURE;
uint8_t registers = getByte(data, offset++); uint8_t registers = getByte(data, offset++);
if (registers & 0xf0 || !registers) if (registers & 0xf0 || !registers)
mstorsjoUnsubmitted
Done
ReplyInline Actions

This particular change looks unrelated to the rest, on a quick glance

mstorsjo: This particular change looks unrelated to the rest, on a quick glance
chillUnsubmitted
Done
ReplyInline Actions

Indeed, that change is a leftover from when the encoding of the instruction to pop return address authentication code was <0xb1,0x00>

chill: Indeed, that change is a leftover from when the encoding of the instruction to pop return…
return _URC_FAILURE; return _URC_FAILURE;
_Unwind_VRS_Pop(context, _UVRSC_CORE, registers, _UVRSD_UINT32); _Unwind_VRS_Pop(context, _UVRSC_CORE, registers, _UVRSD_UINT32);
break; break;
} }
case 0xb2: { case 0xb2: {
uint32_t addend = 0; uint32_t addend = 0;
uint32_t shift = 0; uint32_t shift = 0;
// This decodes a uleb128 value. // This decodes a uleb128 value.
Show All 17 Lines if ((byte & 0x80) == 0) {
case 0xb3: { case 0xb3: {
uint8_t v = getByte(data, offset++); uint8_t v = getByte(data, offset++);
_Unwind_VRS_Pop(context, _UVRSC_VFP, _Unwind_VRS_Pop(context, _UVRSC_VFP,
RegisterRange(static_cast<uint8_t>(v >> 4), RegisterRange(static_cast<uint8_t>(v >> 4),
v & 0x0f), _UVRSD_VFPX); v & 0x0f), _UVRSD_VFPX);
break; break;
} }
case 0xb4: case 0xb4:
hasReturnAddrAuthCode = true;
_Unwind_VRS_Pop(context, _UVRSC_PSEUDO,
0 /* Return Address Auth Code */, _UVRSD_UINT32);
break;
case 0xb5: case 0xb5:
case 0xb6: case 0xb6:
case 0xb7: case 0xb7:
return _URC_FAILURE; return _URC_FAILURE;
default: default:
_Unwind_VRS_Pop(context, _UVRSC_VFP, _Unwind_VRS_Pop(context, _UVRSC_VFP,
RegisterRange(8, byte & 0x07), _UVRSD_VFPX); RegisterRange(8, byte & 0x07), _UVRSD_VFPX);
break; break;
▲ Show 20 Lines • Show All 59 Lines • ▼ Show 20 Lines#endif
default: default:
return _URC_FAILURE; return _URC_FAILURE;
} }
} }
} }
if (!wrotePC) { if (!wrotePC) {
uint32_t lr; uint32_t lr;
_Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_LR, _UVRSD_UINT32, &lr); _Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_LR, _UVRSD_UINT32, &lr);
#ifdef __ARM_FEATURE_PAUTH
if (hasReturnAddrAuthCode) {
uint32_t sp;
uint32_t pac;
_Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, &sp);
_Unwind_VRS_Get(context, _UVRSC_PSEUDO, UNW_ARM_RA_AUTH_CODE,
_UVRSD_UINT32, &pac);
__asm__ __volatile__("autg %0, %1, %2" : : "r"(pac), "r"(lr), "r"(sp) :);
}
#endif
_Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_IP, _UVRSD_UINT32, &lr); _Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_IP, _UVRSD_UINT32, &lr);
} }
return _URC_CONTINUE_UNWIND; return _URC_CONTINUE_UNWIND;
} }
extern "C" _LIBUNWIND_EXPORT _Unwind_Reason_Code extern "C" _LIBUNWIND_EXPORT _Unwind_Reason_Code
__aeabi_unwind_cpp_pr0(_Unwind_State state, _Unwind_Control_Block *ucbp, __aeabi_unwind_cpp_pr0(_Unwind_State state, _Unwind_Control_Block *ucbp,
_Unwind_Context *context) { _Unwind_Context *context) {
▲ Show 20 Lines • Show All 503 Lines • ▼ Show 20 Lines case _UVRSC_WMMXD:
*(unw_fpreg_t *)valuep) == UNW_ESUCCESS *(unw_fpreg_t *)valuep) == UNW_ESUCCESS
? _UVRSR_OK ? _UVRSR_OK
: _UVRSR_FAILED; : _UVRSR_FAILED;
#else #else
case _UVRSC_WMMXC: case _UVRSC_WMMXC:
case _UVRSC_WMMXD: case _UVRSC_WMMXD:
break; break;
#endif #endif
case _UVRSC_PSEUDO:
// There's only one pseudo-register, PAC, with regno == 0.
if (representation != _UVRSD_UINT32 || regno != 0)
return _UVRSR_FAILED;
return __unw_set_reg(cursor, (unw_regnum_t)(UNW_ARM_RA_AUTH_CODE),
*(unw_word_t *)valuep) == UNW_ESUCCESS
? _UVRSR_OK
: _UVRSR_FAILED;
break;
} }
_LIBUNWIND_ABORT("unsupported register class"); _LIBUNWIND_ABORT("unsupported register class");
} }
static _Unwind_VRS_Result static _Unwind_VRS_Result
_Unwind_VRS_Get_Internal(_Unwind_Context *context, _Unwind_VRS_Get_Internal(_Unwind_Context *context,
_Unwind_VRS_RegClass regclass, uint32_t regno, _Unwind_VRS_RegClass regclass, uint32_t regno,
_Unwind_VRS_DataRepresentation representation, _Unwind_VRS_DataRepresentation representation,
Show All 38 Lines case _UVRSC_WMMXD:
(unw_fpreg_t *)valuep) == UNW_ESUCCESS (unw_fpreg_t *)valuep) == UNW_ESUCCESS
? _UVRSR_OK ? _UVRSR_OK
: _UVRSR_FAILED; : _UVRSR_FAILED;
#else #else
case _UVRSC_WMMXC: case _UVRSC_WMMXC:
case _UVRSC_WMMXD: case _UVRSC_WMMXD:
break; break;
#endif #endif
case _UVRSC_PSEUDO:
// There's only one pseudo-register, PAC, with regno == 0.
if (representation != _UVRSD_UINT32 || regno != 0)
return _UVRSR_FAILED;
return __unw_get_reg(cursor, (unw_regnum_t)(UNW_ARM_RA_AUTH_CODE),
(unw_word_t *)valuep) == UNW_ESUCCESS
? _UVRSR_OK
: _UVRSR_FAILED;
break;
} }
_LIBUNWIND_ABORT("unsupported register class"); _LIBUNWIND_ABORT("unsupported register class");
} }
_LIBUNWIND_EXPORT _Unwind_VRS_Result _LIBUNWIND_EXPORT _Unwind_VRS_Result
_Unwind_VRS_Get(_Unwind_Context *context, _Unwind_VRS_RegClass regclass, _Unwind_VRS_Get(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
uint32_t regno, _Unwind_VRS_DataRepresentation representation, uint32_t regno, _Unwind_VRS_DataRepresentation representation,
void *valuep) { void *valuep) {
▲ Show 20 Lines • Show All 81 Lines • ▼ Show 20 Lines#endif
_UVRSR_OK) _UVRSR_OK)
return _UVRSR_FAILED; return _UVRSR_FAILED;
} }
if (representation == _UVRSD_VFPX) if (representation == _UVRSD_VFPX)
++sp; ++sp;
return _Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, return _Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32,
&sp); &sp);
} }
case _UVRSC_PSEUDO: {
if (representation != _UVRSD_UINT32 || discriminator != 0)
return _UVRSR_FAILED;
// Return Address Authentication code (PAC) - discriminator 0
uint32_t *sp;
if (_Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32,
&sp) != _UVRSR_OK) {
return _UVRSR_FAILED;
}
uint32_t pac = *sp++;
_Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, &sp);
return _Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_RA_AUTH_CODE,
_UVRSD_UINT32, &pac);
}
} }
_LIBUNWIND_ABORT("unsupported register class"); _LIBUNWIND_ABORT("unsupported register class");
} }
/// Not used by C++. /// Not used by C++.
/// Unwinds stack, calling "stop" function at each frame. /// Unwinds stack, calling "stop" function at each frame.
/// Could be used to implement longjmp(). /// Could be used to implement longjmp().
_LIBUNWIND_EXPORT _Unwind_Reason_Code _LIBUNWIND_EXPORT _Unwind_Reason_Code
▲ Show 20 Lines • Show All 58 Lines • Show Last 20 Lines