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Removal of old, decrepit bitalign patching code; fix for master not compiling after WhirlpoolX mergewindows
troky
10 years ago
7 changed files with 7 additions and 191 deletions
@ -1,97 +0,0 @@
@@ -1,97 +0,0 @@
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#include "patch_kernel.h" |
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#include "logging.h" |
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#include <string.h> |
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#include <stdint.h> |
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static int advance(char **area, unsigned *remaining, const char *marker) |
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{ |
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char *find = (char *)memmem(*area, *remaining, (void *)marker, strlen(marker)); |
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if (!find) { |
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applog(LOG_DEBUG, "Marker \"%s\" not found", marker); |
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return 0; |
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} |
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*remaining -= find - *area; |
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*area = find; |
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return 1; |
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} |
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#define OP3_INST_BFE_UINT 4ULL |
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#define OP3_INST_BFE_INT 5ULL |
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#define OP3_INST_BFI_INT 6ULL |
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#define OP3_INST_BIT_ALIGN_INT 12ULL |
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#define OP3_INST_BYTE_ALIGN_INT 13ULL |
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static void patch_opcodes(char *w, unsigned remaining) |
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{ |
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uint64_t *opcode = (uint64_t *)w; |
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int patched = 0; |
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int count_bfe_int = 0; |
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int count_bfe_uint = 0; |
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int count_byte_align = 0; |
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while (42) { |
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int clamp = (*opcode >> (32 + 31)) & 0x1; |
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int dest_rel = (*opcode >> (32 + 28)) & 0x1; |
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int alu_inst = (*opcode >> (32 + 13)) & 0x1f; |
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int s2_neg = (*opcode >> (32 + 12)) & 0x1; |
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int s2_rel = (*opcode >> (32 + 9)) & 0x1; |
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int pred_sel = (*opcode >> 29) & 0x3; |
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if (!clamp && !dest_rel && !s2_neg && !s2_rel && !pred_sel) { |
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if (alu_inst == OP3_INST_BFE_INT) { |
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count_bfe_int++; |
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} else if (alu_inst == OP3_INST_BFE_UINT) { |
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count_bfe_uint++; |
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} else if (alu_inst == OP3_INST_BYTE_ALIGN_INT) { |
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count_byte_align++; |
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// patch this instruction to BFI_INT
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*opcode &= 0xfffc1fffffffffffULL; |
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*opcode |= OP3_INST_BFI_INT << (32 + 13); |
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patched++; |
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} |
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} |
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if (remaining <= 8) |
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break; |
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opcode++; |
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remaining -= 8; |
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} |
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applog(LOG_DEBUG, "Potential OP3 instructions identified: " |
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"%i BFE_INT, %i BFE_UINT, %i BYTE_ALIGN", |
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count_bfe_int, count_bfe_uint, count_byte_align); |
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applog(LOG_DEBUG, "Patched a total of %i BFI_INT instructions", patched); |
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} |
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bool kernel_bfi_patch(char *binary, unsigned binary_size) |
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{ |
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unsigned remaining = binary_size; |
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char *w = binary; |
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unsigned int start, length; |
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/* Find 2nd incidence of .text, and copy the program's
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* position and length at a fixed offset from that. Then go |
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* back and find the 2nd incidence of \x7ELF (rewind by one |
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* from ELF) and then patch the opcocdes */ |
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if (!advance(&w, &remaining, ".text")) |
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return false; |
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w++; remaining--; |
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if (!advance(&w, &remaining, ".text")) { |
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/* 32 bit builds only one ELF */ |
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w--; remaining++; |
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} |
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memcpy(&start, w + 285, 4); |
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memcpy(&length, w + 289, 4); |
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w = binary; remaining = binary_size; |
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if (!advance(&w, &remaining, "ELF")) |
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return false; |
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w++; remaining--; |
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if (!advance(&w, &remaining, "ELF")) { |
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/* 32 bit builds only one ELF */ |
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w--; remaining++; |
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} |
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w--; remaining++; |
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w += start; remaining -= start; |
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applog(LOG_DEBUG, "At %p (%u rem. bytes), to begin patching", |
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w, remaining); |
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patch_opcodes(w, length); |
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return true; |
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} |
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