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Only use blx if available

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Introduce ARM version for the target architecture in order to determine
if blx instruction can be used or not. Availability of blx instruction
allows for more scenarii supported in R_ARM_CALL relocation. It should
also be useful when introducing support for the R_ARM_THM_CALL
relocation.
This commit is contained in:
Thomas Preud'homme 2012-10-16 00:31:56 +02:00
parent c6630ef92a
commit 9966fd4eae
2 changed files with 19 additions and 8 deletions
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8
tcc.h
View File

@ -105,6 +105,14 @@
#define TCC_TARGET_I386
#endif
#if defined (TCC_TARGET_ARM) && !defined(TCC_ARM_VERSION)
#ifdef TCC_ARM_HARDFLOAT
#define TCC_ARM_VERSION 7
#else
#define TCC_ARM_VERSION 4
#endif
#endif
#if !defined(TCC_UCLIBC) && !defined(TCC_TARGET_ARM) && \
!defined(TCC_TARGET_C67) && !defined(TCC_TARGET_X86_64)
#define CONFIG_TCC_BCHECK /* enable bound checking code */

19
tccelf.c
View File

@ -601,27 +601,30 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
case R_ARM_JUMP24:
case R_ARM_PLT32:
{
int x, is_thumb, is_call, h;
int x, is_thumb, is_call, h, blx_avail;
x = (*(int *)ptr)&0xffffff;
(*(int *)ptr) &= 0xff000000;
if (x & 0x800000)
x -= 0x1000000;
x <<= 2;
blx_avail = (TCC_ARM_VERSION >= 5);
is_thumb = val & 1;
is_call = (type == R_ARM_CALL);
x += (val & -2) - addr;
x += val - addr;
h = x & 2;
#ifndef TCC_TARGET_PE
if((x & 3) != 0 || x >= 0x4000000 || x < -0x4000000)
if (s1->output_type == TCC_OUTPUT_MEMORY)
x += add_jmp_table(s1, val) - val; /* add veneer */
if ((x & 3) || x >= 0x4000000 || x < -0x4000000)
if (!(x & 3) || !blx_avail || !is_call)
if (s1->output_type == TCC_OUTPUT_MEMORY)
x += add_jmp_table(s1, val) - val; /* add veneer */
#endif
if((x & 3) != 0 || x >= 0x4000000 || x < -0x4000000)
if (!(h && is_call && is_thumb))
if ((x & 3) || x >= 0x4000000 || x < -0x4000000)
if (!(x & 3) || !blx_avail || !is_call)
tcc_error("can't relocate value at %x",addr);
x >>= 2;
x &= 0xffffff;
if (is_call && is_thumb) {
/* Only reached if blx is avail and it is a call */
if (is_thumb) {
x |= h << 24;
(*(int *)ptr) = 0xfa << 24; /* bl -> blx */
}