diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/kernel/reloc_32.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/kernel/reloc_32.S | 208 |
1 files changed, 0 insertions, 208 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/kernel/reloc_32.S b/ANDROID_3.4.5/arch/powerpc/kernel/reloc_32.S deleted file mode 100644 index ef46ba6e..00000000 --- a/ANDROID_3.4.5/arch/powerpc/kernel/reloc_32.S +++ /dev/null @@ -1,208 +0,0 @@ -/* - * Code to process dynamic relocations for PPC32. - * - * Copyrights (C) IBM Corporation, 2011. - * Author: Suzuki Poulose <suzuki@in.ibm.com> - * - * - Based on ppc64 code - reloc_64.S - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <asm/ppc_asm.h> - -/* Dynamic section table entry tags */ -DT_RELA = 7 /* Tag for Elf32_Rela section */ -DT_RELASZ = 8 /* Size of the Rela relocs */ -DT_RELAENT = 9 /* Size of one Rela reloc entry */ - -STN_UNDEF = 0 /* Undefined symbol index */ -STB_LOCAL = 0 /* Local binding for the symbol */ - -R_PPC_ADDR16_LO = 4 /* Lower half of (S+A) */ -R_PPC_ADDR16_HI = 5 /* Upper half of (S+A) */ -R_PPC_ADDR16_HA = 6 /* High Adjusted (S+A) */ -R_PPC_RELATIVE = 22 - -/* - * r3 = desired final address - */ - -_GLOBAL(relocate) - - mflr r0 /* Save our LR */ - bl 0f /* Find our current runtime address */ -0: mflr r12 /* Make it accessible */ - mtlr r0 - - lwz r11, (p_dyn - 0b)(r12) - add r11, r11, r12 /* runtime address of .dynamic section */ - lwz r9, (p_rela - 0b)(r12) - add r9, r9, r12 /* runtime address of .rela.dyn section */ - lwz r10, (p_st - 0b)(r12) - add r10, r10, r12 /* runtime address of _stext section */ - lwz r13, (p_sym - 0b)(r12) - add r13, r13, r12 /* runtime address of .dynsym section */ - - /* - * Scan the dynamic section for RELA, RELASZ entries - */ - li r6, 0 - li r7, 0 - li r8, 0 -1: lwz r5, 0(r11) /* ELF_Dyn.d_tag */ - cmpwi r5, 0 /* End of ELF_Dyn[] */ - beq eodyn - cmpwi r5, DT_RELA - bne relasz - lwz r7, 4(r11) /* r7 = rela.link */ - b skip -relasz: - cmpwi r5, DT_RELASZ - bne relaent - lwz r8, 4(r11) /* r8 = Total Rela relocs size */ - b skip -relaent: - cmpwi r5, DT_RELAENT - bne skip - lwz r6, 4(r11) /* r6 = Size of one Rela reloc */ -skip: - addi r11, r11, 8 - b 1b -eodyn: /* End of Dyn Table scan */ - - /* Check if we have found all the entries */ - cmpwi r7, 0 - beq done - cmpwi r8, 0 - beq done - cmpwi r6, 0 - beq done - - - /* - * Work out the current offset from the link time address of .rela - * section. - * cur_offset[r7] = rela.run[r9] - rela.link [r7] - * _stext.link[r12] = _stext.run[r10] - cur_offset[r7] - * final_offset[r3] = _stext.final[r3] - _stext.link[r12] - */ - subf r7, r7, r9 /* cur_offset */ - subf r12, r7, r10 - subf r3, r12, r3 /* final_offset */ - - subf r8, r6, r8 /* relaz -= relaent */ - /* - * Scan through the .rela table and process each entry - * r9 - points to the current .rela table entry - * r13 - points to the symbol table - */ - - /* - * Check if we have a relocation based on symbol - * r5 will hold the value of the symbol. - */ -applyrela: - lwz r4, 4(r9) /* r4 = rela.r_info */ - srwi r5, r4, 8 /* ELF32_R_SYM(r_info) */ - cmpwi r5, STN_UNDEF /* sym == STN_UNDEF ? */ - beq get_type /* value = 0 */ - /* Find the value of the symbol at index(r5) */ - slwi r5, r5, 4 /* r5 = r5 * sizeof(Elf32_Sym) */ - add r12, r13, r5 /* r12 = &__dyn_sym[Index] */ - - /* - * GNU ld has a bug, where dynamic relocs based on - * STB_LOCAL symbols, the value should be assumed - * to be zero. - Alan Modra - */ - /* XXX: Do we need to check if we are using GNU ld ? */ - lbz r5, 12(r12) /* r5 = dyn_sym[Index].st_info */ - extrwi r5, r5, 4, 24 /* r5 = ELF32_ST_BIND(r5) */ - cmpwi r5, STB_LOCAL /* st_value = 0, ld bug */ - beq get_type /* We have r5 = 0 */ - lwz r5, 4(r12) /* r5 = __dyn_sym[Index].st_value */ - -get_type: - /* Load the relocation type to r4 */ - extrwi r4, r4, 8, 24 /* r4 = ELF32_R_TYPE(r_info) = ((char*)r4)[3] */ - - /* R_PPC_RELATIVE */ - cmpwi r4, R_PPC_RELATIVE - bne hi16 - lwz r4, 0(r9) /* r_offset */ - lwz r0, 8(r9) /* r_addend */ - add r0, r0, r3 /* final addend */ - stwx r0, r4, r7 /* memory[r4+r7]) = (u32)r0 */ - b nxtrela /* continue */ - - /* R_PPC_ADDR16_HI */ -hi16: - cmpwi r4, R_PPC_ADDR16_HI - bne ha16 - lwz r4, 0(r9) /* r_offset */ - lwz r0, 8(r9) /* r_addend */ - add r0, r0, r3 - add r0, r0, r5 /* r0 = (S+A+Offset) */ - extrwi r0, r0, 16, 0 /* r0 = (r0 >> 16) */ - b store_half - - /* R_PPC_ADDR16_HA */ -ha16: - cmpwi r4, R_PPC_ADDR16_HA - bne lo16 - lwz r4, 0(r9) /* r_offset */ - lwz r0, 8(r9) /* r_addend */ - add r0, r0, r3 - add r0, r0, r5 /* r0 = (S+A+Offset) */ - extrwi r5, r0, 1, 16 /* Extract bit 16 */ - extrwi r0, r0, 16, 0 /* r0 = (r0 >> 16) */ - add r0, r0, r5 /* Add it to r0 */ - b store_half - - /* R_PPC_ADDR16_LO */ -lo16: - cmpwi r4, R_PPC_ADDR16_LO - bne nxtrela - lwz r4, 0(r9) /* r_offset */ - lwz r0, 8(r9) /* r_addend */ - add r0, r0, r3 - add r0, r0, r5 /* r0 = (S+A+Offset) */ - extrwi r0, r0, 16, 16 /* r0 &= 0xffff */ - /* Fall through to */ - - /* Store half word */ -store_half: - sthx r0, r4, r7 /* memory[r4+r7] = (u16)r0 */ - -nxtrela: - /* - * We have to flush the modified instructions to the - * main storage from the d-cache. And also, invalidate the - * cached instructions in i-cache which has been modified. - * - * We delay the sync / isync operation till the end, since - * we won't be executing the modified instructions until - * we return from here. - */ - dcbst r4,r7 - sync /* Ensure the data is flushed before icbi */ - icbi r4,r7 - cmpwi r8, 0 /* relasz = 0 ? */ - ble done - add r9, r9, r6 /* move to next entry in the .rela table */ - subf r8, r6, r8 /* relasz -= relaent */ - b applyrela - -done: - sync /* Wait for the flush to finish */ - isync /* Discard prefetched instructions */ - blr - -p_dyn: .long __dynamic_start - 0b -p_rela: .long __rela_dyn_start - 0b -p_sym: .long __dynamic_symtab - 0b -p_st: .long _stext - 0b |