diff options
Diffstat (limited to 'drivers/staging/tidspbridge/dynload/tramp.c')
| -rw-r--r-- | drivers/staging/tidspbridge/dynload/tramp.c | 1143 |
1 files changed, 1143 insertions, 0 deletions
diff --git a/drivers/staging/tidspbridge/dynload/tramp.c b/drivers/staging/tidspbridge/dynload/tramp.c new file mode 100644 index 000000000000..60d22ea47055 --- /dev/null +++ b/drivers/staging/tidspbridge/dynload/tramp.c @@ -0,0 +1,1143 @@ +/* + * tramp.c + * + * DSP-BIOS Bridge driver support functions for TI OMAP processors. + * + * Copyright (C) 2009 Texas Instruments, Inc. + * + * This package is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#include "header.h" + +#if TMS32060 +#include "tramp_table_c6000.c" +#endif + +#define MAX_RELOS_PER_PASS 4 + +/* + * Function: priv_tramp_sect_tgt_alloc + * Description: Allocate target memory for the trampoline section. The + * target mem size is easily obtained as the next available address. + */ +static int priv_tramp_sect_tgt_alloc(struct dload_state *dlthis) +{ + int ret_val = 0; + struct ldr_section_info *sect_info; + + /* Populate the trampoline loader section and allocate it on the + * target. The section name is ALWAYS the first string in the final + * string table for trampolines. The trampoline section is always + * 1 beyond the total number of allocated sections. */ + sect_info = &dlthis->ldr_sections[dlthis->allocated_secn_count]; + + sect_info->name = dlthis->tramp.final_string_table; + sect_info->size = dlthis->tramp.tramp_sect_next_addr; + sect_info->context = 0; + sect_info->type = + (4 << 8) | DLOAD_TEXT | DS_ALLOCATE_MASK | DS_DOWNLOAD_MASK; + sect_info->page = 0; + sect_info->run_addr = 0; + sect_info->load_addr = 0; + ret_val = dlthis->myalloc->dload_allocate(dlthis->myalloc, + sect_info, + ds_alignment + (sect_info->type)); + + if (ret_val == 0) + dload_error(dlthis, "Failed to allocate target memory for" + " trampoline"); + + return ret_val; +} + +/* + * Function: priv_h2a + * Description: Helper function to convert a hex value to its ASCII + * representation. Used for trampoline symbol name generation. + */ +static u8 priv_h2a(u8 value) +{ + if (value > 0xF) + return 0xFF; + + if (value <= 9) + value += 0x30; + else + value += 0x37; + + return value; +} + +/* + * Function: priv_tramp_sym_gen_name + * Description: Generate a trampoline symbol name (ASCII) using the value + * of the symbol. This places the new name into the user buffer. + * The name is fixed in length and of the form: __$dbTR__xxxxxxxx + * (where "xxxxxxxx" is the hex value. + */ +static void priv_tramp_sym_gen_name(u32 value, char *dst) +{ + u32 i; + char *prefix = TRAMP_SYM_PREFIX; + char *dst_local = dst; + u8 tmp; + + /* Clear out the destination, including the ending NULL */ + for (i = 0; i < (TRAMP_SYM_PREFIX_LEN + TRAMP_SYM_HEX_ASCII_LEN); i++) + *(dst_local + i) = 0; + + /* Copy the prefix to start */ + for (i = 0; i < strlen(TRAMP_SYM_PREFIX); i++) { + *dst_local = *(prefix + i); + dst_local++; + } + + /* Now convert the value passed in to a string equiv of the hex */ + for (i = 0; i < sizeof(value); i++) { +#ifndef _BIG_ENDIAN + tmp = *(((u8 *) &value) + (sizeof(value) - 1) - i); + *dst_local = priv_h2a((tmp & 0xF0) >> 4); + dst_local++; + *dst_local = priv_h2a(tmp & 0x0F); + dst_local++; +#else + tmp = *(((u8 *) &value) + i); + *dst_local = priv_h2a((tmp & 0xF0) >> 4); + dst_local++; + *dst_local = priv_h2a(tmp & 0x0F); + dst_local++; +#endif + } + + /* NULL terminate */ + *dst_local = 0; +} + +/* + * Function: priv_tramp_string_create + * Description: Create a new string specific to the trampoline loading and add + * it to the trampoline string list. This list contains the + * trampoline section name and trampoline point symbols. + */ +static struct tramp_string *priv_tramp_string_create(struct dload_state *dlthis, + u32 str_len, char *str) +{ + struct tramp_string *new_string = NULL; + u32 i; + + /* Create a new string object with the specified size. */ + new_string = + (struct tramp_string *)dlthis->mysym->dload_allocate(dlthis->mysym, + (sizeof + (struct + tramp_string) + + str_len + + 1)); + if (new_string != NULL) { + /* Clear the string first. This ensures the ending NULL is + * present and the optimizer won't touch it. */ + for (i = 0; i < (sizeof(struct tramp_string) + str_len + 1); + i++) + *((u8 *) new_string + i) = 0; + + /* Add this string to our virtual table by assigning it the + * next index and pushing it to the tail of the list. */ + new_string->index = dlthis->tramp.tramp_string_next_index; + dlthis->tramp.tramp_string_next_index++; + dlthis->tramp.tramp_string_size += str_len + 1; + + new_string->next = NULL; + if (dlthis->tramp.string_head == NULL) + dlthis->tramp.string_head = new_string; + else + dlthis->tramp.string_tail->next = new_string; + + dlthis->tramp.string_tail = new_string; + + /* Copy the string over to the new object */ + for (i = 0; i < str_len; i++) + new_string->str[i] = str[i]; + } + + return new_string; +} + +/* + * Function: priv_tramp_string_find + * Description: Walk the trampoline string list and find a match for the + * provided string. If not match is found, NULL is returned. + */ +static struct tramp_string *priv_tramp_string_find(struct dload_state *dlthis, + char *str) +{ + struct tramp_string *cur_str = NULL; + struct tramp_string *ret_val = NULL; + u32 i; + u32 str_len = strlen(str); + + for (cur_str = dlthis->tramp.string_head; + (ret_val == NULL) && (cur_str != NULL); cur_str = cur_str->next) { + /* If the string lengths aren't equal, don't bother + * comparing */ + if (str_len != strlen(cur_str->str)) + continue; + + /* Walk the strings until one of them ends */ + for (i = 0; i < str_len; i++) { + /* If they don't match in the current position then + * break out now, no sense in continuing to look at + * this string. */ + if (str[i] != cur_str->str[i]) + break; + } + + if (i == str_len) + ret_val = cur_str; + } + + return ret_val; +} + +/* + * Function: priv_string_tbl_finalize + * Description: Flatten the trampoline string list into a table of NULL + * terminated strings. This is the same format of string table + * as used by the COFF/DOFF file. + */ +static int priv_string_tbl_finalize(struct dload_state *dlthis) +{ + int ret_val = 0; + struct tramp_string *cur_string; + char *cur_loc; + char *tmp; + + /* Allocate enough space for all strings that have been created. The + * table is simply all strings concatenated together will NULL + * endings. */ + dlthis->tramp.final_string_table = + (char *)dlthis->mysym->dload_allocate(dlthis->mysym, + dlthis->tramp. + tramp_string_size); + if (dlthis->tramp.final_string_table != NULL) { + /* We got our buffer, walk the list and release the nodes as* + * we go */ + cur_loc = dlthis->tramp.final_string_table; + cur_string = dlthis->tramp.string_head; + while (cur_string != NULL) { + /* Move the head/tail pointers */ + dlthis->tramp.string_head = cur_string->next; + if (dlthis->tramp.string_tail == cur_string) + dlthis->tramp.string_tail = NULL; + + /* Copy the string contents */ + for (tmp = cur_string->str; + *tmp != '\0'; tmp++, cur_loc++) + *cur_loc = *tmp; + + /* Pick up the NULL termination since it was missed by + * breaking using it to end the above loop. */ + *cur_loc = '\0'; + cur_loc++; + + /* Free the string node, we don't need it any more. */ + dlthis->mysym->dload_deallocate(dlthis->mysym, + cur_string); + + /* Move our pointer to the next one */ + cur_string = dlthis->tramp.string_head; + } + + /* Update our return value to success */ + ret_val = 1; + } else + dload_error(dlthis, "Failed to allocate trampoline " + "string table"); + + return ret_val; +} + +/* + * Function: priv_tramp_sect_alloc + * Description: Virtually allocate space from the trampoline section. This + * function returns the next offset within the trampoline section + * that is available and moved the next available offset by the + * requested size. NO TARGET ALLOCATION IS DONE AT THIS TIME. + */ +static u32 priv_tramp_sect_alloc(struct dload_state *dlthis, u32 tramp_size) +{ + u32 ret_val; + + /* If the next available address is 0, this is our first allocation. + * Create a section name string to go into the string table . */ + if (dlthis->tramp.tramp_sect_next_addr == 0) { + dload_syms_error(dlthis->mysym, "*** WARNING *** created " + "dynamic TRAMPOLINE section for module %s", + dlthis->str_head); + } + + /* Reserve space for the new trampoline */ + ret_val = dlthis->tramp.tramp_sect_next_addr; + dlthis->tramp.tramp_sect_next_addr += tramp_size; + return ret_val; +} + +/* + * Function: priv_tramp_sym_create + * Description: Allocate and create a new trampoline specific symbol and add + * it to the trampoline symbol list. These symbols will include + * trampoline points as well as the external symbols they + * reference. + */ +static struct tramp_sym *priv_tramp_sym_create(struct dload_state *dlthis, + u32 str_index, + struct local_symbol *tmp_sym) +{ + struct tramp_sym *new_sym = NULL; + u32 i; + + /* Allocate new space for the symbol in the symbol table. */ + new_sym = + (struct tramp_sym *)dlthis->mysym->dload_allocate(dlthis->mysym, + sizeof(struct tramp_sym)); + if (new_sym != NULL) { + for (i = 0; i != sizeof(struct tramp_sym); i++) + *((char *)new_sym + i) = 0; + + /* Assign this symbol the next symbol index for easier + * reference later during relocation. */ + new_sym->index = dlthis->tramp.tramp_sym_next_index; + dlthis->tramp.tramp_sym_next_index++; + + /* Populate the symbol information. At this point any + * trampoline symbols will be the offset location, not the + * final. Copy over the symbol info to start, then be sure to + * get the string index from the trampoline string table. */ + new_sym->sym_info = *tmp_sym; + new_sym->str_index = str_index; + + /* Push the new symbol to the tail of the symbol table list */ + new_sym->next = NULL; + if (dlthis->tramp.symbol_head == NULL) + dlthis->tramp.symbol_head = new_sym; + else + dlthis->tramp.symbol_tail->next = new_sym; + + dlthis->tramp.symbol_tail = new_sym; + } + + return new_sym; +} + +/* + * Function: priv_tramp_sym_get + * Description: Search for the symbol with the matching string index (from + * the trampoline string table) and return the trampoline + * symbol object, if found. Otherwise return NULL. + */ +static struct tramp_sym *priv_tramp_sym_get(struct dload_state *dlthis, + u32 string_index) +{ + struct tramp_sym *sym_found = NULL; + + /* Walk the symbol table list and search vs. the string index */ + for (sym_found = dlthis->tramp.symbol_head; + sym_found != NULL; sym_found = sym_found->next) { + if (sym_found->str_index == string_index) + break; + } + + return sym_found; +} + +/* + * Function: priv_tramp_sym_find + * Description: Search for a trampoline symbol based on the string name of + * the symbol. Return the symbol object, if found, otherwise + * return NULL. + */ +static struct tramp_sym *priv_tramp_sym_find(struct dload_state *dlthis, + char *string) +{ + struct tramp_sym *sym_found = NULL; + struct tramp_string *str_found = NULL; + + /* First, search for the string, then search for the sym based on the + string index. */ + str_found = priv_tramp_string_find(dlthis, string); + if (str_found != NULL) + sym_found = priv_tramp_sym_get(dlthis, str_found->index); + + return sym_found; +} + +/* + * Function: priv_tramp_sym_finalize + * Description: Allocate a flat symbol table for the trampoline section, + * put each trampoline symbol into the table, adjust the + * symbol value based on the section address on the target and + * free the trampoline symbol list nodes. + */ +static int priv_tramp_sym_finalize(struct dload_state *dlthis) +{ + int ret_val = 0; + struct tramp_sym *cur_sym; + struct ldr_section_info *tramp_sect = + &dlthis->ldr_sections[dlthis->allocated_secn_count]; + struct local_symbol *new_sym; + + /* Allocate a table to hold a flattened version of all symbols + * created. */ + dlthis->tramp.final_sym_table = + (struct local_symbol *)dlthis->mysym->dload_allocate(dlthis->mysym, + (sizeof(struct local_symbol) * dlthis->tramp. + tramp_sym_next_index)); + if (dlthis->tramp.final_sym_table != NULL) { + /* Walk the list of all symbols, copy it over to the flattened + * table. After it has been copied, the node can be freed as + * it is no longer needed. */ + new_sym = dlthis->tramp.final_sym_table; + cur_sym = dlthis->tramp.symbol_head; + while (cur_sym != NULL) { + /* Pop it off the list */ + dlthis->tramp.symbol_head = cur_sym->next; + if (cur_sym == dlthis->tramp.symbol_tail) + dlthis->tramp.symbol_tail = NULL; + + /* Copy the symbol contents into the flat table */ + *new_sym = cur_sym->sym_info; + + /* Now finaize the symbol. If it is in the tramp + * section, we need to adjust for the section start. + * If it is external then we don't need to adjust at + * all. + * NOTE: THIS CODE ASSUMES THAT THE TRAMPOLINE IS + * REFERENCED LIKE A CALL TO AN EXTERNAL SO VALUE AND + * DELTA ARE THE SAME. SEE THE FUNCTION dload_symbols + * WHERE DN_UNDEF IS HANDLED FOR MORE REFERENCE. */ + if (new_sym->secnn < 0) { + new_sym->value += tramp_sect->load_addr; + new_sym->delta = new_sym->value; + } + + /* Let go of the symbol node */ + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_sym); + + /* Move to the next node */ + cur_sym = dlthis->tramp.symbol_head; + new_sym++; + } + + ret_val = 1; + } else + dload_error(dlthis, "Failed to alloc trampoline sym table"); + + return ret_val; +} + +/* + * Function: priv_tgt_img_gen + * Description: Allocate storage for and copy the target specific image data + * and fix up its relocations for the new external symbol. If + * a trampoline image packet was successfully created it is added + * to the trampoline list. + */ +static int priv_tgt_img_gen(struct dload_state *dlthis, u32 base, + u32 gen_index, struct tramp_sym *new_ext_sym) +{ + struct tramp_img_pkt *new_img_pkt = NULL; + u32 i; + u32 pkt_size = tramp_img_pkt_size_get(); + u8 *gen_tbl_entry; + u8 *pkt_data; + struct reloc_record_t *cur_relo; + int ret_val = 0; + + /* Allocate a new image packet and set it up. */ + new_img_pkt = + (struct tramp_img_pkt *)dlthis->mysym->dload_allocate(dlthis->mysym, + pkt_size); + if (new_img_pkt != NULL) { + /* Save the base, this is where it goes in the section */ + new_img_pkt->base = base; + + /* Copy over the image data and relos from the target table */ + pkt_data = (u8 *) &new_img_pkt->hdr; + gen_tbl_entry = (u8 *) &tramp_gen_info[gen_index]; + for (i = 0; i < pkt_size; i++) { + *pkt_data = *gen_tbl_entry; + pkt_data++; + gen_tbl_entry++; + } + + /* Update the relocations to point to the external symbol */ + cur_relo = + (struct reloc_record_t *)((u8 *) &new_img_pkt->hdr + + new_img_pkt->hdr.relo_offset); + for (i = 0; i < new_img_pkt->hdr.num_relos; i++) + cur_relo[i].SYMNDX = new_ext_sym->index; + + /* Add it to the trampoline list. */ + new_img_pkt->next = dlthis->tramp.tramp_pkts; + dlthis->tramp.tramp_pkts = new_img_pkt; + + ret_val = 1; + } + + return ret_val; +} + +/* + * Function: priv_pkt_relo + * Description: Take the provided image data and the collection of relocations + * for it and perform the relocations. Note that all relocations + * at this stage are considered SECOND PASS since the original + * image has already been processed in the first pass. This means + * TRAMPOLINES ARE TREATED AS 2ND PASS even though this is really + * the first (and only) relocation that will be performed on them. + */ +static int priv_pkt_relo(struct dload_state *dlthis, tgt_au_t * data, + struct reloc_record_t *rp[], u32 relo_count) +{ + int ret_val = 1; + u32 i; + bool tmp; + + /* Walk through all of the relos and process them. This function is + * the equivalent of relocate_packet() from cload.c, but specialized + * for trampolines and 2nd phase relocations. */ + for (i = 0; i < relo_count; i++) + dload_relocate(dlthis, data, rp[i], &tmp, true); + + return ret_val; +} + +/* + * Function: priv_tramp_pkt_finalize + * Description: Walk the list of all trampoline packets and finalize them. + * Each trampoline image packet will be relocated now that the + * trampoline section has been allocated on the target. Once + * all of the relocations are done the trampoline image data + * is written into target memory and the trampoline packet + * is freed: it is no longer needed after this point. + */ +static int priv_tramp_pkt_finalize(struct dload_state *dlthis) +{ + int ret_val = 1; + struct tramp_img_pkt *cur_pkt = NULL; + struct reloc_record_t *relos[MAX_RELOS_PER_PASS]; + u32 relos_done; + u32 i; + struct reloc_record_t *cur_relo; + struct ldr_section_info *sect_info = + &dlthis->ldr_sections[dlthis->allocated_secn_count]; + + /* Walk the list of trampoline packets and relocate each packet. This + * function is the trampoline equivalent of dload_data() from + * cload.c. */ + cur_pkt = dlthis->tramp.tramp_pkts; + while ((ret_val != 0) && (cur_pkt != NULL)) { + /* Remove the pkt from the list */ + dlthis->tramp.tramp_pkts = cur_pkt->next; + + /* Setup section and image offset information for the relo */ + dlthis->image_secn = sect_info; + dlthis->image_offset = cur_pkt->base; + dlthis->delta_runaddr = sect_info->run_addr; + + /* Walk through all relos for the packet */ + relos_done = 0; + cur_relo = (struct reloc_record_t *)((u8 *) &cur_pkt->hdr + + cur_pkt->hdr.relo_offset); + while (relos_done < cur_pkt->hdr.num_relos) { +#ifdef ENABLE_TRAMP_DEBUG + dload_syms_error(dlthis->mysym, + "===> Trampoline %x branches to %x", + sect_info->run_addr + + dlthis->image_offset, + dlthis-> + tramp.final_sym_table[cur_relo-> + SYMNDX].value); +#endif + + for (i = 0; + ((i < MAX_RELOS_PER_PASS) && + ((i + relos_done) < cur_pkt->hdr.num_relos)); i++) + relos[i] = cur_relo + i; + + /* Do the actual relo */ + ret_val = priv_pkt_relo(dlthis, + (tgt_au_t *) &cur_pkt->payload, + relos, i); + if (ret_val == 0) { + dload_error(dlthis, + "Relocation of trampoline pkt at %x" + " failed", cur_pkt->base + + sect_info->run_addr); + break; + } + + relos_done += i; + cur_relo += i; + } + + /* Make sure we didn't hit a problem */ + if (ret_val != 0) { + /* Relos are done for the packet, write it to the + * target */ + ret_val = dlthis->myio->writemem(dlthis->myio, + &cur_pkt->payload, + sect_info->load_addr + + cur_pkt->base, + sect_info, + BYTE_TO_HOST + (cur_pkt->hdr. + tramp_code_size)); + if (ret_val == 0) { + dload_error(dlthis, + "Write to " FMT_UI32 " failed", + sect_info->load_addr + + cur_pkt->base); + } + + /* Done with the pkt, let it go */ + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_pkt); + + /* Get the next packet to process */ + cur_pkt = dlthis->tramp.tramp_pkts; + } + } + + return ret_val; +} + +/* + * Function: priv_dup_pkt_finalize + * Description: Walk the list of duplicate image packets and finalize them. + * Each duplicate packet will be relocated again for the + * relocations that previously failed and have been adjusted + * to point at a trampoline. Once all relocations for a packet + * have been done, write the packet into target memory. The + * duplicate packet and its relocation chain are all freed + * after use here as they are no longer needed after this. + */ +static int priv_dup_pkt_finalize(struct dload_state *dlthis) +{ + int ret_val = 1; + struct tramp_img_dup_pkt *cur_pkt; + struct tramp_img_dup_relo *cur_relo; + struct reloc_record_t *relos[MAX_RELOS_PER_PASS]; + struct doff_scnhdr_t *sect_hdr = NULL; + s32 i; + + /* Similar to the trampoline pkt finalize, this function walks each dup + * pkt that was generated and performs all relocations that were + * deferred to a 2nd pass. This is the equivalent of dload_data() from + * cload.c, but does not need the additional reorder and checksum + * processing as it has already been done. */ + cur_pkt = dlthis->tramp.dup_pkts; + while ((ret_val != 0) && (cur_pkt != NULL)) { + /* Remove the node from the list, we'll be freeing it + * shortly */ + dlthis->tramp.dup_pkts = cur_pkt->next; + + /* Setup the section and image offset for relocation */ + dlthis->image_secn = &dlthis->ldr_sections[cur_pkt->secnn]; + dlthis->image_offset = cur_pkt->offset; + + /* In order to get the delta run address, we need to reference + * the original section header. It's a bit ugly, but needed + * for relo. */ + i = (s32) (dlthis->image_secn - dlthis->ldr_sections); + sect_hdr = dlthis->sect_hdrs + i; + dlthis->delta_runaddr = sect_hdr->ds_paddr; + + /* Walk all relos in the chain and process each. */ + cur_relo = cur_pkt->relo_chain; + while (cur_relo != NULL) { + /* Process them a chunk at a time to be efficient */ + for (i = 0; (i < MAX_RELOS_PER_PASS) + && (cur_relo != NULL); + i++, cur_relo = cur_relo->next) { + relos[i] = &cur_relo->relo; + cur_pkt->relo_chain = cur_relo->next; + } + + /* Do the actual relo */ + ret_val = priv_pkt_relo(dlthis, + cur_pkt->img_pkt.img_data, + relos, i); + if (ret_val == 0) { + dload_error(dlthis, + "Relocation of dup pkt at %x" + " failed", cur_pkt->offset + + dlthis->image_secn->run_addr); + break; + } + + /* Release all of these relos, we're done with them */ + while (i > 0) { + dlthis->mysym->dload_deallocate(dlthis->mysym, + GET_CONTAINER + (relos[i - 1], + struct tramp_img_dup_relo, + relo)); + i--; + } + + /* DO NOT ADVANCE cur_relo, IT IS ALREADY READY TO + * GO! */ + } + + /* Done with all relos. Make sure we didn't have a problem and + * write it out to the target */ + if (ret_val != 0) { + ret_val = dlthis->myio->writemem(dlthis->myio, + cur_pkt->img_pkt. + img_data, + dlthis->image_secn-> + load_addr + + cur_pkt->offset, + dlthis->image_secn, + BYTE_TO_HOST + (cur_pkt->img_pkt. + packet_size)); + if (ret_val == 0) { + dload_error(dlthis, + "Write to " FMT_UI32 " failed", + dlthis->image_secn->load_addr + + cur_pkt->offset); + } + + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_pkt); + + /* Advance to the next packet */ + cur_pkt = dlthis->tramp.dup_pkts; + } + } + + return ret_val; +} + +/* + * Function: priv_dup_find + * Description: Walk the list of existing duplicate packets and find a + * match based on the section number and image offset. Return + * the duplicate packet if found, otherwise NULL. + */ +static struct tramp_img_dup_pkt *priv_dup_find(struct dload_state *dlthis, + s16 secnn, u32 image_offset) +{ + struct tramp_img_dup_pkt *cur_pkt = NULL; + + for (cur_pkt = dlthis->tramp.dup_pkts; + cur_pkt != NULL; cur_pkt = cur_pkt->next) { + if ((cur_pkt->secnn == secnn) && + (cur_pkt->offset == image_offset)) { + /* Found a match, break out */ + break; + } + } + + return cur_pkt; +} + +/* + * Function: priv_img_pkt_dup + * Description: Duplicate the original image packet. If this is the first + * time this image packet has been seen (based on section number + * and image offset), create a new duplicate packet and add it + * to the dup packet list. If not, just get the existing one and + * update it with the current packet contents (since relocation + * on the packet is still ongoing in first pass.) Create a + * duplicate of the provided relocation, but update it to point + * to the new trampoline symbol. Add the new relocation dup to + * the dup packet's relo chain for 2nd pass relocation later. + */ +static int priv_img_pkt_dup(struct dload_state *dlthis, + s16 secnn, u32 image_offset, + struct image_packet_t *ipacket, + struct reloc_record_t *rp, + struct tramp_sym *new_tramp_sym) +{ + struct tramp_img_dup_pkt *dup_pkt = NULL; + u32 new_dup_size; + s32 i; + int ret_val = 0; + struct tramp_img_dup_relo *dup_relo = NULL; + + /* Determinne if this image packet is already being tracked in the + dup list for other trampolines. */ + dup_pkt = priv_dup_find(dlthis, secnn, image_offset); + + if (dup_pkt == NULL) { + /* This image packet does not exist in our tracking, so create + * a new one and add it to the head of the list. */ + new_dup_size = sizeof(struct tramp_img_dup_pkt) + + ipacket->packet_size; + + dup_pkt = (struct tramp_img_dup_pkt *) + dlthis->mysym->dload_allocate(dlthis->mysym, new_dup_size); + if (dup_pkt != NULL) { + /* Save off the section and offset information */ + dup_pkt->secnn = secnn; + dup_pkt->offset = image_offset; + dup_pkt->relo_chain = NULL; + + /* Copy the original packet content */ + dup_pkt->img_pkt = *ipacket; + dup_pkt->img_pkt.img_data = (u8 *) (dup_pkt + 1); + for (i = 0; i < ipacket->packet_size; i++) + *(dup_pkt->img_pkt.img_data + i) = + *(ipacket->img_data + i); + + /* Add the packet to the dup list */ + dup_pkt->next = dlthis->tramp.dup_pkts; + dlthis->tramp.dup_pkts = dup_pkt; + } else + dload_error(dlthis, "Failed to create dup packet!"); + } else { + /* The image packet contents could have changed since + * trampoline detection happens during relocation of the image + * packets. So, we need to update the image packet contents + * before adding relo information. */ + for (i = 0; i < dup_pkt->img_pkt.packet_size; i++) + *(dup_pkt->img_pkt.img_data + i) = + *(ipacket->img_data + i); + } + + /* Since the previous code may have allocated a new dup packet for us, + double check that we actually have one. */ + if (dup_pkt != NULL) { + /* Allocate a new node for the relo chain. Each image packet + * can potentially have multiple relocations that cause a + * trampoline to be generated. So, we keep them in a chain, + * order is not important. */ + dup_relo = dlthis->mysym->dload_allocate(dlthis->mysym, + sizeof(struct tramp_img_dup_relo)); + if (dup_relo != NULL) { + /* Copy the relo contents, adjust for the new + * trampoline and add it to the list. */ + dup_relo->relo = *rp; + dup_relo->relo.SYMNDX = new_tramp_sym->index; + + dup_relo->next = dup_pkt->relo_chain; + dup_pkt->relo_chain = dup_relo; + + /* That's it, we're done. Make sure we update our + * return value to be success since everything finished + * ok */ + ret_val = 1; + } else + dload_error(dlthis, "Unable to alloc dup relo"); + } + + return ret_val; +} + +/* + * Function: dload_tramp_avail + * Description: Check to see if the target supports a trampoline for this type + * of relocation. Return true if it does, otherwise false. + */ +bool dload_tramp_avail(struct dload_state *dlthis, struct reloc_record_t *rp) +{ + bool ret_val = false; + u16 map_index; + u16 gen_index; + + /* Check type hash vs. target tramp table */ + map_index = HASH_FUNC(rp->TYPE); + gen_index = tramp_map[map_index]; + if (gen_index != TRAMP_NO_GEN_AVAIL) + ret_val = true; + + return ret_val; +} + +/* + * Function: dload_tramp_generate + * Description: Create a new trampoline for the provided image packet and + * relocation causing problems. This will create the trampoline + * as well as duplicate/update the image packet and relocation + * causing the problem, which will be relo'd again during + * finalization. + */ +int dload_tramp_generate(struct dload_state *dlthis, s16 secnn, + u32 image_offset, struct image_packet_t *ipacket, + struct reloc_record_t *rp) +{ + u16 map_index; + u16 gen_index; + int ret_val = 1; + char tramp_sym_str[TRAMP_SYM_PREFIX_LEN + TRAMP_SYM_HEX_ASCII_LEN]; + struct local_symbol *ref_sym; + struct tramp_sym *new_tramp_sym; + struct tramp_sym *new_ext_sym; + struct tramp_string *new_tramp_str; + u32 new_tramp_base; + struct local_symbol tmp_sym; + struct local_symbol ext_tmp_sym; + + /* Hash the relo type to get our generator information */ + map_index = HASH_FUNC(rp->TYPE); + gen_index = tramp_map[map_index]; + if (gen_index != TRAMP_NO_GEN_AVAIL) { + /* If this is the first trampoline, create the section name in + * our string table for debug help later. */ + if (dlthis->tramp.string_head == NULL) { + priv_tramp_string_create(dlthis, + strlen(TRAMP_SECT_NAME), + TRAMP_SECT_NAME); + } +#ifdef ENABLE_TRAMP_DEBUG + dload_syms_error(dlthis->mysym, + "Trampoline at img loc %x, references %x", + dlthis->ldr_sections[secnn].run_addr + + image_offset + rp->vaddr, + dlthis->local_symtab[rp->SYMNDX].value); +#endif + + /* Generate the trampoline string, check if already defined. + * If the relo symbol index is -1, it means we need the section + * info for relo later. To do this we'll dummy up a symbol + * with the section delta and run addresses. */ + if (rp->SYMNDX == -1) { + ext_tmp_sym.value = + dlthis->ldr_sections[secnn].run_addr; + ext_tmp_sym.delta = dlthis->sect_hdrs[secnn].ds_paddr; + ref_sym = &ext_tmp_sym; + } else + ref_sym = &(dlthis->local_symtab[rp->SYMNDX]); + + priv_tramp_sym_gen_name(ref_sym->value, tramp_sym_str); + new_tramp_sym = priv_tramp_sym_find(dlthis, tramp_sym_str); + if (new_tramp_sym == NULL) { + /* If tramp string not defined, create it and a new + * string, and symbol for it as well as the original + * symbol which caused the trampoline. */ + new_tramp_str = priv_tramp_string_create(dlthis, + strlen + (tramp_sym_str), + tramp_sym_str); + if (new_tramp_str == NULL) { + dload_error(dlthis, "Failed to create new " + "trampoline string\n"); + ret_val = 0; + } else { + /* Allocate tramp section space for the new + * tramp from the target */ + new_tramp_base = priv_tramp_sect_alloc(dlthis, + tramp_size_get()); + + /* We have a string, create the new symbol and + * duplicate the external. */ + tmp_sym.value = new_tramp_base; + tmp_sym.delta = 0; + tmp_sym.secnn = -1; + tmp_sym.sclass = 0; + new_tramp_sym = priv_tramp_sym_create(dlthis, + new_tramp_str-> + index, + &tmp_sym); + + new_ext_sym = priv_tramp_sym_create(dlthis, -1, + ref_sym); + + if ((new_tramp_sym != NULL) && + (new_ext_sym != NULL)) { + /* Call the image generator to get the + * new image data and fix up its + * relocations for the external + * symbol. */ + ret_val = priv_tgt_img_gen(dlthis, + new_tramp_base, + gen_index, + new_ext_sym); + + /* Add generated image data to tramp + * image list */ + if (ret_val != 1) { + dload_error(dlthis, "Failed to " + "create img pkt for" + " trampoline\n"); + } + } else { + dload_error(dlthis, "Failed to create " + "new tramp syms " + "(%8.8X, %8.8X)\n", + new_tramp_sym, new_ext_sym); + ret_val = 0; + } + } + } + + /* Duplicate the image data and relo record that caused the + * tramp, including update the relo data to point to the tramp + * symbol. */ + if (ret_val == 1) { + ret_val = priv_img_pkt_dup(dlthis, secnn, image_offset, + ipacket, rp, new_tramp_sym); + if (ret_val != 1) { + dload_error(dlthis, "Failed to create dup of " + "original img pkt\n"); + } + } + } + + return ret_val; +} + +/* + * Function: dload_tramp_pkt_update + * Description: Update the duplicate copy of this image packet, which the + * trampoline layer is already tracking. This is call is critical + * to make if trampolines were generated anywhere within the + * packet and first pass relo continued on the remainder. The + * trampoline layer needs the updates image data so when 2nd + * pass relo is done during finalize the image packet can be + * written to the target since all relo is done. + */ +int dload_tramp_pkt_udpate(struct dload_state *dlthis, s16 secnn, + u32 image_offset, struct image_packet_t *ipacket) +{ + struct tramp_img_dup_pkt *dup_pkt = NULL; + s32 i; + int ret_val = 0; + + /* Find the image packet in question, the caller needs us to update it + since a trampoline was previously generated. */ + dup_pkt = priv_dup_find(dlthis, secnn, image_offset); + if (dup_pkt != NULL) { + for (i = 0; i < dup_pkt->img_pkt.packet_size; i++) + *(dup_pkt->img_pkt.img_data + i) = + *(ipacket->img_data + i); + + ret_val = 1; + } else { + dload_error(dlthis, + "Unable to find existing DUP pkt for %x, offset %x", + secnn, image_offset); + + } + + return ret_val; +} + +/* + * Function: dload_tramp_finalize + * Description: If any trampolines were created, finalize everything on the + * target by allocating the trampoline section on the target, + * finalizing the trampoline symbols, finalizing the trampoline + * packets (write the new section to target memory) and finalize + * the duplicate packets by doing 2nd pass relo over them. + */ +int dload_tramp_finalize(struct dload_state *dlthis) +{ + int ret_val = 1; + + if (dlthis->tramp.tramp_sect_next_addr != 0) { + /* Finalize strings into a flat table. This is needed so it + * can be added to the debug string table later. */ + ret_val = priv_string_tbl_finalize(dlthis); + + /* Do target allocation for section BEFORE finalizing + * symbols. */ + if (ret_val != 0) + ret_val = priv_tramp_sect_tgt_alloc(dlthis); + + /* Finalize symbols with their correct target information and + * flatten */ + if (ret_val != 0) + ret_val = priv_tramp_sym_finalize(dlthis); + + /* Finalize all trampoline packets. This performs the + * relocation on the packets as well as writing them to target + * memory. */ + if (ret_val != 0) + ret_val = priv_tramp_pkt_finalize(dlthis); + + /* Perform a 2nd pass relocation on the dup list. */ + if (ret_val != 0) + ret_val = priv_dup_pkt_finalize(dlthis); + } + + return ret_val; +} + +/* + * Function: dload_tramp_cleanup + * Description: Release all temporary resources used in the trampoline layer. + * Note that the target memory which may have been allocated and + * written to store the trampolines is NOT RELEASED HERE since it + * is potentially still in use. It is automatically released + * when the module is unloaded. + */ +void dload_tramp_cleanup(struct dload_state *dlthis) +{ + struct tramp_info *tramp = &dlthis->tramp; + struct tramp_sym *cur_sym; + struct tramp_string *cur_string; + struct tramp_img_pkt *cur_tramp_pkt; + struct tramp_img_dup_pkt *cur_dup_pkt; + struct tramp_img_dup_relo *cur_dup_relo; + + /* If there were no tramps generated, just return */ + if (tramp->tramp_sect_next_addr == 0) + return; + + /* Destroy all tramp information */ + for (cur_sym = tramp->symbol_head; + cur_sym != NULL; cur_sym = tramp->symbol_head) { + tramp->symbol_head = cur_sym->next; + if (tramp->symbol_tail == cur_sym) + tramp->symbol_tail = NULL; + + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_sym); + } + + if (tramp->final_sym_table != NULL) + dlthis->mysym->dload_deallocate(dlthis->mysym, + tramp->final_sym_table); + + for (cur_string = tramp->string_head; + cur_string != NULL; cur_string = tramp->string_head) { + tramp->string_head = cur_string->next; + if (tramp->string_tail == cur_string) + tramp->string_tail = NULL; + + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_string); + } + + if (tramp->final_string_table != NULL) + dlthis->mysym->dload_deallocate(dlthis->mysym, + tramp->final_string_table); + + for (cur_tramp_pkt = tramp->tramp_pkts; + cur_tramp_pkt != NULL; cur_tramp_pkt = tramp->tramp_pkts) { + tramp->tramp_pkts = cur_tramp_pkt->next; + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_tramp_pkt); + } + + for (cur_dup_pkt = tramp->dup_pkts; + cur_dup_pkt != NULL; cur_dup_pkt = tramp->dup_pkts) { + tramp->dup_pkts = cur_dup_pkt->next; + + for (cur_dup_relo = cur_dup_pkt->relo_chain; + cur_dup_relo != NULL; + cur_dup_relo = cur_dup_pkt->relo_chain) { + cur_dup_pkt->relo_chain = cur_dup_relo->next; + dlthis->mysym->dload_deallocate(dlthis->mysym, + cur_dup_relo); + } + + dlthis->mysym->dload_deallocate(dlthis->mysym, cur_dup_pkt); + } +} |