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Differential D112430 Diff 392685 libunwind/src/Registers.hpp

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libunwind/src/Registers.hpp

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private: private:
struct GPRs { struct GPRs {
uint32_t __r[13]; // r0-r12 uint32_t __r[13]; // r0-r12
uint32_t __sp; // Stack pointer r13 uint32_t __sp; // Stack pointer r13
uint32_t __lr; // Link register r14 uint32_t __lr; // Link register r14
uint32_t __pc; // Program counter r15 uint32_t __pc; // Program counter r15
}; };
struct PseudoRegisters {
uint32_t __pac; // Return Authentication Code (PAC)
};
static void saveVFPWithFSTMD(void*); static void saveVFPWithFSTMD(void*);
static void saveVFPWithFSTMX(void*); static void saveVFPWithFSTMX(void*);
static void saveVFPv3(void*); static void saveVFPv3(void*);
static void restoreVFPWithFLDMD(void*); static void restoreVFPWithFLDMD(void*);
static void restoreVFPWithFLDMX(void*); static void restoreVFPWithFLDMX(void*);
static void restoreVFPv3(void*); static void restoreVFPv3(void*);
#if defined(__ARM_WMMX) #if defined(__ARM_WMMX)
static void saveiWMMX(void*); static void saveiWMMX(void*);
static void saveiWMMXControl(uint32_t*); static void saveiWMMXControl(uint32_t*);
static void restoreiWMMX(void*); static void restoreiWMMX(void*);
static void restoreiWMMXControl(uint32_t*); static void restoreiWMMXControl(uint32_t*);
#endif #endif
void restoreCoreAndJumpTo(); void restoreCoreAndJumpTo();
// ARM registers // ARM registers
GPRs _registers; GPRs _registers;
PseudoRegisters _pseudo_registers;
// We save floating point registers lazily because we can't know ahead of // We save floating point registers lazily because we can't know ahead of
// time which ones are used. See EHABI #4.7. // time which ones are used. See EHABI #4.7.
// Whether D0-D15 are saved in the FTSMX instead of FSTMD format. // Whether D0-D15 are saved in the FTSMX instead of FSTMD format.
// //
// See EHABI #7.5 that explains how matching instruction sequences for load // See EHABI #7.5 that explains how matching instruction sequences for load
// and store need to be used to correctly restore the exact register bits. // and store need to be used to correctly restore the exact register bits.
Show All 21 Lines
inline Registers_arm::Registers_arm(const void *registers) inline Registers_arm::Registers_arm(const void *registers)
: _use_X_for_vfp_save(false), : _use_X_for_vfp_save(false),
_saved_vfp_d0_d15(false), _saved_vfp_d0_d15(false),
_saved_vfp_d16_d31(false) { _saved_vfp_d16_d31(false) {
static_assert((check_fit<Registers_arm, unw_context_t>::does_fit), static_assert((check_fit<Registers_arm, unw_context_t>::does_fit),
"arm registers do not fit into unw_context_t"); "arm registers do not fit into unw_context_t");
// See __unw_getcontext() note about data. // See __unw_getcontext() note about data.
memcpy(&_registers, registers, sizeof(_registers)); memcpy(&_registers, registers, sizeof(_registers));
memset(&_pseudo_registers, 0, sizeof(_pseudo_registers));
memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad)); memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad));
memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31)); memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31));
#if defined(__ARM_WMMX) #if defined(__ARM_WMMX)
_saved_iwmmx = false; _saved_iwmmx = false;
_saved_iwmmx_control = false; _saved_iwmmx_control = false;
memset(&_iwmmx, 0, sizeof(_iwmmx)); memset(&_iwmmx, 0, sizeof(_iwmmx));
memset(&_iwmmx_control, 0, sizeof(_iwmmx_control)); memset(&_iwmmx_control, 0, sizeof(_iwmmx_control));
#endif #endif
} }
inline Registers_arm::Registers_arm() inline Registers_arm::Registers_arm()
: _use_X_for_vfp_save(false), : _use_X_for_vfp_save(false),
_saved_vfp_d0_d15(false), _saved_vfp_d0_d15(false),
_saved_vfp_d16_d31(false) { _saved_vfp_d16_d31(false) {
memset(&_registers, 0, sizeof(_registers)); memset(&_registers, 0, sizeof(_registers));
memset(&_pseudo_registers, 0, sizeof(_pseudo_registers));
memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad)); memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad));
memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31)); memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31));
#if defined(__ARM_WMMX) #if defined(__ARM_WMMX)
_saved_iwmmx = false; _saved_iwmmx = false;
_saved_iwmmx_control = false; _saved_iwmmx_control = false;
memset(&_iwmmx, 0, sizeof(_iwmmx)); memset(&_iwmmx, 0, sizeof(_iwmmx));
memset(&_iwmmx_control, 0, sizeof(_iwmmx_control)); memset(&_iwmmx_control, 0, sizeof(_iwmmx_control));
#endif #endif
Show All 11 Linesinline bool Registers_arm::validRegister(int regNum) const {
if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15) if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15)
return true; return true;
#if defined(__ARM_WMMX) #if defined(__ARM_WMMX)
if (regNum >= UNW_ARM_WC0 && regNum <= UNW_ARM_WC3) if (regNum >= UNW_ARM_WC0 && regNum <= UNW_ARM_WC3)
return true; return true;
#endif #endif
#ifdef __ARM_FEATURE_PAUTH
if (regNum == UNW_ARM_RA_AUTH_CODE)
danielkissUnsubmitted
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#endif
+ #ifdef __ARM_FEATURE_PAUTH
if (regNum == UNW_ARM_RA_AUTH_CODE)
return true;
-
+ #endif
return false;

Maybe we could gate this on __ARM_FEATURE_PAUTH because it won't work anyway without the feature enabled for libunwind.

danielkiss: Maybe we could gate this on __ARM_FEATURE_PAUTH because it won't work anyway without the…
return true;
#endif
return false; return false;
} }
inline uint32_t Registers_arm::getRegister(int regNum) const { inline uint32_t Registers_arm::getRegister(int regNum) const {
if (regNum == UNW_REG_SP || regNum == UNW_ARM_SP) if (regNum == UNW_REG_SP || regNum == UNW_ARM_SP)
return _registers.__sp; return _registers.__sp;
if (regNum == UNW_ARM_LR) if (regNum == UNW_ARM_LR)
Show All 10 Lines if (regNum >= UNW_ARM_WC0 && regNum <= UNW_ARM_WC3) {
if (!_saved_iwmmx_control) { if (!_saved_iwmmx_control) {
_saved_iwmmx_control = true; _saved_iwmmx_control = true;
saveiWMMXControl(_iwmmx_control); saveiWMMXControl(_iwmmx_control);
} }
return _iwmmx_control[regNum - UNW_ARM_WC0]; return _iwmmx_control[regNum - UNW_ARM_WC0];
} }
#endif #endif
#ifdef __ARM_FEATURE_PAUTH
if (regNum == UNW_ARM_RA_AUTH_CODE)
danielkissUnsubmitted
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ditto, maybe better to run into a _LIBUNWIND_ABORT instead debugging a silently skipping the authentication.

danielkiss: ditto, maybe better to run into a `_LIBUNWIND_ABORT` instead debugging a silently skipping the…
return _pseudo_registers.__pac;
#endif
_LIBUNWIND_ABORT("unsupported arm register"); _LIBUNWIND_ABORT("unsupported arm register");
} }
inline void Registers_arm::setRegister(int regNum, uint32_t value) { inline void Registers_arm::setRegister(int regNum, uint32_t value) {
if (regNum == UNW_REG_SP || regNum == UNW_ARM_SP) { if (regNum == UNW_REG_SP || regNum == UNW_ARM_SP) {
_registers.__sp = value; _registers.__sp = value;
return; return;
} }
Show All 19 Lines if (!_saved_iwmmx_control) {
_saved_iwmmx_control = true; _saved_iwmmx_control = true;
saveiWMMXControl(_iwmmx_control); saveiWMMXControl(_iwmmx_control);
} }
_iwmmx_control[regNum - UNW_ARM_WC0] = value; _iwmmx_control[regNum - UNW_ARM_WC0] = value;
return; return;
} }
#endif #endif
if (regNum == UNW_ARM_RA_AUTH_CODE) {
_pseudo_registers.__pac = value;
return;
}
_LIBUNWIND_ABORT("unsupported arm register"); _LIBUNWIND_ABORT("unsupported arm register");
} }
inline const char *Registers_arm::getRegisterName(int regNum) { inline const char *Registers_arm::getRegisterName(int regNum) {
switch (regNum) { switch (regNum) {
case UNW_REG_IP: case UNW_REG_IP:
case UNW_ARM_IP: // UNW_ARM_R15 is alias case UNW_ARM_IP: // UNW_ARM_R15 is alias
return "pc"; return "pc";
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