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[lldb] [Process/Linux] Support arbitrarily-sized FPR writes on ARM 

Support arbitrarily-sized FPR writes on ARM in order to fix writing qN
registers directly.  Currently, writing them works only by accident
due to value_regs splitting them into smaller writes via dN and sN
registers.

Differential Revision: https://reviews.llvm.org/D112131
This commit is contained in:
Michał Górny 2021-10-20 13:35:35 +02:00
parent be6c8dc765
commit 192331b890
1 changed files with 2 additions and 20 deletions
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22
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm.cpp
View File

@ -182,27 +182,9 @@ NativeRegisterContextLinux_arm::WriteRegister(const RegisterInfo *reg_info,
uint32_t fpr_offset = CalculateFprOffset(reg_info);
assert(fpr_offset < sizeof m_fpr);
uint8_t *dst = (uint8_t *)&m_fpr + fpr_offset;
switch (reg_info->byte_size) {
case 2:
*(uint16_t *)dst = reg_value.GetAsUInt16();
break;
case 4:
*(uint32_t *)dst = reg_value.GetAsUInt32();
break;
case 8:
*(uint64_t *)dst = reg_value.GetAsUInt64();
break;
default:
assert(false && "Unhandled data size.");
return Status("unhandled register data size %" PRIu32,
reg_info->byte_size);
}
::memcpy(dst, reg_value.GetBytes(), reg_info->byte_size);
Status error = WriteFPR();
if (error.Fail())
return error;
return Status();
return WriteFPR();
}
return Status("failed - register wasn't recognized to be a GPR or an FPR, "