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Estimated hours taken: 1 runtime/machdeps/regtest.c: runtime/machdeps/regtest2.c: runtime/machdeps/doregtest: Add some more tests. runtime/machdeps/SPARC_REGS: Update the commentary here to reflect more a recent version of GNU C.
146 lines
4.7 KiB
Plaintext
146 lines
4.7 KiB
Plaintext
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This file contains the relevant part of config/sparc/sparc.h from the
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GNU C source code which describes how each register is used.
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#define REGISTER_NAMES \
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{"%g0", "%g1", "%g2", "%g3", "%g4", "%g5", "%g6", "%g7", \
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"%o0", "%o1", "%o2", "%o3", "%o4", "%o5", "%sp", "%o7", \
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"%l0", "%l1", "%l2", "%l3", "%l4", "%l5", "%l6", "%l7", \
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"%i0", "%i1", "%i2", "%i3", "%i4", "%i5", "%fp", "%i7", \
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"%f0", "%f1", "%f2", "%f3", "%f4", "%f5", "%f6", "%f7", \
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"%f8", "%f9", "%f10", "%f11", "%f12", "%f13", "%f14", "%f15", \
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"%f16", "%f17", "%f18", "%f19", "%f20", "%f21", "%f22", "%f23", \
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"%f24", "%f25", "%f26", "%f27", "%f28", "%f29", "%f30", "%f31"}
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/* 1 for registers that have pervasive standard uses
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and are not available for the register allocator.
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On non-v9 systems:
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g1 is free to use as temporary.
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g2-g4 are reserved for applications. Gcc normally uses them as
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temporaries, but this can be disabled via the -mno-app-regs option.
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g5 through g7 are reserved for the operating system.
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On v9 systems:
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g1,g5 are free to use as temporaries, and are free to use between calls
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if the call is to an external function via the PLT.
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g4 is free to use as a temporary in the non-embedded case.
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g4 is reserved in the embedded case.
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g2-g3 are reserved for applications. Gcc normally uses them as
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temporaries, but this can be disabled via the -mno-app-regs option.
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g6-g7 are reserved for the operating system (or application in
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embedded case).
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??? Register 1 is used as a temporary by the 64 bit sethi pattern, so must
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currently be a fixed register until this pattern is rewritten.
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Register 1 is also used when restoring call-preserved registers in large
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stack frames.
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Registers fixed in arch32 and not arch64 (or vice-versa) are marked in
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CONDITIONAL_REGISTER_USAGE in order to properly handle -ffixed-.
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*/
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#define FIXED_REGISTERS \
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{1, 0, 0, 0, 0, 0, 1, 1, \
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0, 0, 0, 0, 0, 0, 1, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 1, 1, \
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\
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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\
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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\
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0, 0, 0, 0, 0}
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/* 1 for registers not available across function calls.
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These must include the FIXED_REGISTERS and also any
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registers that can be used without being saved.
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The latter must include the registers where values are returned
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and the register where structure-value addresses are passed.
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Aside from that, you can include as many other registers as you like. */
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#define CALL_USED_REGISTERS \
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{1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 1, 1, \
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\
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1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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\
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1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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1, 1, 1, 1, 1, 1, 1, 1, \
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\
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1, 1, 1, 1, 1}
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/* If !TARGET_FPU, then make the fp registers and fp cc regs fixed so that
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they won't be allocated. */
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#define CONDITIONAL_REGISTER_USAGE \
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do \
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{ \
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if (TARGET_ARCH32) \
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{ \
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fixed_regs[5] = 1; \
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} \
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else \
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{ \
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fixed_regs[1] = 1; \
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} \
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if (! TARGET_V9) \
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{ \
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int regno; \
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for (regno = SPARC_FIRST_V9_FP_REG; \
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regno <= SPARC_LAST_V9_FP_REG; \
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regno++) \
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fixed_regs[regno] = 1; \
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/* %fcc0 is used by v8 and v9. */ \
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for (regno = SPARC_FIRST_V9_FCC_REG + 1; \
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regno <= SPARC_LAST_V9_FCC_REG; \
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regno++) \
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fixed_regs[regno] = 1; \
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} \
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if (! TARGET_FPU) \
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{ \
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int regno; \
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for (regno = 32; regno < SPARC_LAST_V9_FCC_REG; regno++) \
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fixed_regs[regno] = 1; \
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} \
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/* Don't unfix g2-g4 if they were fixed with -ffixed-. */ \
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fixed_regs[2] |= ! TARGET_APP_REGS; \
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fixed_regs[3] |= ! TARGET_APP_REGS; \
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fixed_regs[4] |= ! TARGET_APP_REGS || TARGET_CM_EMBMEDANY; \
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if (TARGET_FLAT) \
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{ \
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/* Let the compiler believe the frame pointer is still \
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%fp, but output it as %i7. */ \
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fixed_regs[31] = 1; \
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reg_names[FRAME_POINTER_REGNUM] = "%i7"; \
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/* ??? This is a hack to disable leaf functions. */ \
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global_regs[7] = 1; \
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} \
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if (profile_block_flag) \
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{ \
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/* %g1 and %g2 must be fixed, because BLOCK_PROFILER \
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uses them. */ \
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fixed_regs[1] = 1; \
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fixed_regs[2] = 1; \
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} \
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if (flag_pic != 0) \
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{ \
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fixed_regs[23] = 1; \
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call_used_regs[23] = 1; \
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} \
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} \
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while (0)
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