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[LLDB][MIPS] Handle PIC calling convention for MIPS32

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SUMMARY:
    - PrepareTrivialCall() to setup register r25 with the address of function to be called.
    - RegisterIsCalleeSaved() to use name of a register instead of its byte_offset.
    
    Reviewers: clayborg
    Subscribers: mohit.bhakkad, sagar, jaydeep, lldb-commits
    Differential Revision: http://reviews.llvm.org/D15273

llvm-svn: 255005
This commit is contained in:
Bhushan D. Attarde
2015-12-08 06:05:57 +00:00
parent bd44cd9d55
commit 56222509c3
1 changed files with 37 additions and 6 deletions
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43
lldb/source/Plugins/ABI/SysV-mips/ABISysV_mips.cpp
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@@ -241,6 +241,7 @@ ABISysV_mips::PrepareTrivialCall (Thread &thread,
const RegisterInfo *pc_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
const RegisterInfo *sp_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
const RegisterInfo *ra_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
const RegisterInfo *r25_info = reg_ctx->GetRegisterInfoByName("r25", 0);
if (log)
log->Printf("Writing SP: 0x%" PRIx64, (uint64_t)sp);
@@ -262,7 +263,14 @@ ABISysV_mips::PrepareTrivialCall (Thread &thread,
// Set pc to the address of the called function.
if (!reg_ctx->WriteRegisterFromUnsigned (pc_reg_info, func_addr))
return false;
if (log)
log->Printf("Writing r25: 0x%" PRIx64, (uint64_t)func_addr);
// All callers of position independent functions must place the address of the called function in t9 (r25)
if (!reg_ctx->WriteRegisterFromUnsigned (r25_info, func_addr))
return false;
return true;
}
@@ -546,13 +554,36 @@ ABISysV_mips::RegisterIsCalleeSaved (const RegisterInfo *reg_info)
{
// Preserved registers are :
// r16-r23, r28, r29, r30, r31
const char *name = reg_info->name;
int reg = ((reg_info->byte_offset) / 4);
if (name[0] == 'r')
{
switch (name[1])
{
case '1':
if (name[2] == '6' || name[2] == '7' || name[2] == '8' || name[2] == '9') // r16-r19
return name[3] == '\0';
break;
case '2':
if (name[2] == '0' || name[2] == '1' || name[2] == '2' || name[2] == '3' // r20-r23
|| name[2] == '8' || name[2] == '9') // r28 and r29
return name[3] == '\0';
break;
case '3':
if (name[2] == '0' || name[2] == '1') // r30 and r31
return name[3] == '\0';
break;
}
bool save = (reg >= 16) && (reg <= 23);
save |= (reg >= 28) && (reg <= 31);
return save;
if (name[0] == 'g' && name[1] == 'p' && name[2] == '\0') // gp (r28)
return true;
if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp (r29)
return true;
if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp (r30)
return true;
if (name[0] == 'r' && name[1] == 'a' && name[2] == '\0') // ra (r31)
return true;
}
}
return false;
}