diff options
Diffstat (limited to 'arch/x86/include/asm/calling.h')
| -rw-r--r-- | arch/x86/include/asm/calling.h | 228 |
1 files changed, 125 insertions, 103 deletions
diff --git a/arch/x86/include/asm/calling.h b/arch/x86/include/asm/calling.h index 30af5a83216..cb4c73bfeb4 100644 --- a/arch/x86/include/asm/calling.h +++ b/arch/x86/include/asm/calling.h @@ -46,110 +46,96 @@ For 32-bit we have the following conventions - kernel is built with */ +#include <asm/dwarf2.h> + +#ifdef CONFIG_X86_64 /* - * 64-bit system call stack frame layout defines and helpers, for - * assembly code (note that the seemingly unnecessary parentheses - * are to prevent cpp from inserting spaces in expressions that get - * passed to macros): + * 64-bit system call stack frame layout defines and helpers, + * for assembly code: */ -#define R15 (0) -#define R14 (8) -#define R13 (16) -#define R12 (24) -#define RBP (32) -#define RBX (40) +#define R15 0 +#define R14 8 +#define R13 16 +#define R12 24 +#define RBP 32 +#define RBX 40 /* arguments: interrupts/non tracing syscalls only save up to here: */ -#define R11 (48) -#define R10 (56) -#define R9 (64) -#define R8 (72) -#define RAX (80) -#define RCX (88) -#define RDX (96) -#define RSI (104) -#define RDI (112) -#define ORIG_RAX (120) /* + error_code */ +#define R11 48 +#define R10 56 +#define R9 64 +#define R8 72 +#define RAX 80 +#define RCX 88 +#define RDX 96 +#define RSI 104 +#define RDI 112 +#define ORIG_RAX 120 /* + error_code */ /* end of arguments */ /* cpu exception frame or undefined in case of fast syscall: */ -#define RIP (128) -#define CS (136) -#define EFLAGS (144) -#define RSP (152) -#define SS (160) +#define RIP 128 +#define CS 136 +#define EFLAGS 144 +#define RSP 152 +#define SS 160 #define ARGOFFSET R11 #define SWFRAME ORIG_RAX - .macro SAVE_ARGS addskip=0, norcx=0, nor891011=0 + .macro SAVE_ARGS addskip=0, save_rcx=1, save_r891011=1 subq $9*8+\addskip, %rsp CFI_ADJUST_CFA_OFFSET 9*8+\addskip - movq %rdi, 8*8(%rsp) - CFI_REL_OFFSET rdi, 8*8 - movq %rsi, 7*8(%rsp) - CFI_REL_OFFSET rsi, 7*8 - movq %rdx, 6*8(%rsp) - CFI_REL_OFFSET rdx, 6*8 - .if \norcx - .else - movq %rcx, 5*8(%rsp) - CFI_REL_OFFSET rcx, 5*8 + movq_cfi rdi, 8*8 + movq_cfi rsi, 7*8 + movq_cfi rdx, 6*8 + + .if \save_rcx + movq_cfi rcx, 5*8 .endif - movq %rax, 4*8(%rsp) - CFI_REL_OFFSET rax, 4*8 - .if \nor891011 - .else - movq %r8, 3*8(%rsp) - CFI_REL_OFFSET r8, 3*8 - movq %r9, 2*8(%rsp) - CFI_REL_OFFSET r9, 2*8 - movq %r10, 1*8(%rsp) - CFI_REL_OFFSET r10, 1*8 - movq %r11, (%rsp) - CFI_REL_OFFSET r11, 0*8 + + movq_cfi rax, 4*8 + + .if \save_r891011 + movq_cfi r8, 3*8 + movq_cfi r9, 2*8 + movq_cfi r10, 1*8 + movq_cfi r11, 0*8 .endif + .endm #define ARG_SKIP (9*8) - .macro RESTORE_ARGS skiprax=0, addskip=0, skiprcx=0, skipr11=0, \ - skipr8910=0, skiprdx=0 - .if \skipr11 - .else - movq (%rsp), %r11 - CFI_RESTORE r11 + .macro RESTORE_ARGS rstor_rax=1, addskip=0, rstor_rcx=1, rstor_r11=1, \ + rstor_r8910=1, rstor_rdx=1 + .if \rstor_r11 + movq_cfi_restore 0*8, r11 .endif - .if \skipr8910 - .else - movq 1*8(%rsp), %r10 - CFI_RESTORE r10 - movq 2*8(%rsp), %r9 - CFI_RESTORE r9 - movq 3*8(%rsp), %r8 - CFI_RESTORE r8 + + .if \rstor_r8910 + movq_cfi_restore 1*8, r10 + movq_cfi_restore 2*8, r9 + movq_cfi_restore 3*8, r8 .endif - .if \skiprax - .else - movq 4*8(%rsp), %rax - CFI_RESTORE rax + + .if \rstor_rax + movq_cfi_restore 4*8, rax .endif - .if \skiprcx - .else - movq 5*8(%rsp), %rcx - CFI_RESTORE rcx + + .if \rstor_rcx + movq_cfi_restore 5*8, rcx .endif - .if \skiprdx - .else - movq 6*8(%rsp), %rdx - CFI_RESTORE rdx + + .if \rstor_rdx + movq_cfi_restore 6*8, rdx .endif - movq 7*8(%rsp), %rsi - CFI_RESTORE rsi - movq 8*8(%rsp), %rdi - CFI_RESTORE rdi + + movq_cfi_restore 7*8, rsi + movq_cfi_restore 8*8, rdi + .if ARG_SKIP+\addskip > 0 addq $ARG_SKIP+\addskip, %rsp CFI_ADJUST_CFA_OFFSET -(ARG_SKIP+\addskip) @@ -176,33 +162,21 @@ For 32-bit we have the following conventions - kernel is built with .macro SAVE_REST subq $REST_SKIP, %rsp CFI_ADJUST_CFA_OFFSET REST_SKIP - movq %rbx, 5*8(%rsp) - CFI_REL_OFFSET rbx, 5*8 - movq %rbp, 4*8(%rsp) - CFI_REL_OFFSET rbp, 4*8 - movq %r12, 3*8(%rsp) - CFI_REL_OFFSET r12, 3*8 - movq %r13, 2*8(%rsp) - CFI_REL_OFFSET r13, 2*8 - movq %r14, 1*8(%rsp) - CFI_REL_OFFSET r14, 1*8 - movq %r15, (%rsp) - CFI_REL_OFFSET r15, 0*8 + movq_cfi rbx, 5*8 + movq_cfi rbp, 4*8 + movq_cfi r12, 3*8 + movq_cfi r13, 2*8 + movq_cfi r14, 1*8 + movq_cfi r15, 0*8 .endm .macro RESTORE_REST - movq (%rsp), %r15 - CFI_RESTORE r15 - movq 1*8(%rsp), %r14 - CFI_RESTORE r14 - movq 2*8(%rsp), %r13 - CFI_RESTORE r13 - movq 3*8(%rsp), %r12 - CFI_RESTORE r12 - movq 4*8(%rsp), %rbp - CFI_RESTORE rbp - movq 5*8(%rsp), %rbx - CFI_RESTORE rbx + movq_cfi_restore 0*8, r15 + movq_cfi_restore 1*8, r14 + movq_cfi_restore 2*8, r13 + movq_cfi_restore 3*8, r12 + movq_cfi_restore 4*8, rbp + movq_cfi_restore 5*8, rbx addq $REST_SKIP, %rsp CFI_ADJUST_CFA_OFFSET -(REST_SKIP) .endm @@ -214,9 +188,57 @@ For 32-bit we have the following conventions - kernel is built with .macro RESTORE_ALL addskip=0 RESTORE_REST - RESTORE_ARGS 0, \addskip + RESTORE_ARGS 1, \addskip .endm .macro icebp .byte 0xf1 .endm + +#else /* CONFIG_X86_64 */ + +/* + * For 32bit only simplified versions of SAVE_ALL/RESTORE_ALL. These + * are different from the entry_32.S versions in not changing the segment + * registers. So only suitable for in kernel use, not when transitioning + * from or to user space. The resulting stack frame is not a standard + * pt_regs frame. The main use case is calling C code from assembler + * when all the registers need to be preserved. + */ + + .macro SAVE_ALL + pushl_cfi %eax + CFI_REL_OFFSET eax, 0 + pushl_cfi %ebp + CFI_REL_OFFSET ebp, 0 + pushl_cfi %edi + CFI_REL_OFFSET edi, 0 + pushl_cfi %esi + CFI_REL_OFFSET esi, 0 + pushl_cfi %edx + CFI_REL_OFFSET edx, 0 + pushl_cfi %ecx + CFI_REL_OFFSET ecx, 0 + pushl_cfi %ebx + CFI_REL_OFFSET ebx, 0 + .endm + + .macro RESTORE_ALL + popl_cfi %ebx + CFI_RESTORE ebx + popl_cfi %ecx + CFI_RESTORE ecx + popl_cfi %edx + CFI_RESTORE edx + popl_cfi %esi + CFI_RESTORE esi + popl_cfi %edi + CFI_RESTORE edi + popl_cfi %ebp + CFI_RESTORE ebp + popl_cfi %eax + CFI_RESTORE eax + .endm + +#endif /* CONFIG_X86_64 */ + |