From: Pierre-Marc Fournier Date: Tue, 3 Nov 2009 23:46:43 +0000 (-0500) Subject: save registers: update X-Git-Tag: v0.1~60 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=636ca5d6fed61d16178a2e29038a6ffea26677fa;p=ust.git save registers: update --- diff --git a/include/ust/processor.h b/include/ust/processor.h index b9a2f64..bc24e7e 100644 --- a/include/ust/processor.h +++ b/include/ust/processor.h @@ -2,6 +2,11 @@ #define UST_PROCESSOR_H #include +#include + +extern __thread long ust_reg_stack[500]; +extern volatile __thread long *ust_reg_stack_ptr; + #ifdef X86_32 @@ -35,71 +40,133 @@ static inline save_registers(struct registers *regs) #else struct registers { - unsigned long rax; - unsigned long rbx; - unsigned long rcx; - unsigned long rdx; - unsigned long rbp; - unsigned long rsp; + int padding; /* 4 bytes */ + short ss; + short cs; + unsigned long rflags; + unsigned long r15; + unsigned long r14; + unsigned long r13; + unsigned long r12; + unsigned long r11; + unsigned long r10; + unsigned long r9; + unsigned long r8; unsigned long rsi; + unsigned long rbp; + unsigned long rdx; + unsigned long rcx; unsigned long rdi; - unsigned long r8; - unsigned long r9; - unsigned long r10; - unsigned long r11; - unsigned long r12; - unsigned long r13; - unsigned long r14; - unsigned long r15; - int cs; - int ss; - unsigned long rflags; + unsigned long rbx; + unsigned long rax; + unsigned long rsp; }; #define save_registers(regsptr) \ - asm ("movq %%rax,%c[rax_off](%[regs])\n\t" \ - "movq %%rbx,%c[rbx_off](%[regs])\n\t" \ - "movq %%rcx,%c[rcx_off](%[regs])\n\t" \ - "movq %%rdx,%c[rdx_off](%[regs])\n\t" \ - "movq %%rbp,%c[rbp_off](%[regs])\n\t" \ - "movq %%rsp,%c[rsp_off](%[regs])\n\t" \ - "movq %%rsi,%c[rsi_off](%[regs])\n\t" \ - "movq %%rdi,%c[rdi_off](%[regs])\n\t" \ - "movq %%r8,%c[r8_off](%[regs])\n\t" \ - "movq %%r9,%c[r9_off](%[regs])\n\t" \ - "movq %%r10,%c[r10_off](%[regs])\n\t" \ - "movq %%r11,%c[r11_off](%[regs])\n\t" \ - "movq %%r12,%c[r12_off](%[regs])\n\t" \ - "movq %%r13,%c[r13_off](%[regs])\n\t" \ - "movq %%r14,%c[r14_off](%[regs])\n\t" \ - "movq %%r15,%c[r15_off](%[regs])\n\t" \ - "movw %%cs,%c[cs_off](%[regs])\n\t" \ - "movw %%ss,%c[ss_off](%[regs])\n\t" \ + if(ust_reg_stack_ptr == NULL) { \ + ust_reg_stack_ptr = (long*)((long)ust_reg_stack)+500; \ + } \ + asm volatile ( \ + /* save original rsp */ \ + "pushq %%rsp\n\t" \ + /* rax will hold the ptr to the private stack bottom */ \ + "pushq %%rax\n\t" \ + /* rbx will be used to temporarily hold the stack bottom addr */ \ + "pushq %%rbx\n\t" \ + /* rdi is the input to __tls_get_addr, and also a temp var */ \ + "pushq %%rdi\n\t" \ + /* Start TLS access of private reg stack */ \ + ".byte 0x66\n\t" \ + "leaq ust_reg_stack_ptr@tlsgd(%%rip), %%rdi\n\t" \ + ".word 0x6666\n\t" \ + "rex64\n\t" \ + "call __tls_get_addr@plt\n\t" \ + /* --- End TLS access */ \ + /* Manually push rsp to private stack */ \ + "addq $-8,(%%rax)\n\t" \ + "movq 24(%%rsp), %%rdi\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rdi, (%%rbx)\n\t" \ + /* Manually push rax to private stack */ \ + "addq $-8,(%%rax)\n\t" \ + "movq 16(%%rsp), %%rdi\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rdi, (%%rbx)\n\t" \ + /* Manually push rbx to private stack */ \ + "addq $-8,(%%rax)\n\t" \ + "movq 8(%%rsp), %%rdi\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rdi, (%%rbx)\n\t" \ + /* Manually push rdi to private stack */ \ + "addq $-8,(%%rax)\n\t" \ + "movq 0(%%rsp), %%rdi\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rdi, (%%rbx)\n\t" \ + /* now push regs to tls */ \ + /* -- rsp already pushed -- */ \ + /* -- rax already pushed -- */ \ + /* -- rbx already pushed -- */ \ + /* -- rdi already pushed -- */ \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rcx,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rdx,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rbp,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%rsi,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r8,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r9,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r10,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r11,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r12,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r13,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r14,(%%rbx)\n\t" \ + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movq %%r15,(%%rbx)\n\t" \ /* deal with rflags */ \ "pushfq\n\t" /* push rflags on stack */ \ - "popq %c[rflags_off](%[regs])\n\t" \ - : \ - : [regs] "r" (regsptr), \ - [rax_off] "i" (offsetof(struct registers, rax)), \ - [rbx_off] "i" (offsetof(struct registers, rbx)), \ - [rcx_off] "i" (offsetof(struct registers, rcx)), \ - [rdx_off] "i" (offsetof(struct registers, rdx)), \ - [rbp_off] "i" (offsetof(struct registers, rbp)), \ - [rsp_off] "i" (offsetof(struct registers, rsp)), \ - [rsi_off] "i" (offsetof(struct registers, rsi)), \ - [rdi_off] "i" (offsetof(struct registers, rdi)), \ - [r8_off] "i" (offsetof(struct registers, r8)), \ - [r9_off] "i" (offsetof(struct registers, r9)), \ - [r10_off] "i" (offsetof(struct registers, r10)), \ - [r11_off] "i" (offsetof(struct registers, r11)), \ - [r12_off] "i" (offsetof(struct registers, r12)), \ - [r13_off] "i" (offsetof(struct registers, r13)), \ - [r14_off] "i" (offsetof(struct registers, r14)), \ - [r15_off] "i" (offsetof(struct registers, r15)), \ - [cs_off] "i" (offsetof(struct registers, cs)), \ - [ss_off] "i" (offsetof(struct registers, ss)), \ - [rflags_off] "i" (offsetof(struct registers, rflags)) \ - ); + "addq $-8,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "popq (%%rbx)\n\t" \ + /* push cs */ \ + "addq $-2,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movw %%cs, (%%rbx)\n\t" \ + /* push ss */ \ + "addq $-2,(%%rax)\n\t" \ + "movq (%%rax), %%rbx\n\t" \ + "movw %%ss, (%%rbx)\n\t" \ + /* add padding for struct registers */ \ + "addq $-4,(%%rax)\n\t" \ + /* restore original values of regs that were used internally */ \ + "popq %%rdi\n\t" \ + "popq %%rbx\n\t" \ + "popq %%rax\n\t" \ + /* cancel push of rsp */ \ + "addq $8,%%rsp\n\t" \ + ::); \ + memcpy(regsptr, (void *)ust_reg_stack_ptr, sizeof(struct registers)); \ + ust_reg_stack_ptr = (void *)(((long)ust_reg_stack_ptr) + sizeof(struct registers)); /* Macro to insert the address of a relative jump in an assembly stub, * in a relocatable way. On x86-64, this uses a special (%rip) notation. */ diff --git a/libust/marker.c b/libust/marker.c index b543b16..47b6d11 100644 --- a/libust/marker.c +++ b/libust/marker.c @@ -41,6 +41,9 @@ #include "tracercore.h" #include "tracer.h" +__thread long ust_reg_stack[500]; +volatile __thread long *ust_reg_stack_ptr = (long *) 0; + extern struct marker __start___markers[] __attribute__((visibility("hidden"))); extern struct marker __stop___markers[] __attribute__((visibility("hidden"))); extern struct marker_addr __start___marker_addr[] __attribute__((visibility("hidden")));